2010 Microchip Technology Inc. DS39975A
PIC24FJ256GB210 Family
Data Sheet
64/100-Pin,
16-Bit Flash Microcontrollers
with USB On-The-Go (OTG)
DS39975A-page 2 2010 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified
logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance,
TSHARC, UniWinDriver, WiperLock and ZENA are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2010, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-60932-209-0
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
2010 Microchip Technology Inc. DS39975A-page 3
PIC24FJ256GB210 FAMILY
Universal Serial Bus Features:
• USB v2.0 On-The-Go (OTG) Compliant
• Dual Role Capable – Can act as either Host or Peripheral
• Low-Speed (1.5 Mbps) and Full-Speed (12 Mbps)
USB Operation in Host mode
• Full-Speed USB Operation in Device mode
• High-Precision PLL for USB
• Supports up to 32 Endpoints (16 bidirectional):
- USB module can use the internal RAM location
from 0x800 to 0xFFFF as USB endpoint buffers
• On-Chip USB Transceiver with Interface for Off-Chip
Transceiver
• Supports Control, Interrupt, Isochronous and Bulk
Transfers
• On-Chip Pull-up and Pull-Down Resistors
Peripheral Features:
• Enhanced Parallel Master Port/Parallel Slave Port
(EPMP/PSP):
- Direct access from CPU with an Extended Data
Space (EDS) interface
- 4, 8 and 16-bit wide data bus
- Up to 23 programmable address lines
- Up to 2 chip select lines
- Up to 2 Acknowledgement lines (one per chip
select)
- Programmable address/data multiplexing
- Programmable address and data Wait states
- Programmable polarity on control signals
Peripheral Features (Continued):
• Peripheral Pin Select:
- Up to 44 available pins (100-pin devices)
• Three 3-Wire/4-Wire SPI modules (supports 4 Frame
modes)
•Three I
2C™ modules Supporting Multi-Master/Slave
modes and 7-Bit/10-Bit Addressing
•Four UART modules:
- Supports RS-485, RS-232, LIN/J2602 protocols
and IrDA®
• Five 16-Bit Timers/Counters with Programmable
Prescaler
• Nine 16-Bit Capture Inputs, each with a Dedicated Time
Base
• Nine 16-Bit Compare/PWM Outputs, each with a Dedi-
cated Time Base
• Hardware Real-Time Clock and Calendar (RTCC)
• Enhanced Programmable Cyclic Redundancy Check
(CRC) Generator
• Up to 5 External Interrupt Sources
PIC24FJ Device
Pins
Program Memory
(bytes)
SRAM (bytes)
Remappable Peripherals
I2C™
10-Bit A/D (ch)
Comparators
CTMU
EPMP/PSP
RTCC
USB OTG
Remappable
Pins
16-Bit Timers
IC/OC PWM
UART w/IrDA®
SPI
PIC24FJ128GB206 64 128K 96K 29 5 9/9 4 3 3 16 3 Y Y Y Y
PIC24FJ256GB206 64 256K 96K 29 5 9/9 4 3 3 16 3 Y Y Y Y
PIC24FJ128GB210 100/121 128K 96K 44 5 9/9 4 3 3 24 3 Y Y Y Y
PIC24FJ256GB210 100/121 256K 96K 44 5 9/9 4 3 3 24 3 Y Y Y Y
64/100-Pin, 16-Bit Flash Microcontrollers
with USB On-The-Go (OTG)
PIC24FJ256GB210 FAMILY
DS39975A-page 4 2010 Microchip Technology Inc.
High-Performance CPU
• Modified Harvard Architecture
• Up to 16 MIPS Operation at 32 MHz
• 8 MHz Internal Oscillator
• 17-Bit x 17-Bit Single-Cycle Hardware Multiplier
• 32-Bit by 16-Bit Hardware Divider
• 16 x 16-Bit Working Register Array
• C Compiler Optimized Instruction Set Architecture
with Flexible Addressing modes
• Linear Program Memory Addressing, up to
12 Mbytes
• Data Memory Addressing, up to 16 Mbytes:
- 2K SFR space
- 30K linear data memory
- 66K extended data memory
- Remaining (from 16 Mbytes) memory (external)
can be accessed using extended data Memory
(EDS) and EPMP (EDS is divided into 32-Kbyte
pages)
• Two Address Generation Units for Separate Read
and Write Addressing of Data Memory
Power Management:
• On-Chip Voltage Regulator of 1.8V
• Switch between Clock Sources in Real Time
• Idle, Sleep and Doze modes with Fast Wake-up and
Two-Speed Start-up
• Run Mode: 800 A/MIPS, 3.3V Typical
• Sleep mode Current Down to 20 A, 3.3V Typical
• Standby Current with 32 kHz Oscillator: 22 A, 3.3V
Typical
Analog Features:
• 10-Bit, up to 24-Channel Analog-to-Digital (A/D)
Converter at 500 ksps:
- Operation is possible in Sleep mode
- Band gap reference input feature
• Three Analog Comparators with Programmable
Input/Output Configuration
• Charge Time Measurement Unit (CTMU):
- Supports capacitive touch sensing for touch
screens and capacitive switches
- Minimum time measurement setting at 100 ps
• Available LVD Interrupt VLVD Level
Special Microcontroller Features:
• Operating Voltage Range of 2.2V to 3.6V
• 5.5V Tolerant Input (digital pins only)
• Configurable Open-Drain Outputs on Digital I/O
Ports
• High-Current Sink/Source (18 mA/18 mA) on all
I/O Ports
• Selectable Power Management modes:
- Sleep, Idle and Doze modes with fast wake-up
• Fail-Safe Clock Monitor (FSCM) Operation:
- Detects clock failure and switches to on-chip,
FRC oscillator
• On-Chip LDO Regulator
• Power-on Reset (POR) and
Oscillator Start-up Timer (OST)
• Brown-out Reset (BOR)
• Flexible Watchdog Timer (WDT) with On-Chip
Low-Power RC Oscillator for Reliable Operation
• In-Circuit Serial Programming™ (ICSP™) and
In-Circuit Debug (ICD) via 2 Pins
• JTAG Boundary Scan Support
• Flash Program Memory:
- 10,000 erase/write cycle endurance (minimum)
- 20-year data retention minimum
- Selectable write protection boundary
- Self-reprogrammable under software control
- Write protection option for Configuration Words
2010 Microchip Technology Inc. DS39975A-page 5
PIC24FJ256GB210 FAMILY
Pin Diagram (64-Pin TQFP/QFN)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
48
47
22
44
24
25
26
27
28
29
30
31
32
1
46
45
23
43
42
41
40
39
C3INB/CN15/RD6
RP20
/PMRD/CN14/RD5
RP25
/PMWR/CN13/RD4
RP22
/PMBE0/CN52/RD3
DPH/
RP23
/PMACK1/CN51/RD2
V
CPCON
/
RP24
/V
BUSCHG
/CN50/RD1
PMD4/CN62/RE4
PMD3/CN61/RE3
PMD2/CN60/RE2
PMD1/CN59/RE1
V
BUSST
/V
CMPST
1/V
BUSVLD
/CN68/RF0
V
CAP
SOSCI/C3IND/CN1/RC13
DMH/
RP11
/INT0/CN49/RD0
SCL1/
RP3
/PMA15/PMCS2/CN55/RD10
DPLN/SDA1/
RP4
/PMA14/PMCS1/CN54/RD9
RTCC/DMLN/
RP2
/CN53/RD8
RP12
/PMACK2/CN56/RD11
OSCO/CLKO/CN22/RC15
OSCI/CLKI/CN23/RC12
VDD
D+/CN83/RG2
VUSB
V
BUS
/RF7
RP16
/USBID/CN71/RF3
D-/CN84/RG3
AV
DD
AN8/
RP8
/CN26/RB8
AN9/
RP9
/PMA7/CN27/RB9
TMS/CV
REF
/AN10/PMA13/CN28/RB10
TDO/AN11/PMA12/CN29/RB11
V
DD
PGEC2/AN6/
RP6
/CN24/RB6
PGED2/AN7/
RP7
/RCV/CN25/RB7
SCL2/
RP17
/PMA8/CN18/RF5
SDA2/
RP10
/PMA9/CN17/RF4
PMD5/CN63/RE5
SCL3/PMD6/CN64/RE6
SDA3/PMD7/CN65/RE7
C1IND/
RP21
/PMA5/CN8/RG6
VDD
PGEC3/AN5/C1INA/V
BUSON
/
RP18
/CN7/RB5
PGED3/AN4/C1INB/USBOEN/
RP28
/CN6/RB4
AN3/C2INA/VPIO/CN5/RB3
AN2/C2INB/VMIO/
RP13
/CN4/RB2
C1INC/
RP26
/PMA4/CN9/RG7
C2IND/
RP19
/PMA3/CN10/RG8
PGEC1/AN1/V
REF
-/
RP1
/CN3/RB1
PGED1/AN0/V
REF
+/PMA6/
RP0
/CN2/RB0
C2INC/
RP27
/PMA2/CN11/RG9
MCLR
TCK/AN12/CTEDG2/PMA11/CN30/RB12
TDI/AN13CTEDG1/PMA10/CN31/RB13
AN14/CTPLS/
RP14
/PMA1/CN32/RB14
AN15/
RP29
/REFO/PMA0/CN12/RB15
PMD0/CN58/RE0
V
CMPST
2/SESSVLD/CN69/RF1
C3INA/SESSEND/CN16/RD7
VSS(1)
V
SS
(1)
VSS(1)
ENVREG
63
62
61
59
60
58
57
56
54
55
53
52
51
49
50
38
37
34
36
35
33
17
19
20
21
18
AV
SS
64
SOSCO/SCLKI/T1CK/C3INC/
RPI37
/CN0/
Note 1: The back pad on QFN devices should be connected to VSS.
Legend: RPn and RPIn represents remappable peripheral pins.
Shaded pins indicate pins that are tolerant to up to +5.5V.
PIC24FJXXXGB206
RC14
PIC24FJ256GB210 FAMILY
DS39975A-page 6 2010 Microchip Technology Inc.
TABLE 1: COMPLETE PIN FUNCTION DESCRIPTIONS FOR 64-PIN DEVICES
Pin Function Pin Function
1 PMD5/CN63/RE5 33 RP16/USBID/CN71/RF3
2 SCL3/PMD6/CN64/RE6 34 VBUS/RF7
3 SDA3/PMD7/CN65/RE7 35 VUSB
4C1IND/RP21/PMA5/CN8/RG6 36 D-/CN84/RG3
5C1INC/RP26/PMA4/CN9/RG7 37 D+/CN83/RG2
6C2IND/RP19/PMA3/CN10/RG8 38 VDD
7MCLR 39 OSCI/CLKI/CN23/RC12
8C2INC/RP27/PMA2/CN11/RG9 40 OSCO/CLKO/CN22/RC15
9VSS 41 VSS
10 VDD 42 RTCC/DMLN/RP2/CN53/RD8
11 PGEC3/AN5/C1INA/VBUSON/RP18/CN7/RB5 43 DPLN/SDA1/RP4/PMACK2/CN54/RD9
12 PGED3/AN4/C1INB/USBOEN/RP28/CN6/RB4 44 SCL1/RP3/PMA15/PMCS2(1)/CN55/RD10
13 AN3/C2INA/VPIO/CN5/RB3 45 RP12/PMA14/PMCS1(1)/CN56/RD11
14 AN2/C2INB/VMIO/RP13/CN4/RB2 46 DMH/RP11/INT0/CN49/RD0
15 PGEC1/AN1/VREF-/RP1/CN3/RB1 47 SOSCI/C3IND/CN1/RC13
16 PGED1/AN0/VREF+/PMA6/RP0/CN2/RB0 48 SOSCO/SCLKI/T1CK/C3INC/RPI37/CN0/RC14
17 PGEC2/AN6/RP6/CN24/RB6 49 VCPCON/RP24/VBUSCHG/CN50/RD1
18 PGED2/AN7/RP7/RCV/CN25/RB7 50 DPH/RP23/PMACK1/CN51/RD2
19 AVDD 51 RP22/PMBE0/CN52/RD3
20 AVSS 52 RP25/PMWR/CN13/RD4
21 AN8/RP8/CN26/RB8 53 RP20/PMRD/CN14/RD5
22 AN9/RP9/PMA7/CN27/RB9 54 C3INB/CN15/RD6
23 TMS/CVREF/AN10/PMA13/CN28/RB10 55 C3INA/SESSEND/CN16/RD7
24 TDO/AN11/PMA12/CN29/RB11 56 VCAP
25 VSS 57 ENVREG
26 VDD 58 VBUSST/VCMPST1/VBUSVLD/CN68/RF0
27 TCK/AN12/CTEDG2/PMA11/CN30/RB12 59 VCMPST2/SESSVLD/CN69/RF1
28 TDI/AN13/CTEDG1/PMA10/CN31/RB13 60 PMD0/CN58/RE0
29 AN14/CTPLS/RP14/PMA1/CN32/RB14 61 PMD1/CN59/RE1
30 AN15/RP29/REFO/PMA0/CN12/RB15 62 PMD2/CN60/RE2
31 SDA2/RP10/PMA9/CN17/RF4 63 PMD3/CN61/RE3
32 SCL2/RP17/PMA8/CN18/RF5 64 PMD4/CN62/RE4
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
Note 1: Pin assignment for PMCSx when CSF<1:0> are not equal to ‘00’.
2010 Microchip Technology Inc. DS39975A-page 7
PIC24FJ256GB210 FAMILY
Pin Diagram (100-Pin TQFP)
92
94
93
91
90
89
88
87
86
85
84
83
82
81
80
79
78
20
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
65
64
63
62
61
60
59
26
56
45
44
43
42
41
40
39
28
29
30
31
32
33
34
35
36
37
38
17
18
19
21
22
95
1
76
77
72
71
70
69
68
67
66
75
74
73
58
57
24
23
25
96
98
97
99
27
46
47
48
49
50
55
54
53
52
51
100
RP20
/PMRD/CN14/RD5
RP25
/PMWR/CN13/RD4
PMD13/CN19/RD13
RPI42
/PMD12/CN57/RD12
RP22
/PMBE0/CN52/RD3
DPH/
RP23
/PMACK1/CN51/RD2
V
CPCON
/
RP24
/V
BUSCHG
/CN50/RD1
AN22/PMA17/CN40/RA7
AN23/CN39/RA6
PMD2/CN60/RE2
CN80/RG13
CN79/RG12
PMA16/CN81/RG14
PMD1/CN59/RE1
PMD0/CN58/RE0
PMD8/CN77/RG0
PMD4/CN62/RE4
PMD3/CN61/RE3
V
BUSST
/V
CMPST
1/V
BUSVLD
/PMD11/CN68/RF0
V
CAP
SOSCI/C3IND/CN1/RC13
DMH/
RP11
/INT0/CN49/RD0
RP3
/PMA15/PMCS2
/
CN55/
DPLN/
RP4
/PMACK2/CN54/
DMLN/RTCC/
RP2
/CN53/RD8
RP12/
PMA14/PMCS1
/
CN56/RD11
SDA1/
RPI35
/PMBE1/CN44/
SCL1/
RPI36
/
OSCO/CLKO/CN22/RC15
OSCI/CLKI/CN23/RC12
V
DD
D+/CN83/RG2
V
USB
V
BUS
/CN73/RF7
RP15
/CN74/RF8
D-/CN84/RG3
RP30
/CN70/RF2
RP16
/USBID/CN71/RF3
V
SS
V
REF
+/PMA6/CN42/RA10
V
REF
-/PMA7/CN41/RA9
AV
DD
AV
SS
AN8/
RP8
/CN26/RB8
AN9/
RP9
/CN27/RB9
AN10/CV
REF
/PMA13/CN28/RB10
AN11/PMA12/CN29/RB11
V
DD
RPI32
/PMA18/PMA5
/
CN75/RF12
RP31
/CN76/RF13
V
SS
V
DD
RP5
/CN21/RD15
RPI43
/CN20/RD14
PGEC2/AN6/
RP6
/CN24/RB6
PGED2/AN7/
RP7
/RCV/CN25/RB7
RP17
/PMA8/CN18/RF5
RP10
/PMA9/CN17/RF4
PMD5/CN63/RE5
SCL3/PMD6/CN64/RE6
SDA3/PMD7/CN65/RE7
RPI38
/CN45/RC1
RPI39
/CN46/RC2
RPI40
/CN47/RC3
AN16/
RPI41
/PMCS2/PMA22
/
CN48/RC4
AN17/C1IND/
RP21
/PMA5/PMA18
/
CN8/
V
DD
TMS/CN33/RA0
RPI33
/PMCS1/CN66/RE8
AN21/
RPI34
/PMA19/CN67/RE9
PGEC3/AN5/C1INA/V
BUSON
/
RP18
/CN7/RB5
AN3/C2INA/VPIO/CN5/RB3
AN2/C2INB/VMIO/
RP13
/CN4/RB2
RG6
AN19/C2IND/
RP19
/PMA3/PMA21
/
CN10/RG8
PGEC1/AN1/V
REF
-/
RP1
/CN3/RB1
PGED1/AN0/V
REF
+
/RP0
/CN2/RB0
CN82/RG15
V
DD
AN20/C2INC/
RP27
/PMA2/CN11/RG9
MCLR
AN12/PMA11/CTEDG2/CN30/RB12
AN13/PMA10/CTEDG1/CN31/RB13
AN14/CTPLS/
RP14
/PMA1/CN32/RB14
AN15/REFO/
RP29
/PMA0/CN12/RB15
PMD9/CN78/RG1
V
CMPST
2/SESSVLD/PMD10/CN69/RF1
C3INA/SESSEND/PMD15/CN16/RD7
C3INB/PMD14/CN15/RD6
TDO/CN38/RA5
SDA2/PMA20/PMA4
/
CN36/RA3
SCL2/CN35/RA2
V
SS
V
SS
V
SS
ENVREG
TDI/PMA21/PMA3/CN37/RA4
TCK/CN34/RA1
SOSCO/SCLKI/TICK/C3INC/
PGED3/AN4/C1INB/USBOEN/
RP28
/CN6/RB4
Legend: RPn and RPIn represent remappable peripheral pins.
Shaded pins indicate pins that are tolerant to up to +5.5V.
AN18/C1INC/
RP26
/PMA4/PMA20
/
CN9/RG7
CN43/RA14
PMA22/PMCS2
/
RA15
RD9
RPI37
/CN0/RC14
PIC24FJXXXGB210
RD10
PIC24FJ256GB210 FAMILY
DS39975A-page 8 2010 Microchip Technology Inc.
TABLE 2: COMPLETE PIN FUNCTION DESCRIPTIONS FOR 100-PIN DEVICES
PinFunctionPinFunction
1 CN82/RG15 41 AN12/PMA11/CTEDG2/CN30/RB12
2V
DD 42 AN13/PMA10/CTEDG1/CN31/RB13
3 PMD5/CN63/RE5 43 AN14/CTPLS/RP14/PMA1/CN32/RB14
4 SCL3/PMD6/CN64/RE6 44 AN15/REFO/RP29/PMA0/CN12/RB15
5 SDA3/PMD7/CN65/RE7 45 VSS
6RPI38/CN45/RC1 46 VDD
7RPI39/CN46/RC2 47 RPI43/CN20/RD14
8RPI40/CN47/RC3 48 RP5/CN21/RD15
9 AN16/RPI41/PMCS2/PMA22(2)/CN48/RC4 49 RP10/PMA9/CN17/RF4
10 AN17/C1IND/RP21/PMA5/PMA18(2)/CN8/RG6 50 RP17/PMA8/CN18/RF5
11 AN18/C1INC/RP26/PMA4/PMA20(2)/CN9/RG7 51 RP16/USBID/CN71/RF3
12 AN19/C2IND/RP19/PMA3/PMA21(2)/CN10/RG8 52 RP30/CN70/RF2
13 MCLR 53 RP15/CN74/RF8
14 AN20/C2INC/RP27/PMA2/CN11/RG9 54 VBUS/CN73/RF7
15 VSS 55 VUSB
16 VDD 56 D-/CN84/RG3
17 TMS/CN33/RA0 57 D+/CN83/RG2
18 RPI33/PMCS1/CN66/RE8 58 SCL2/CN35/RA2
19 AN21/RPI34/PMA19/CN67/RE9 59 SDA2/PMA20/PMA4(2)/CN36/RA3
20 PGEC3/AN5/C1INA/VBUSON/RP18/CN7/RB5 60 TDI/PMA21/PMA3(2)/CN37/RA4
21 PGED3/AN4/C1INB/USBOEN/RP28/CN6/RB4 61 TDO/CN38/RA5
22 AN3/C2INA/VPIO/CN5/RB3 62 VDD
23 AN2/C2INB/VMIO/RP13/CN4/RB2 63 OSCI/CLKI/CN23/RC12
24 PGEC1/AN1/VREF-(1)/RP1/CN3/RB1 64 OSCO/CLKO/CN22/RC15
25 PGED1/AN0/VREF+(1)/RP0/CN2/RB0 65 VSS
26 PGEC2/AN6/RP6/CN24/RB6 66 SCL1/RPI36/PMA22/PMCS2(2)/CN43/RA14
27 PGED2/AN7/RP7/RCV/CN25/RB7 67 SDA1/RPI35/PMBE1/CN44/RA15
28 VREF-/PMA7/CN41/RA9 68 DMLN/RTCC/RP2/CN53/RD8
29 VREF+/PMA6/CN42/RA10 69 DPLN/RP4/PMACK2/CN54/RD9
30 AVDD 70 RP3/PMA15/PMCS2(3)/CN55/RD10
31 AVSS 71 RP12/PMA14/PMCS1(3)/CN56/RD11
32 AN8/RP8/CN26/RB8 72 DMH/RP11/INT0/CN49/RD0
33 AN9/RP9/CN27/RB9 73 SOSCI/C3IND/CN1/RC13
34 AN10/CVREF/PMA13/CN28/RB10 74 SOSCO/SCLKI/T1CK/C3INC/RPI37/CN0/RC14
35 AN11/PMA12/CN29/RB11 75 VSS
36 VSS 76 VCPCON/RP24/VBUSCHG/CN50/RD1
37 VDD 77 DPH/RP23/PMACK1/CN51/RD2
38 TCK/CN34/RA1 78 RP22/PMBE0/CN52/RD3
39 RP31/CN76/RF13 79 RPI42/PMD12/CN57/RD12
40 RPI32/PMA18/PMA5(2)/CN75/RF12 80 PMD13/CN19/RD13
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select (PPS) functions.
Note 1: Alternate pin assignments for VREF+ and VREF- when the ALTVREF Configuration bit is programmed.
2: Alternate pin assignments for EPMP when the ALTPMP Configuration bit is programmed (only in 100-pin devices).
3: Pin assignment for PMCSx when CSF<1:0> is not equal to ‘00’.
2010 Microchip Technology Inc. DS39975A-page 9
PIC24FJ256GB210 FAMILY
81 RP25/PMWR/CN13/RD4 91 AN23/CN39/RA6
82 RP20/PMRD/CN14/RD5 92 AN22/PMA17/CN40/RA7
83 C3INB/PMD14/CN15/RD6 93 PMD0/CN58/RE0
84 C3INA/SESSEND/PMD15/CN16/RD7 94 PMD1/CN59/RE1
85 VCAP 95 PMA16/CN81/RG14
86 ENVREG 96 CN79/RG12
87 VBUSST/VCMPST1/VBUSVLD/PMD11/CN68/RF0 97 CN80/RG13
88 VCMPST2/SESSVLD/PMD10/CN69/RF1 98 PMD2/CN60/RE2
89 PMD9/CN78/RG1 99 PMD3/CN61/RE3
90 PMD8/CN77/RG0 100 PMD4/CN62/RE4
TABLE 2: COMPLETE PIN FUNCTION DESCRIPTIONS FOR 100-PIN DEVICES (CONTINUED)
PinFunctionPinFunction
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select (PPS) functions.
Note 1: Alternate pin assignments for VREF+ and VREF- when the ALTVREF Configuration bit is programmed.
2: Alternate pin assignments for EPMP when the ALTPMP Configuration bit is programmed (only in 100-pin devices).
3: Pin assignment for PMCSx when CSF<1:0> is not equal to ‘00’.
PIC24FJ256GB210 FAMILY
DS39975A-page 10 2010 Microchip Technology Inc.
Pin Diagram – Top View (121-Pin BGA)(1)
135 10 11
ARE4 RE3 RG13 RE0 RG0 RF1 ENVREG N/C RD12 RD2 RD1
BN/C RG15 RE2 RE1 RA7 RF0 VCAP RD5 RD3 VSS RC14
CRE6 VDD RG12 RG14 RA6 N/C RD7 RD4 VDD RC13 RD11
DRC1 RE7 RE5 VSS VSS N/C RD6 RD13 RD0 n/c RD10
ERC4 RC3 RG6 RC2 VDD RG1 N/C RA15 RD8 RD9 RA14
FMCLR RG8 RG9 RG7 VSS n/c N/C VDD OSCI/ VSS OSCO/
GRE8 RE9 RA0 N/C VDD VSS VSS N/C RA5 RA3 RA4
HPGEC3/ PGED3/ VSS VDD N/C VDD n/c VBUS/RF7 VUSB D+/RG2 RA2
JRB3 RB2 PGED2/RB7 AVDD RB11 RA1 RB12 N/C N/C RF8 D-/RG3
KPGEC1/ PGED1/ RA10 RB8 N/C RF12 RB14 VDD RD15 USBID/ RF2
LPGEC2/ RA9 AVSS RB9 RB10RF13RB13
RB15 RD14 RF4 RF5
24 6
Note 1: See Table 3 for complete functional pinout descriptions.
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
Shaded pins indicate pins tolerant to up to +5.5V.
RC12 RC15
RF3
RB5 RB4
RB1 RB0
RB6
9
8
7
2010 Microchip Technology Inc. DS39975A-page 11
PIC24FJ256GB210 FAMILY
TABLE 3: COMPLETE PIN FUNCTION DESCRIPTIONS FOR 121-PIN (BGA) DEVICES
PinFunctionPinFunction
A1 PMD4/CN62/RE4 E5 VDD
A2 PMD3/CN61/RE3 E6 PMD9/CN78/RG1
A3 CN80/RG13 E7 N/C
A4 PMD0/CN58/RE0 E8 SDA1/RPI35/PMBE1/CN44/RA15
A5 PMD8/CN77/RG0 E9 DMLN/RTCC/RP2/CN53/RD8
A6 VCMPST2/SESSVLD/PMD10/CN69/RF1 E10 DPLN/RP4/PMACK2/CN54/RD9
A7 ENVREG E11 SCL1/RPI36/PMA22/PMCS2(2)/CN43/RA14
A8 N/C F1 MCLR
A9 RPI42/PMD12/CN57/RD12 F2 AN19/C2IND/RP19/PMA3/PMA21(2)/CN10/RG8
A10 DPH/RP23/PMACK1/CN51/RD2 F3 AN20/C2INC/RP27/PMA2/CN11/RG9
A11 VCPCON/RP24/VBUSCHG/CN50/RD1 F4 AN18/C1INC/RP26/PMA4/PMA20(2)/CN9/RG7
B1 N/C F5 VSS
B2 CN82/RG15 F6 N/C
B3 PMD2/CN60/RE2 F7 N/C
B4 PMD1/CN59/RE1 F8 VDD
B5 AN22/PMA17/CN40/RA7 F9 OSCI/CLKI/CN23/RC12
B6 VBUSST/VCMPST1/VBUSVLD/PMD11/CN68/RF0 F10 VSS
B7 VCAP F11 OSCO/CLKO/CN22/RC15
B8 RP20/PMRD/CN14/RD5 G1 RPI33/PMCS1/CN66/RE8
B9 RP22/PMBE0/CN52/RD3 G2 AN21/RPI34/PMA19/CN67/RE9
B10 VSS G3 TMS/CN33/RA0
B11 SOSCO/SCLKI/T1CK/C3INC/RPI37/CN0/RC14 G4 N/C
C1 SCL3/PMD6/CN64/RE6 G5 VDD
C2 VDD G6 VSS
C3 VSYNC/CN79/RG12 G7 VSS
C4 PMA16/CN81/RG14 G8 N/C
C5 AN23/CN39/RA6 G9 TDO/CN38/RA5
C6 N/C G10 SDA2/PMA20/PMA4(2)/CN36/RA3
C7 C3INA/SESSEND/PMD15/CN16/RD7 G11 TDI/PMA21/PMA3(2)/CN37/RA4
C8 RP25/PMWR/CN13/RD4 H1 PGEC3/AN5/C1INA/VBUSON/RP18/CN7/RB5
C9 VDD H2 PGED3/AN4/C1INB/USBOEN/RP28/CN6/RB4
C10 SOSCI/C3IND/CN1/RC13 H3 VSS
C11 RP12/PMA14/PMCS1(3)/CN56/RD11 H4 VDD
D1 RPI38/CN45/RC1 H5 N/C
D2 SDA3/PMD7/CN65/RE7 H6 VDD
D3 PMD5/CN63/RE5 H7 N/C
D4 VSS H8 VBUS/CN73/RF7
D5 VSS H9 VUSB
D6 N/C H10 D+/CN83/RG2
D7 C3INB/PMD14/CN15/RD6 H11 SCL2/CN35/RA2
D8 PMD13/CN19/RD13 J1 AN3/C2INA/VPIO/CN5/RB3
D9 DMH/RP11/INT0/CN49/RD0 J2 AN2/C2INB/VMIO/RP13/CN4/RB2
D10 N/C J3 PGED2/AN7/RP7/RCV/CN25/RB7
D11 RP3/PMA15/PMCS2(3)/CN55/RD10 J4 AVDD
E1 AN16/RPI41/PMCS2/PMA22(2)/CN48/RC4 J5 AN11/PMA12/CN29/RB11
E2 RPI40/CN47/RC3 J6 TCK/CN34/RA1
E3 AN17/C1IND/RP21/PMA5/PMA18(2)/CN8/RG6 J7 AN12/PMA11/CTEDG2/CN30/RB12
E4 RPI39/CN46/RC2 J8 N/C
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
Note 1: Alternate pin assignments for VREF+ and VREF- when the ALTVREF Configuration bit is programmed.
2: Alternate pin assignments for EPMP when the ALTPMP Configuration bit is programmed (only in 100-pin devices).
3: Pin assignment for PMCSx when CSF<1:0> is not equal to ‘00’.
PIC24FJ256GB210 FAMILY
DS39975A-page 12 2010 Microchip Technology Inc.
J9 N/C L1 PGEC2/AN6/RP6/CN24/RB6
J10 RP15/CN74/RF8 L2 VREF-(1)/PMA7/CN41/RA9
J11 D-/CN84/RG3 L3 AVSS
K1 PGEC1/AN1/VREF-(1)/RP1/CN3/RB1 L4 AN9/RP9/CN27/RB9
K2 PGED1/AN0/VREF+(1)/RP0/CN2/RB0 L5 AN10/CVREF/PMA13/CN28/RB10
K3 VREF+(1)/PMA6/CN42/RA10 L6 RP31/CN76/RF13
K4 AN8/RP8/CN26/RB8 L7 AN13/PMA10/CTEDG1/CN31/RB13
K5 N/C L8 AN15/REFO/RP29/PMA0/CN12/RB15
K6 RPI32/PMA18/PMA5(2)/CN75/RF12 L9 RPI43/CN20/RD14
K7 AN14/CTPLS/RP14/PMA1/CN32/RB14 L10 RP10/PMA9/CN17/RF4
K8 VDD L11 RP17/PMA8/SCL2/CN18/RF5
K9 RP5/CN21/RD15 — —
K10 RP16/USBID/CN71/RF3 — —
K11 RP30/CN70/RF2 — —
TABLE 3: COMPLETE PIN FUNCTION DESCRIPTIONS FOR 121-PIN (BGA) DEVICES (CONTINUED)
PinFunctionPinFunction
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
Note 1: Alternate pin assignments for VREF+ and VREF- when the ALTVREF Configuration bit is programmed.
2: Alternate pin assignments for EPMP when the ALTPMP Configuration bit is programmed (only in 100-pin devices).
3: Pin assignment for PMCSx when CSF<1:0> is not equal to ‘00’.
2010 Microchip Technology Inc. DS39975A-page 13
PIC24FJ256GB210 FAMILY
Table of Contents
1.0 Device Overview ........................................................................................................................................................................ 15
2.0 Guidelines for Getting Started with 16-Bit Microcontrollers........................................................................................................ 31
3.0 CPU ........................................................................................................................................................................................... 37
4.0 Memory Organization ................................................................................................................................................................. 43
5.0 Flash Program Memory.............................................................................................................................................................. 79
6.0 Resets ........................................................................................................................................................................................ 85
7.0 Interrupt Controller ..................................................................................................................................................................... 91
8.0 Oscillator Configuration ............................................................................................................................................................ 137
9.0 Power-Saving Features............................................................................................................................................................ 149
10.0 I/O Ports ................................................................................................................................................................................... 151
11.0 Timer1 ...................................................................................................................................................................................... 183
12.0 Timer2/3 and Timer4/5 ............................................................................................................................................................ 185
13.0 Input Capture with Dedicated Timers ....................................................................................................................................... 191
14.0 Output Compare with Dedicated Timers .................................................................................................................................. 195
15.0 Serial Peripheral Interface (SPI)............................................................................................................................................... 205
16.0 Inter-Integrated Circuit™ (I2C™).............................................................................................................................................. 217
17.0 Universal Asynchronous Receiver Transmitter (UART) ........................................................................................................... 225
18.0 Universal Serial Bus with On-The-Go Support (USB OTG) ..................................................................................................... 233
19.0 Enhanced Parallel Master Port (EPMP) ................................................................................................................................... 269
20.0 Real-Time Clock and Calendar (RTCC) .................................................................................................................................. 281
21.0 32-Bit Programmable Cyclic Redundancy Check (CRC) Generator ........................................................................................ 293
22.0 10-Bit High-Speed A/D Converter ............................................................................................................................................ 301
23.0 Triple Comparator Module........................................................................................................................................................ 311
24.0 Comparator Voltage Reference................................................................................................................................................ 317
25.0 Charge Time Measurement Unit (CTMU) ................................................................................................................................ 319
26.0 Special Features ...................................................................................................................................................................... 323
27.0 Development Support............................................................................................................................................................... 335
28.0 Instruction Set Summary.......................................................................................................................................................... 339
29.0 Electrical Characteristics .......................................................................................................................................................... 347
30.0 Packaging Information.............................................................................................................................................................. 363
Appendix A: Revision History............................................................................................................................................................. 375
Index ................................................................................................................................................................................................. 377
The Microchip Web Site..................................................................................................................................................................... 383
Customer Change Notification Service .............................................................................................................................................. 383
Customer Support .............................................................................................................................................................................. 383
Reader Response .............................................................................................................................................................................. 384
Product Identification System ............................................................................................................................................................ 385
PIC24FJ256GB210 FAMILY
DS39975A-page 14 2010 Microchip Technology Inc.
TO OUR VALUED CUSTOMERS
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When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
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2010 Microchip Technology Inc. DS39975A-page 15
PIC24FJ256GB210 FAMILY
1.0 DEVICE OVERVIEW
This document contains device-specific information for
the following devices:
The PIC24FJ256GB210 family enhances on the
existing line of Microchip‘s 16-bit microcontrollers,
adding a large data RAM, up to 96 Kbytes. The
PIC24FJ256GB210 family allows the CPU to fetch data
directly from an external memory device using the
EPMP module.
1.1 Core Features
1.1.1 16-BIT ARCHITECTURE
Central to all PIC24F devices is the 16-bit modified
Harvard architecture, first introduced with Microchip’s
dsPIC® Digital Signal Controllers (DSCs). The PIC24F
CPU core offers a wide range of enhancements, such as:
• 16-bit data and 24-bit address paths with the
ability to move information between data and
memory spaces
• Linear addressing of up to 12 Mbytes (program
space) and 32 Kbytes (data)
• A 16-element working register array with built-in
software stack support
• A 17 x 17 hardware multiplier with support for
integer math
• Hardware support for 32 by 16-bit division
• An instruction set that supports multiple
addressing modes and is optimized for high-level
languages, such as ‘C’
• Operational performance up to 16 MIPS
1.1.2 POWER-SAVING TECHNOLOGY
All of the devices in the PIC24FJ256GB210 family
incorporate a range of features that can significantly
reduce power consumption during operation. Key
items include:
•On-the-Fly Clock Switching: The device clock
can be changed under software control to the
Timer1 source or the internal, low-power RC
oscillator during operation, allowing the user to
incorporate power-saving ideas into their software
designs.
•Doze Mode Operation: When timing-sensitive
applications, such as serial communications,
require the uninterrupted operation of peripherals,
the CPU clock speed can be selectively reduced,
allowing incremental power savings without
missing a beat.
•Instruction-Based Power-Saving Modes: The
microcontroller can suspend all operations, or
selectively shut down its core while leaving its
peripherals active with a single instruction in
software.
1.1.3 OSCILLATOR OPTIONS AND
FEATURES
All of the devices in the PIC24FJ256GB210 family offer
five different oscillator options, allowing users a range
of choices in developing application hardware. These
include:
• Two Crystal modes using crystals or ceramic
resonators.
• Two External Clock modes offering the option of a
divide-by-2 clock output.
• A Fast Internal Oscillator (FRC) with a nominal
8 MHz output, which can also be divided under
software control to provide clock speeds as low as
31 kHz.
• A Phase Lock Loop (PLL) frequency multiplier,
available to the external oscillator modes and the
FRC oscillator, which allows clock speeds of up to
32 MHz.
• A separate Low-Power Internal RC Oscillator
(LPRC) with a fixed 31 kHz output, which provides
a low-power option for timing-insensitive
applications.
The internal oscillator block also provides a stable
reference source for the Fail-Safe Clock Monitor
(FSCM). This option constantly monitors the main clock
source against a reference signal provided by the inter-
nal oscillator and enables the controller to switch to the
internal oscillator, allowing for continued low-speed
operation or a safe application shutdown.
1.1.4 EASY MIGRATION
Regardless of the memory size, all devices share the
same rich set of peripherals, allowing for a smooth
migration path as applications grow and evolve. The
consistent pinout scheme used throughout the entire
family also aids in migrating from one device to the next
larger, or even in jumping from 64-pin to 100-pin
devices.
The PIC24F family is pin compatible with devices in the
dsPIC33 family, and shares some compatibility with the
pinout schema for PIC18 and dsPIC30. This extends
the ability of applications to grow from the relatively
simple, to the powerful and complex, yet still selecting
a Microchip device.
• PIC24FJ128GB206
• PIC24FJ256GB206
• PIC24FJ128GB210
• PIC24FJ256GB210
PIC24FJ256GB210 FAMILY
DS39975A-page 16 2010 Microchip Technology Inc.
1.2 USB On-The-Go
The USB On-The-Go (USB OTG) module provides
on-chip functionality as a target device, compatible with
the USB 2.0 standard, as well as limited stand-alone
functionality as a USB embedded host. By implement-
ing USB Host Negotiation Protocol (HNP), the module
can also dynamically switch between device and host
operation, allowing for a much wider range of versatile
USB enabled applications on a microcontroller
platform.
In addition to USB host functionality,
PIC24FJ256GB210 family devices provide a true
single chip USB solution, including an on-chip
transceiver and voltage regulator, and a voltage boost
generator for sourcing bus power during host
operations.
1.3 Other Special Features
•Peripheral Pin Select: The Peripheral Pin Select
(PPS) feature allows most digital peripherals to be
mapped over a fixed set of digital I/O pins. Users
may independently map the input and/or output of
any one of the many digital peripherals to any one
of the I/O pins.
•Communications: The PIC24FJ256GB210 family
incorporates a range of serial communication
peripherals to handle a range of application
requirements. There are three independent I2C™
modules that support both Master and Slave
modes of operation. Devices also have, through
the PPS feature, four independent UARTs with
built-in IrDA® encoders/decoders and three SPI
modules.
•Analog Features: All members of the
PIC24FJ256GB210 family include a 10-bit A/D
Converter (ADC) module and a triple comparator
module. The ADC module incorporates program-
mable acquisition time, allowing for a channel to
be selected and a conversion to be initiated
without waiting for a sampling period, and faster
sampling speeds. The comparator module
includes three analog comparators that are
configurable for a wide range of operations.
•CTMU Interface: In addition to their other analog
features, members of the PIC24FJ256GB210
family include the CTMU interface module. This
provides a convenient method for precision time
measurement and pulse generation, and can
serve as an interface for capacitive sensors.
•Enhanced Parallel Master/Parallel Slave Port:
There are general purpose I/O ports, which can
be configured for parallel data communications. In
this mode, the device can be master or slave on
the communication bus. 4-bit, 8-bit and 16-bit data
transfers, with up to 23 external address lines, are
supported in Master modes.
•Real-Time Clock and Calendar: (RTCC) This
module implements a full-featured clock and
calendar with alarm functions in hardware, freeing
up timer resources and program memory space
for use of the core application.
1.4 Details on Individual Family
Members
Devices in the PIC24FJ256GB210 family are available
in 64-pin and 100-pin packages. The general block
diagram for all devices is shown in Figure 1-1.
The devices are differentiated from each other in seven
ways:
1. Flash program memory (128 Kbytes for
PIC24FJ128GB2XX devices and 256 Kbytes
for PIC24FJ256GB2XX devices).
2. Available I/O pins and ports (52 pins on 6 ports
for PIC24FJXXXGB2XX devices and 84 pins on
7 ports for PIC24FJXXXGB2XX devices).
3. Available Interrupt-on-Change Notification (ICN)
inputs (52 on PIC24FJXXXGB2XX devices and
84 on PIC24FJXXXGB2XX devices).
4. Available remappable pins (29 pins on
PIC24FJXXXGB2XX devices and 44 pins on
PIC24FJXXXGB2XX devices).
5. Analog channels for ADC (16 channels for
PIC24FJXXXGB206 devices and 24 channels
for PIC24FJXXXGB2XX devices).
All other features for devices in this family are identical.
These are summarized in Table 1-1 and Table 1-2.
A list of the pin features available on the
PIC24FJ256GB210 family devices, sorted by function,
is shown in Table 1-1. Note that this table shows the pin
location of individual peripheral features and not how
they are multiplexed on the same pin. This information
is provided in the pinout diagrams in the beginning of
the data sheet. Multiplexed features are sorted by the
priority given to a feature, with the highest priority
peripheral being listed first.
2010 Microchip Technology Inc. DS39975A-page 17
PIC24FJ256GB210 FAMILY
TABLE 1-1: DEVICE FEATURES FOR THE PIC24FJ256GB210 FAMILY: 64-PIN
Features PIC24FJ128GB206 PIC24FJ256GB206
Operating Frequency DC – 32 MHz
Program Memory (bytes) 128K 256K
Program Memory (instructions) 44,032 87,552
Data Memory (bytes) 96K
Interrupt Sources (soft vectors/NMI traps) 65 (61/4)
I/O Ports Ports B, C, D, E, F, G
Total I/O Pins 52
Remappable Pins 29 (28 I/O, 1 Input only)
Timers:
Total Number (16-bit) 5(1)
32-Bit (from paired 16-bit timers) 2
Input Capture Channels 9(1)
Output Compare/PWM Channels 9(1)
Input Change Notification Interrupt 52
Serial Communications:
UART 4(1)
SPI (3-wire/4-wire) 3(1)
I2C™ 3
Parallel Communications (EPMP/PSP) Yes
JTAG Boundary Scan Yes
10-Bit Analog-to-Digital Converter (ADC) Module
(input channels)
16
Analog Comparators 3
CTMU Interface Yes
USB OTG Yes
Resets (and Delays) POR, BOR, RESET Instruction, MCLR, WDT; Illegal Opcode,
REPEAT Instruction, Hardware Traps, Configuration Word
Mismatch (OST, PLL Lock)
Instruction Set 76 Base Instructions, Multiple Addressing Mode Variations
Packages 64-Pin TQFP and QFN
Note 1: Peripherals are accessible through remappable pins.
PIC24FJ256GB210 FAMILY
DS39975A-page 18 2010 Microchip Technology Inc.
TABLE 1-2: DEVICE FEATURES FOR THE PIC24FJ256GB210 FAMILY: 100-PIN DEVICES
Features PIC24FJ128GB210 PIC24FJ256GB210
Operating Frequency DC – 32 MHz
Program Memory (bytes) 128K 256K
Program Memory (instructions) 44,032 87,552
Data Memory (bytes) 96K
Interrupt Sources (soft vectors/NMI traps) 65 (61/4)
I/O Ports Ports A, B, C, D, E, F, G
Total I/O Pins 84
Remappable Pins 44 (32 I/O, 12 input only)
Timers:
Total Number (16-bit) 5(1)
32-Bit (from paired 16-bit timers) 2
Input Capture Channels 9(1)
Output Compare/PWM Channels 9(1)
Input Change Notification Interrupt 84
Serial Communications:
UART 4(1)
SPI (3-wire/4-wire) 3(1)
I2C™ 3
Parallel Communications (EPMP/PSP) Yes
JTAG Boundary Scan Yes
10-Bit Analog-to-Digital Converter (ADC) Module
(input channels)
24
Analog Comparators 3
CTMU Interface Yes
USB OTG Yes
Resets (and delays) POR, BOR, RESET Instruction, MCLR, WDT;
Illegal Opcode, REPEAT Instruction, Hardware Traps,
Configuration Word Mismatch (OST, PLL Lock)
Instruction Set 76 Base Instructions, Multiple Addressing Mode Variations
Packages 100-Pin TQFP and 121-Pin BGA
Note 1: Peripherals are accessible through remappable pins.
2010 Microchip Technology Inc. DS39975A-page 19
PIC24FJ256GB210 FAMILY
FIGURE 1-1: PIC24FJ256GB210 FAMILY GENERAL BLOCK DIAGRAM
Instruction
Decode and
Control
16
PCH PCL
16
Program Counter
16-Bit ALU
23
24
Data Bus
Inst Register
16
Divide
Support
Inst Latch
16
EA MUX
Read AGU
Write AGU
16
16
8
Interrupt
Controller
EDS and Table
Data Access
Control Block
Stack
Control
Logic
Repeat
Control
Logic
Data Latch
Data RAM
Address
Latch
Address Latch
Extended Data
Data Latch
16
Address Bus
Literal Data
23
Control Signals
16
16
16 x 16
W Reg Array
Multiplier
17x17
OSCI/CLKI
OSCO/CLKO
VDD,
Timing
Generation
VSS MCLR
Power-up
Timer
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
LVD & BOR
Precision
Reference
Band Gap
FRC/LPRC
Oscillators
Regulator
Voltage
VCAP
ENVREG
PORTA(1)
PORTC(1)
(12 I/O)
(8 I/O)
PORTB
(16 I/O)
Note 1:
Not all I/O pins or features are implemented on all device pinout configurations. See Table 1-1 for specific implementations by pin count
.
2:
These peripheral I/Os are only accessible through remappable pins.
PORTD(1)
(16 I/O)
Comparators(2)
Timer2/3(2)
Timer1 RTCC
IC
ADC
10-Bit
OC/PWM SPI I2C
Timer4/5(2)
™
EPMP/PSP
1-9(2) ICNs(1) UART
REFO
PORTE(1)
PORTG(1)
(10 I/O)
(12 I/O)
PORTF(1)
(10 I/O)
1/2/3(2) 1/2/3 1/2/3/4(2)
1-9(2) CTMU(2)
USB OTG
Up to 0x7FFF
Space
Program Memory/
PIC24FJ256GB210 FAMILY
DS39975A-page 20 2010 Microchip Technology Inc.
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
AN0 16 25 K2 I ANA
A/D Analog Inputs.
AN1 15 24 K1 I ANA
AN2 14 23 J2 I ANA
AN3 13 22 J1 I ANA
AN4 12 21 H2 I ANA
AN5 11 20 H1 I ANA
AN6 17 26 L1 I ANA
AN7 18 27 J3 I ANA
AN8 21 32 K4 I ANA
AN9 22 33 L4 I ANA
AN10 23 34 L5 I ANA
AN11 24 35 J5 I ANA
AN12 27 41 J7 I ANA
AN13 28 42 L7 I ANA
AN14 29 43 K7 I ANA
AN15 30 44 L8 I ANA
AN16 — 9 E1 I ANA
AN17 — 10 E3 I ANA
AN18 — 11 F4 I ANA
AN19 — 12 F2 I ANA
AN20 — 14 F3 I ANA
AN21 — 19 G2 I ANA
AN22 — 92 B5 I ANA
AN23 — 91 C5 I ANA
AVDD 19 30 J4 P — Positive Supply for Analog modules.
AVSS 20 31 L3 P — Ground Reference for Analog modules.
C1INA 11 20 H1 I ANA Comparator 1 Input A.
C1INB 12 21 H2 I ANA Comparator 1 Input B.
C1INC 5 11 F4 I ANA Comparator 1 Input C.
C1IND 4 10 E3 I ANA Comparator 1 Input D.
C2INA 13 22 J1 I ANA Comparator 2 Input A.
C2INB 14 23 J2 I ANA Comparator 2 Input B.
C2INC 8 14 F3 I ANA Comparator 2 Input C.
C2IND 6 12 F2 I ANA Comparator 2 Input D.
C3INA 55 84 C7 I ANA Comparator 3 Input A.
C3INB 54 83 D7 I ANA Comparator 3 Input B.
C3INC 48 74 B11 I ANA Comparator 3 Input C.
C3IND 47 73 C10 I ANA Comparator 3 Input D.
CLKI 39 63 F9 I ST Main Clock Input Connection.
CLKO 40 64 F11 O — System Clock Output.
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
2010 Microchip Technology Inc. DS39975A-page 21
PIC24FJ256GB210 FAMILY
CN0 48 74 B11 I ST
Interrupt-on-Change Inputs.
CN1 47 73 C10 I ST
CN2 16 25 K2 I ST
CN3 15 24 K1 I ST
CN4 14 23 J2 I ST
CN5 13 22 J1 I ST
CN6 12 21 H2 I ST
CN7 11 20 H1 I ST
CN8 4 10 E3 I ST
CN9 5 11 F4 I ST
CN10 6 12 F2 I ST
CN11 8 14 F3 I ST
CN12 30 44 L8 I ST
CN13 52 81 C8 I ST
CN14 53 82 B8 I ST
CN15 54 83 D7 I ST
CN16 55 84 C7 I ST
CN17 31 49 L10 I ST
CN18 32 50 L11 I ST
CN19 — 80 D8 I ST
CN20 — 47 L9 I ST
CN21 — 48 K9 I ST
CN22 40 64 F11 I ST
CN23 39 63 F9 I ST
CN24 17 26 L1 I ST
CN25 18 27 J3 I ST
CN26 21 32 K4 I ST
CN27 22 33 L4 I ST
CN28 23 34 L5 I ST
CN29 24 35 J5 I ST
CN30 27 41 J7 I ST
CN31 28 42 L7 I ST
CN32 29 43 K7 I ST
CN33 — 17 G3 I ST
CN34 — 38 J6 I ST
CN35 — 58 H11 I ST
CN36 — 59 G10 I ST
CN37 — 60 G11 I ST
CN38 — 61 G9 I ST
CN39 — 91 C5 I ST
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 22 2010 Microchip Technology Inc.
CN40 — 92 B5 I ST
Interrupt-on-Change Inputs.
CN41 — 28 L2 I ST
CN42 — 29 K3 I ST
CN43 — 66 E11 I ST
CN44 — 67 E8 I ST
CN45 — 6 D1 I ST
CN46 — 7 E4 I ST
CN47 — 8 E2 I ST
CN48 — 9 E1 I ST
CN49 46 72 D9 I ST
CN50 49 76 A11 I ST
CN51 50 77 A10 I ST
CN52 51 78 B9 I ST
CN53 42 68 E9 I ST
CN54 43 69 E10 I ST
CN55 44 70 D11 I ST
CN56 45 71 C11 I ST
CN57 — 79 A9 I ST
CN58 60 93 A4 I ST
CN59 61 94 B4 I ST
CN60 62 98 B3 I ST
CN61 63 99 A2 I ST
CN62 64 100 A1 I ST
CN63 1 3 D3 I ST
CN64 2 4 C1 I ST
CN65 3 5 D2 I ST
CN66 — 18 G1 I ST
CN67 — 19 G2 I ST
CN68 58 87 B6 I ST
CN69 59 88 A6 I ST
CN70 — 52 K11 I ST
CN71 33 51 K10 I ST
CN73 — 54 H8 I ST
CN74 — 53 J10 I ST
CN75 — 40 K6 I ST
CN76 — 39 L6 I ST
CN77 — 90 A5 I ST
CN78 — 89 E6 I ST
CN79 — 96 C3 I ST
CN80 — 97 A3 I ST
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
2010 Microchip Technology Inc. DS39975A-page 23
PIC24FJ256GB210 FAMILY
CN81 — 95 C4 I ST
Interrupt-on-Change Inputs.
CN82 — 1 B2 I ST
CN83 37 57 H10 I ST
CN84 36 56 J11 I ST
CTEDG1 28 42 L7 I ANA CTMU External Edge Input 1.
CTEDG2 27 41 J7 I ANA CTMU External Edge Input 2.
CTPLS 29 43 K7 O — CTMU Pulse Output.
CVREF 23 34 L5 O — Comparator Voltage Reference Output.
D+ 37 57 H10 I/O — USB Differential Plus Line (internal transceiver).
D- 36 56 J11 I/O — USB Differential Minus Line (internal transceiver).
DMH 46 72 D9 O — D- External Pull-up Control Output.
DMLN 42 68 E9 O — D- External Pull-down Control Output.
DPH 50 77 A10 O — D+ External Pull-up Control Output.
DPLN 43 69 E10 O — D+ External Pull-down Control Output.
ENVREG 57 86 J7 I ST Voltage Regulator Enable.
INT0 46 72 D9 I ST External Interrupt Input.
MCLR 7 13 F1 I ST Master Clear (device Reset) Input. This line is brought low
to cause a Reset.
OSCI 39 63 F9 I ANA Main Oscillator Input Connection.
OSCO 40 64 F11 O ANA Main Oscillator Output Connection.
PGEC1 15 24 K1 I/O ST In-Circuit Debugger/Emulator/ICSP™ Programming Clock 1.
PGED1 16 25 K2 I/O ST In-Circuit Debugger/Emulator/ICSP Programming Data 1.
PGEC2 17 26 L1 I/O ST In-Circuit Debugger/Emulator/ICSP Programming Clock 2.
PGED2 18 27 J3 I/O ST In-Circuit Debugger/Emulator/ICSP Programming Data 2.
PGEC3 11 20 H1 I/O ST In-Circuit Debugger/Emulator/ICSP Programming Clock 3.
PGED3 12 21 H2 I/O ST In-Circuit Debugger/Emulator/ICSP Programming Data 3.
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 24 2010 Microchip Technology Inc.
PMA0 30 44 L8 I/O ST Parallel Master Port Address Bit 0 Input (Buffered Slave
modes) and Output (Master modes).
PMA1 29 43 K7 I/O ST Parallel Master Port Address Bit 1 Input (Buffered Slave
modes) and Output (Master modes).
PMA2 8 14 F3 O —
Parallel Master Port Address bits<22:2>.
PMA3 6 12, 60(1) F2, G11(1) O—
PMA4 5 11,59(1) F4,G10(1) O—
PMA5 4 10,40(1) E3,K6(1) O—
PMA6 16 29 K3 O —
PMA7 22 28 L2 O —
PMA8 32 50 L11 O —
PMA9 31 49 L10 O —
PMA10 28 42 L7 O —
PMA11 27 41 J7 O —
PMA12 24 35 J5 O —
PMA13 23 34 L5 O —
PMA14 45 71 C11 O —
PMA15 44 70 D11 O —
PMA16 — 95 C4 O —
PMA17 — 92 B5 O —
PMA18 — 40,10(1) K6,E3(1) O—
PMA19 — 19 G2 O —
PMA20 — 59, 11(1) G10, F4(1) O—
PMA21 — 60,12(1) G11,F2(1) O—
PMA22 — 66,9(1) E11,E1(1) O—
PMACK1 50 77 A10 I ST/TTL Parallel Master Port Acknowledge Input 1.
PMACK2 43 69 E10 I ST/TTL Parallel Master Port Acknowledge Input 2.
PMALL 30 44 L8 O — Parallel Master Port Lower Address Latch Strobe.
PMALH 29 43 K7 O — Parallel Master Port Higher Address Latch Strobe.
PMALU — 14 F3 O — Parallel Master Port Upper Address Latch Strobe.
PMBE0 51 78 B9 O — Parallel Master Port Byte Enable Strobe 0.
PMBE1 — 67 E8 O — Parallel Master Port Byte Enable Strobe 1.
PMCS1 45 71(3),18 C11(3),G1 I/O ST/TTL Parallel Master Port Chip Select Strobe 1.
PMCS2 44 70(2),9,
66(1)
D11(2),E1,
E11(1)
O — Parallel Master Port Chip Select Strobe 2.
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
2010 Microchip Technology Inc. DS39975A-page 25
PIC24FJ256GB210 FAMILY
PMD0 60 93 A4 I/O ST/TTL
Parallel Master Port Data bits<15:0>.
PMD1 61 94 B4 I/O ST/TTL
PMD2 62 98 B3 I/O ST/TTL
PMD3 63 99 A2 I/O ST/TTL
PMD4 64 100 A1 I/O ST/TTL
PMD5 1 3 D3 I/O ST/TTL
PMD6 2 4 C1 I/O ST/TTL
PMD7 3 5 D2 I/O ST/TTL
PMD8 — 90 A5 I/O ST/TTL
PMD9 — 89 E6 I/O ST/TTL
PMD10 — 88 A6 I/O ST/TTL
PMD11 — 87 B6 I/O ST/TTL
PMD12 — 79 A9 I/O ST/TTL
PMD13 — 80 D8 I/O ST/TTL
PMD14 — 83 D7 I/O ST/TTL
PMD15 — 84 C7 I/O ST/TTL
PMRD 53 82 B8 I/O ST/TTL Parallel Master Port Read Strobe.
PMWR 52 81 C8 I/O ST/TTL Parallel Master Port Write Strobe.
RA0 — 17 G3 I/O ST
PORTA Digital I/O.
RA1 — 38 J6 I/O ST
RA2 — 58 H11 I/O ST
RA3 — 59 G10 I/O ST
RA4 — 60 G11 I/O ST
RA5 — 61 G9 I/O ST
RA6 — 91 C5 I/O ST
RA7 — 92 B5 I/O ST
RA9 — 28 L2 I/O ST
RA10 — 29 K3 I/O ST
RA14 — 66 E11 I/O ST
RA15 — 67 E8 I/O ST
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 26 2010 Microchip Technology Inc.
RB0 16 25 K2 I/O ST
PORTB Digital I/O.
RB1 15 24 K1 I/O ST
RB2 14 23 J2 I/O ST
RB3 13 22 J1 I/O ST
RB4 12 21 H2 I/O ST
RB5 11 20 H1 I/O ST
RB6 17 26 L1 I/O ST
RB7 18 27 J3 I/O ST
RB8 21 32 K4 I/O ST
RB9 22 33 L4 I/O ST
RB10 23 34 L5 I/O ST
RB11 24 35 J5 I/O ST
RB12 27 41 J7 I/O ST
RB13 28 42 L7 I/O ST
RB14 29 43 K7 I/O ST
RB15 30 44 L8 I/O ST
RC1 — 6 D1 I/O ST
PORTC Digital I/O.
RC2 — 7 E4 I/O ST
RC3 — 8 E2 I/O ST
RC4 — 9 E1 I/O ST
RC12 39 63 F9 I/O ST
RC13 47 73 C10 I/O ST
RC14 48 74 B11 I/O ST
RC15 40 64 F11 I/O ST
RCV 18 27 J3 I ST USB Receive Input (from external transceiver).
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
2010 Microchip Technology Inc. DS39975A-page 27
PIC24FJ256GB210 FAMILY
RD0 46 72 D9 I/O ST
PORTD Digital I/O.
RD1 49 76 A11 I/O ST
RD2 50 77 A10 I/O ST
RD3 51 78 B9 I/O ST
RD4 52 81 C8 I/O ST
RD5 53 82 B8 I/O ST
RD6 54 83 D7 I/O ST
RD7 55 84 C7 I/O ST
RD8 42 68 E9 I/O ST
RD9 43 69 E10 I/O ST
RD10 44 70 D11 I/O ST
RD11 45 71 C11 I/O ST
RD12 — 79 A9 I/O ST
RD13 — 80 D8 I/O ST
RD14 — 47 L9 I/O ST
RD15 — 48 K9 I/O ST
RE0 60 93 A4 I/O ST
PORTE Digital I/O.
RE1 61 94 B4 I/O ST
RE2 62 98 B3 I/O ST
RE3 63 99 A2 I/O ST
RE4 64 100 A1 I/O ST
RE5 1 3 D3 I/O ST
RE6 2 4 C1 I/O ST
RE7 3 5 D2 I/O ST
RE8 — 18 G1 I/O ST
RE9 — 19 G2 I/O ST
REFO 30 44 L8 O — Reference Clock Output.
RF0 58 87 B6 I/O ST
PORTF Digital I/O.
RF1 59 88 A6 I/O ST
RF2 — 52 K11 I/O ST
RF3 33 51 K10 I/O ST
RF4 31 49 L10 I/O ST
RF5 32 50 L11 I/O ST
RF7 34 54 H8 I/O ST
RF8 — 53 J10 I/O ST
RF12 — 40 K6 I/O ST
RF13 — 39 L6 I/O ST
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 28 2010 Microchip Technology Inc.
RG0 — 90 A5 I/O ST
PORTG Digital I/O.
RG1 — 89 E6 I/O ST
RG2 37 57 H10 I/O ST
RG3 36 56 J11 I/O ST
RG6 4 10 E3 I/O ST
RG7 5 11 F4 I/O ST
RG8 6 12 F2 I/O ST
RG9 8 14 F3 I/O ST
RG12 — 96 C3 I/O ST
RG13 — 97 A3 I/O ST
RG14 — 95 C4 I/O ST
RG15 — 1 B2 I/O ST
RP0 16 25 K2 I/O ST
Remappable Peripheral (input or output).
RP1 15 24 K1 I/O ST
RP2 42 68 E9 I/O ST
RP3 44 70 D11 I/O ST
RP4 43 69 E10 I/O ST
RP5 — 48 K9 I/O ST
RP6 17 26 L1 I/O ST
RP7 18 27 J3 I/O ST
RP8 21 32 K4 I/O ST
RP9 22 33 L4 I/O ST
RP10 31 49 L10 I/O ST
RP11 46 72 D9 I/O ST
RP12 45 71 C11 I/O ST
RP13 14 23 J2 I/O ST
RP14 29 43 K7 I/O ST
RP15 — 53 J10 I/O ST
RP16 33 51 K10 I/O ST
RP17 32 50 L11 I/O ST
RP18 11 20 H1 I/O ST
RP19 6 12 F2 I/O ST
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
2010 Microchip Technology Inc. DS39975A-page 29
PIC24FJ256GB210 FAMILY
RP20 53 82 B8 I/O ST
Remappable Peripheral (input or output).
RP21 4 10 E3 I/O ST
RP22 51 78 B9 I/O ST
RP23 50 77 A10 I/O ST
RP24 49 76 A11 I/O ST
RP25 52 81 C8 I/O ST
RP26 5 11 F4 I/O ST
RP27 8 14 F3 I/O ST
RP28 12 21 H2 I/O ST
RP29 30 44 L8 I/O ST
RP30 — 52 K11 I/O ST
RP31 — 39 L6 I/O ST
RPI32 — 40 K6 I ST
Remappable Peripheral (input only).
RPI33 — 18 G1 I ST
RPI34 — 19 G2 I ST
RPI35 — 67 E8 I ST
RPI36 — 66 E11 I ST
RPI37 48 74 B11 I ST
RPI38 — 6 D1 I ST
RPI39 — 7 E4 I ST
RPI40 — 8 E2 I ST
RPI41 — 9 E1 I ST
RPI42 — 79 A9 I ST
RPI43 — 47 L9 I ST
RTCC 42 68 E9 O — Real-Time Clock Alarm/Seconds Pulse Output.
SCL1 44 66 E11 I/O I2C™ I2C1 Synchronous Serial Clock Input/Output.
SCL2 32 58 H11 I/O I2C I2C2 Synchronous Serial Clock Input/Output.
SCL3 2 4 C1 I/O I2C I2C3 Synchronous Serial Clock Input/Output.
SCLKI 48 74 B11 O ANA Secondary Clock Input.
SDA1 43 67 E8 I/O I2C I2C1 Data Input/Output.
SDA2 31 59 G10 I/O I2C I2C2 Data Input/Output.
SDA3 3 5 D2 I/O I2C I2C3 Data Input/Output.
SESSEND 55 84 C7 I ST USB VBUS Boost Generator, Comparator Input 3.
SESSVLD 59 88 A6 I ST USB VBUS Boost Generator, Comparator Input 2.
SOSCI 47 73 C10 I ANA Secondary Oscillator/Timer1 Clock Input.
SOSCO 48 74 B11 O ANA Secondary Oscillator/Timer1 Clock Output.
T1CK 48 74 B11 I ST Timer1 Clock.
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 30 2010 Microchip Technology Inc.
TCK 27 38 J6 I ST JTAG Test Clock Input.
TDI 28 60 G11 I ST JTAG Test Data Input.
TDO 24 61 G9 O — JTAG Test Data Output.
TMS 23 17 G3 I ST JTAG Test Mode Select Input.
USBID 33 51 K10 I ST USB OTG ID (OTG mode only).
USBOEN 12 21 H2 O — USB Output Enable Control (for external transceiver).
VBUS 34 54 H8 I ANA USB Voltage, Host mode (5V).
VBUSCHG 49 76 A11 O — External USB VBUS Charge Output.
VBUSON 11 20 H1 O — USB OTG External Charge Pump Control.
VBUSST 58 87 B6 I ANA USB OTG Internal Charge Pump Feedback Control.
VBUSVLD 58 87 B6 I ST USB VBUS Boost Generator, Comparator Input 1.
VCAP 56 85 B7 P — External Filter Capacitor Connection (regulator enabled).
VCMPST1 58 87 B6 I ST USB VBUS Boost Generator, Comparator Input 1.
VCMPST2 59 88 A6 I ST USB VBUS Boost Generator, Comparator Input 2.
VCPCON 49 76 A11 O — USB OTG VBUS PWM/Charge Output.
VDD 10, 26, 38 2, 16, 37,
46, 62
C2, C9, F8,
G5, H6, K8,
H4, E5
P — Positive Supply for Peripheral Digital Logic and I/O Pins.
VMIO 14 23 J2 I ST USB Differential Minus Input/Output (external transceiver).
VPIO 13 22 J1 I ST USB Differential Plus Input/Output (external transceiver).
VREF-1528, 24
(4) L2, K1(4) I ANA A/D and Comparator Reference Voltage (low) Input.
VREF+1629, 25
(4) K3, K2(4) I ANA A/D and Comparator Reference Voltage (high) Input.
VSS 9, 25, 41 15, 36, 45,
65, 75
B10, F5,
F10, G6,
G7, H3, D4,
D5
P — Ground Reference for Logic and I/O Pins.
VUSB 35 55 H9 P — USB Voltage (3.3V).
TABLE 1-3: PIC24FJ256GB210 FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O Input
Buffer Description
64-Pin
TQFP/QFN
100-Pin
TQFP
121-Pin
BGA
Legend: TTL = TTL input buffer ST = Schmitt Trigger input buffer
ANA = Analog level input/output I2C™ = I2C/SMBus input buffer
Note 1: The alternate EPMP pins are selected when the ALTPMP (CW3<12>) bit is programmed to ‘0’.
2: The PMSC2 signal will replace the PMA15 signal on the 15-pin PMA when CSF<1:0> = 01 or 10.
3: The PMCS1 signal will replace the PMA14 signal on the 14-pin PMA when CSF<1:0> = 10.
4: The alternate VREF pins selected when the ALTVREF (CW1<5>) bit is programmed to ‘0’.
2010 Microchip Technology Inc. DS39975A-page 31
PIC24FJ256GB210 FAMILY
2.0 GUIDELINES FOR GETTING
STARTED WITH 16-BIT
MICROCONTROLLERS
2.1 Basic Connection Requirements
Getting started with the PIC24FJ256GB210 family of
16-bit microcontrollers requires attention to a minimal
set of device pin connections before proceeding with
development.
The following pins must always be connected:
•All V
DD and VSS pins
(see Section 2.2 “Power Supply Pins”)
•All AV
DD and AVSS pins, regardless of whether or
not the analog device features are used
(see Section 2.2 “Power Supply Pins”)
•MCLR
pin
(see Section 2.3 “Master Clear (MCLR) Pin”)
• ENVREG and VCAP pins (PIC24FJ devices only)
(see Section 2.4 “Voltage Regulator Pins
(ENVREG and VCAP)”)
These pins must also be connected if they are being
used in the end application:
• PGECx/PGEDx pins used for In-Circuit Serial
Programming™ (ICSP™) and debugging purposes
(see Section 2.5 “ICSP Pins”)
• OSCI and OSCO pins when an external oscillator
source is used
(see Section 2.6 “External Oscillator Pins”)
Additionally, the following pins may be required:
•V
REF+/VREF- pins used when external voltage
reference for analog modules is implemented
The minimum mandatory connections are shown in
Figure 2-1.
FIGURE 2-1: RECOMMENDED
MINIMUM CONNECTIONS
Note: The AVDD and AVSS pins must always be
connected, regardless of whether any of
the analog modules are being used.
PIC24FXXXX
VDD
VSS
VDD
VSS
VSS
VDD
AVDD
AVSS
VDD
VSS
C1
R1
VDD
MCLR
VCAP
R2 ENVREG
(1)
C7
C2(2)
C3(2)
C4(2)
C5(2)
C6(2)
Key (all values are recommendations):
C1 through C6: 0.1 F, 20V ceramic
C7: 10 F, 6.3V or greater, tantalum or ceramic
R1: 10 kΩ
R2: 100Ω to 470Ω
Note 1: See Section 2.4 “Voltage Regulator Pins
(ENVREG and VCAP)” for explanation of
ENVREG pin connections.
2: The example shown is for a PIC24F device
with five VDD/VSS and AVDD/AVSS pairs.
Other devices may have more or less pairs;
adjust the number of decoupling capacitors
appropriately.
(1)
PIC24FJ256GB210 FAMILY
DS39975A-page 32 2010 Microchip Technology Inc.
2.2 Power Supply Pins
2.2.1 DECOUPLING CAPACITORS
The use of decoupling capacitors on every pair of
power supply pins, such as VDD, VSS, AVDD and
AVSS is required.
Consider the following criteria when using decoupling
capacitors:
•Value and type of capacitor: A 0.1 F (100 nF),
10-20V capacitor is recommended. The capacitor
should be a low-ESR device with a resonance
frequency in the range of 200 MHz and higher.
Ceramic capacitors are recommended.
•Placement on the printed circuit board: The
decoupling capacitors should be placed as close
to the pins as possible. It is recommended to
place the capacitors on the same side of the
board as the device. If space is constricted, the
capacitor can be placed on another layer on the
PCB using a via; however, ensure that the trace
length from the pin to the capacitor is no greater
than 0.25 inch (6 mm).
•Handling high-frequency noise: If the board is
experiencing high-frequency noise (upward of
tens of MHz), add a second ceramic type capaci-
tor in parallel to the above described decoupling
capacitor. The value of the second capacitor can
be in the range of 0.01 F to 0.001 F. Place this
second capacitor next to each primary decoupling
capacitor. In high-speed circuit designs, consider
implementing a decade pair of capacitances as
close to the power and ground pins as possible
(e.g., 0.1 F in parallel with 0.001 F).
•Maximizing performance: On the board layout
from the power supply circuit, run the power and
return traces to the decoupling capacitors first,
and then to the device pins. This ensures that the
decoupling capacitors are first in the power chain.
Equally important is to keep the trace length
between the capacitor and the power pins to a
minimum, thereby reducing PCB trace
inductance.
2.2.2 TANK CAPACITORS
On boards with power traces running longer than six
inches in length, it is suggested to use a tank capacitor
for integrated circuits including microcontrollers to
supply a local power source. The value of the tank
capacitor should be determined based on the trace
resistance that connects the power supply source to
the device, and the maximum current drawn by the
device in the application. In other words, select the tank
capacitor so that it meets the acceptable voltage sag at
the device. Typical values range from 4.7 F to 47 F.
2.3 Master Clear (MCLR) Pin
The MCLR pin provides two specific device
functions: device Reset, and device programming
and debugging. If programming and debugging are
not required in the end application, a direct
connection to VDD may be all that is required. The
addition of other components, to help increase the
application’s resistance to spurious Resets from
voltage sags, may be beneficial. A typical
configuration is shown in Figure 2-1. Other circuit
designs may be implemented, depending on the
application’s requirements.
During programming and debugging, the resistance
and capacitance that can be added to the pin must
be considered. Device programmers and debuggers
drive the MCLR pin. Consequently, specific voltage
levels (VIH and VIL) and fast signal transitions must
not be adversely affected. Therefore, specific values
of R1 and C1 will need to be adjusted based on the
application and PCB requirements. For example, it is
recommended that the capacitor, C1, be isolated
from the MCLR pin during programming and
debugging operations by using a jumper (Figure 2-2).
The jumper is replaced for normal run-time
operations.
Any components associated with the MCLR pin
should be placed within 0.25 inch (6 mm) of the pin.
FIGURE 2-2: EXAMPLE OF MCLR PIN
CONNECTIONS
Note 1: R1 10 k is recommended. A suggested
starting value is 10 k. Ensure that the
MCLR pin VIH and VIL specifications are met.
2: R2 470 will limit any current flowing into
MCLR from the external capacitor, C, in the
event of MCLR pin breakdown, due to
Electrostatic Discharge (ESD) or Electrical
Overstress (EOS). Ensure that the MCLR pin
VIH and VIL specifications are met.
C1
R2
R1
VDD
MCLR
PIC24FXXXX
JP
2010 Microchip Technology Inc. DS39975A-page 33
PIC24FJ256GB210 FAMILY
2.4 Voltage Regulator Pins (ENVREG
and VCAP)
The on-chip voltage regulator enable pin (ENVREG)
must always be connected directly to a supply voltage.
Refer to Section 26.2 “On-Chip Voltage Regulator”
for details on connecting and using the on-chip
regulator.
When the regulator is enabled, a low-ESR (<5Ω)
capacitor is required on the VCAP pin to stabilize the
voltage regulator output voltage. The VCAP pin must not
be connected to VDD, and must use a capacitor of 10 F
connected to ground. The type can be ceramic or
tantalum. A suitable example is the Murata
GRM21BF50J106ZE01 (10 F, 6.3V) or equivalent.
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices.
The placement of this capacitor should be close to
VCAP. It is recommended that the trace length not
exceed 0.25 inch (6 mm). Refer to Section 29.0
“Electrical Characteristics” for additional
information.
FIGURE 2-3: FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
2.5 ICSP Pins
The PGECx and PGEDx pins are used for In-Circuit
Serial Programming™ (ICSP™) and debugging pur-
poses. It is recommended to keep the trace length
between the ICSP connector and the ICSP pins on the
device as short as possible. If the ICSP connector is
expected to experience an ESD event, a series resistor
is recommended, with the value in the range of a few
tens of ohms, not to exceed 100Ω.
Pull-up resistors, series diodes and capacitors on the
PGECx and PGEDx pins are not recommended as they
will interfere with the programmer/debugger communi-
cations to the device. If such discrete components are
an application requirement, they should be removed
from the circuit during programming and debugging.
Alternatively, refer to the AC/DC characteristics and
timing requirements information in the respective
device Flash programming specification for information
on capacitive loading limits and pin input voltage high
(VIH) and input low (VIL) requirements.
For device emulation, ensure that the “Communication
Channel Select” (i.e., PGECx/PGEDx pins) programmed
into the device matches the physical connections for the
ICSP to the Microchip debugger/emulator tool.
For more information on available Microchip
development tools connection requirements, refer to
Section 27.0 “Development Support”.
Note: This section applies only to PIC24FJ
devices with an on-chip voltage regulator.
10
1
0.1
0.01
0.001 0.01 0.1 1 10 100 1000 10,000
Frequency (MHz)
ESR ()
Note: Data for Murata GRM21BF50J106ZE01 shown.
Measurements at 25°C, 0V DC bias.
PIC24FJ256GB210 FAMILY
DS39975A-page 34 2010 Microchip Technology Inc.
2.6 External Oscillator Pins
Many microcontrollers have options for at least two
oscillators: a high-frequency primary oscillator and a
low-frequency secondary oscillator (refer to
Section 8.0 “Oscillator Configuration” for details).
The oscillator circuit should be placed on the same
side of the board as the device. Place the oscillator
circuit close to the respective oscillator pins with no
more than 0.5 inch (12 mm) between the circuit
components and the pins. The load capacitors should
be placed next to the oscillator itself, on the same side
of the board.
Use a grounded copper pour around the oscillator cir-
cuit to isolate it from surrounding circuits. The
grounded copper pour should be routed directly to the
MCU ground. Do not run any signal traces or power
traces inside the ground pour. Also, if using a two-sided
board, avoid any traces on the other side of the board
where the crystal is placed.
Layout suggestions are shown in Figure 2-4. In-line
packages may be handled with a single-sided layout
that completely encompasses the oscillator pins. With
fine-pitch packages, it is not always possible to com-
pletely surround the pins and components. A suitable
solution is to tie the broken guard sections to a mirrored
ground layer. In all cases, the guard trace(s) must be
returned to ground.
In planning the application’s routing and I/O assign-
ments, ensure that adjacent port pins and other signals
in close proximity to the oscillator are benign (i.e., free
of high frequencies, short rise and fall times and other
similar noise).
For additional information and design guidance on
oscillator circuits, please refer to these Microchip
Application Notes, available at the corporate web site
(www.microchip.com):
• AN826, “Crystal Oscillator Basics and Crystal
Selection for rfPIC™ and PICmicro® Devices”
• AN849, “Basic PICmicro® Oscillator Design”
• AN943, “Practical PICmicro® Oscillator Analysis
and Design”
•AN949, “Making Your Oscillator Work”
FIGURE 2-4: SUGGESTED PLACEMENT
OF THE OSCILLATOR
CIRCUIT
GND
`
`
`
OSCI
OSCO
SOSCO
SOSC I
Copper Pour Primary Oscillator
Crystal
Secondary
Crystal
DEVICE PINS
Primary
Oscillator
C1
C2
Sec Oscillator: C1 Sec Oscillator: C2
(tied to ground)
GND
OSCO
OSCI
Bottom Layer
Copper Pour
Oscillator
Crystal
Top Layer Copper Pour
C2
C1
DEVICE PINS
(tied to ground)
(tied to ground)
Single-Sided and In-line Layouts:
Fine-Pitch (Dual-Sided) Layouts:
Oscillator
2010 Microchip Technology Inc. DS39975A-page 35
PIC24FJ256GB210 FAMILY
2.7 Configuration of Analog and
Digital Pins During ICSP
Operations
If an ICSP compliant emulator is selected as a debug-
ger, it automatically initializes all of the A/D input pins
(ANx) as “digital” pins. Depending on the particular
device, this is done by clearing all bit in the ANSx reg-
isters.
All PIC24FJ devices will have several ANSx registers
(one for each port). Refer to (Section 10.0 “I/O Ports”)
for more specific information.
The bits in these registers that correspond to the A/D
pins that initialized the emulator must not be changed
by the user application firmware; otherwise,
communication errors will result between the debugger
and the device.
If your application needs to use certain A/D pins as
analog input pins during the debug session, the user
application must modify the appropriate bits during
initialization of the ADC module, as follows:
• Set the bits corresponding to the pin(s) to be con-
figured as analog. Do not change any other bits,
particularly those corresponding to the
PGECx/PGEDx pair, at any time.
When a Microchip debugger/emulator is used as a
programmer, the user application firmware must
correctly configure the ANSx registers. Automatic
initialization of this register is only done during
debugger operation. Failure to correctly configure the
register(s) will result in all A/D pins being recognized as
analog input pins, resulting in the port value being read
as a logic ‘0’, which may affect user application
functionality.
2.8 Unused I/Os
Unused I/O pins should be configured as outputs and
driven to a logic low state. Alternatively, connect a 1 kΩ
to 10 kΩ resistor to VSS on unused pins and drive the
output to logic low.
PIC24FJ256GB210 FAMILY
DS39975A-page 36 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 37
PIC24FJ256GB210 FAMILY
3.0 CPU
The PIC24F CPU has a 16-bit (data) modified Harvard
architecture with an enhanced instruction set and a
24-bit instruction word with a variable length opcode
field. The Program Counter (PC) is 23 bits wide and
addresses up to 4M instructions of user program
memory space. A single-cycle instruction prefetch
mechanism is used to help maintain throughput and
provides predictable execution. All instructions execute
in a single cycle, with the exception of instructions that
change the program flow, the double-word move
(MOV.D) instruction and the table instructions.
Overhead-free program loop constructs are supported
using the REPEAT instructions, which are interruptible
at any point.
PIC24F devices have sixteen, 16-bit working registers
in the programmer’s model. Each of the working
registers can act as a data, address or address offset
register. The 16th working register (W15) operates as a
Software Stack Pointer for interrupts and calls.
The lower 32 Kbytes of the data space can be
accessed linearly. The upper 32 Kbytes of the data
space are referred to as extended data space to which
the extended data RAM, EPMP memory space or
program memory can be mapped.
The Instruction Set Architecture (ISA) has been
significantly enhanced beyond that of the PIC18, but
maintains an acceptable level of backward compatibil-
ity. All PIC18 instructions and addressing modes are
supported, either directly, or through simple macros.
Many of the ISA enhancements have been driven by
compiler efficiency needs.
The core supports Inherent (no operand), Relative,
Literal, Memory Direct Addressing modes along with
three groups of addressing modes. All modes support
Register Direct and various Register Indirect modes.
Each group offers up to seven addressing modes.
Instructions are associated with predefined addressing
modes depending upon their functional requirements.
For most instructions, the core is capable of executing
a data (or program data) memory read, a working reg-
ister (data) read, a data memory write and a program
(instruction) memory read per instruction cycle. As a
result, three parameter instructions can be supported,
allowing trinary operations (that is, A + B = C) to be
executed in a single cycle.
A high-speed, 17-bit x 17-bit multiplier has been
included to significantly enhance the core arithmetic
capability and throughput. The multiplier supports
Signed, Unsigned and Mixed mode, 16-bit x 16-bit or
8-bit x 8-bit, integer multiplication. All multiply
instructions execute in a single cycle.
The 16-bit ALU has been enhanced with integer divide
assist hardware that supports an iterative non-restoring
divide algorithm. It operates in conjunction with the
REPEAT instruction looping mechanism and a selection
of iterative divide instructions to support 32-bit (or
16-bit), divided by 16-bit, integer signed and unsigned
division. All divide operations require 19 cycles to
complete but are interruptible at any cycle boundary.
The PIC24F has a vectored exception scheme with up
to 8 sources of non-maskable traps and up to 118 inter-
rupt sources. Each interrupt source can be assigned to
one of seven priority levels.
A block diagram of the CPU is shown in Figure 3-1.
3.1 Programmer’s Model
The programmer’s model for the PIC24F is shown in
Figure 3-2. All registers in the programmer’s model are
memory mapped and can be manipulated directly by
instructions. A description of each register is provided
in Table 3-1. All registers associated with the
programmer’s model are memory mapped.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 44. “CPU with Extended Data
Space (EDS)” (DS39732). The informa-
tion in this data sheet supersedes the
information in the FRM.
PIC24FJ256GB210 FAMILY
DS39975A-page 38 2010 Microchip Technology Inc.
FIGURE 3-1: PIC24F CPU CORE BLOCK DIAGRAM
TABLE 3-1: CPU CORE REGISTERS
Register(s) Name Description
W0 through W15 Working Register Array
PC 23-Bit Program Counter
SR ALU STATUS Register
SPLIM Stack Pointer Limit Value Register
TBLPAG Table Memory Page Address Register
RCOUNT Repeat Loop Counter Register
CORCON CPU Control Register
DISICNT Disable Interrupt Count Register
DSRPAG Data Space Read Page Register
DSWPAG Data Space Write Page Register
Instruction
Decode and
Control
PCH PCL
16
Program Counter
16-Bit ALU
23
23
24
23
Data Bus
Instruction Reg
16
16 x 16
W Register Array
Divide
Support
ROM Latch
16
EA MUX
RAGU
WAGU
16
16
8
Interrupt
Controller
EDS and Table
Data Access
Control Block
Stack
Control
Logic
Loop
Control
Logic
Data Latch
Data RAM
Address
Latch
Control Signals
to Various Blocks
Program Memory/
Data Latch
Address Bus
16
Literal Data
16 16
Hardware
Multiplier
16
To Peripheral Modules
Address Latch
Up to 0x7FFF
Extended Data
Space
2010 Microchip Technology Inc. DS39975A-page 39
PIC24FJ256GB210 FAMILY
FIGURE 3-2: PROGRAMMER’S MODEL
N OV Z C
TBLPAG
22 0
7 0
015
Program Counter
Table Memory Page
ALU STATUS Register (SR)
Working/Address
Registers
W0 (WREG)
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
W13
Frame Pointer
Stack Pointer
RA
0
RCOUNT
15 0 Repeat Loop Counter
SPLIM Stack Pointer Limit
SRL
0
0
15 0CPU Control Register (CORCON)
SRH
W14
W15
DC
IPL
210
———————
PC
Divider Working Registers
Multiplier Registers
15 0
Value Register
Address Register
Register
Data Space Read Page Register
Data Space Write Page Register
Disable Interrupt Count Register
13 0
DISICNT
90
DSRPAG
80
DSWPAG
IPL3
————————————
Registers or bits are shadowed for PUSH.S and POP.S instructions.
———
PIC24FJ256GB210 FAMILY
DS39975A-page 40 2010 Microchip Technology Inc.
3.2 CPU Control Registers
REGISTER 3-1: SR: ALU STATUS REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 R/W-0, HSC
— — — — — — —DC
bit 15 bit 8
R/W-0, HSC(1) R/W-0, HSC(1) R/W-0, HSC(1) R-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
IPL2(2) IPL1(2) IPL0(2) RA N OV Z C
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-9 Unimplemented: Read as ‘0’
bit 8 DC: ALU Half Carry/Borrow bit
1 = A carry out from the 4th low-order bit (for byte-sized data) or 8th low-order bit (for word-sized data)
of the result occurred
0 = No carry out from the 4th or 8th low-order bit of the result has occurred
bit 7-5 IPL<2:0>: CPU Interrupt Priority Level Status bits(1,2)
111 = CPU interrupt priority level is 7 (15); user interrupts are disabled
110 = CPU interrupt priority level is 6 (14)
101 = CPU interrupt priority level is 5 (13)
100 = CPU interrupt priority level is 4 (12)
011 = CPU interrupt priority level is 3 (11)
010 = CPU interrupt priority level is 2 (10)
001 = CPU interrupt priority level is 1 (9)
000 = CPU interrupt priority level is 0 (8)
bit 4 RA: REPEAT Loop Active bit
1 = REPEAT loop in progress
0 = REPEAT loop not in progress
bit 3 N: ALU Negative bit
1 = Result was negative
0 = Result was not negative (zero or positive)
bit 2 OV: ALU Overflow bit
1 = Overflow occurred for signed (2’s complement) arithmetic in this arithmetic operation
0 = No overflow has occurred
bit 1 Z: ALU Zero bit
1 = An operation, which affects the Z bit, has set it at some time in the past
0 = The most recent operation, which affects the Z bit, has cleared it (i.e., a non-zero result)
bit 0 C: ALU Carry/Borrow bit
1 = A carry out from the Most Significant bit of the result occurred
0 = No carry out from the Most Significant bit of the result occurred
Note 1: The IPL Status bits are read-only when NSTDIS (INTCON1<15>) = 1.
2: The IPL Status bits are concatenated with the IPL3 (CORCON<3>) bit to form the CPU Interrupt Priority
Level (IPL). The value in parentheses indicates the IPL when IPL3 = 1.
2010 Microchip Technology Inc. DS39975A-page 41
PIC24FJ256GB210 FAMILY
3.3 Arithmetic Logic Unit (ALU)
The PIC24F ALU is 16 bits wide and is capable of addi-
tion, subtraction, bit shifts and logic operations. Unless
otherwise mentioned, arithmetic operations are 2’s
complement in nature. Depending on the operation, the
ALU may affect the values of the Carry (C), Zero (Z),
Negative (N), Overflow (OV) and Digit Carry (DC)
Status bits in the SR register. The C and DC Status bits
operate as Borrow and Digit Borrow bits, respectively,
for subtraction operations.
The ALU can perform 8-bit or 16-bit operations,
depending on the mode of the instruction that is used.
Data for the ALU operation can come from the W
register array, or data memory, depending on the
addressing mode of the instruction. Likewise, output
data from the ALU can be written to the W register array
or a data memory location.
The PIC24F CPU incorporates hardware support for
both multiplication and division. This includes a
dedicated hardware multiplier and support hardware
for 16-bit divisor division.
3.3.1 MULTIPLIER
The ALU contains a high-speed, 17-bit x 17-bit
multiplier. It supports unsigned, signed or mixed sign
operation in several multiplication modes:
1. 16-bit x 16-bit signed
2. 16-bit x 16-bit unsigned
3. 16-bit signed x 5-bit (literal) unsigned
4. 16-bit unsigned x 16-bit unsigned
5. 16-bit unsigned x 5-bit (literal) unsigned
6. 16-bit unsigned x 16-bit signed
7. 8-bit unsigned x 8-bit unsigned
REGISTER 3-2: CORCON: CPU CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 R/C-0, HSC R-1 U-0 U-0
— — — —IPL3
(1) r — —
bit 7 bit 0
Legend: C = Clearable bit r = Reserved bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-4 Unimplemented: Read as ‘0’
bit 3 IPL3: CPU Interrupt Priority Level Status bit(1)
1 = CPU interrupt priority level is greater than 7
0 = CPU interrupt priority level is 7 or less
bit 2 Reserved: Read as ‘1’
bit 1-0 Unimplemented: Read as ‘0’
Note 1: The IPL3 bit is concatenated with the IPL<2:0> bits (SR<7:5>) to form the CPU Interrupt Priority Level; see
Register 3-1 for bit description.
PIC24FJ256GB210 FAMILY
DS39975A-page 42 2010 Microchip Technology Inc.
3.3.2 DIVIDER
The divide block supports signed and unsigned integer
divide operations with the following data sizes:
1. 32-bit signed/16-bit signed divide
2. 32-bit unsigned/16-bit unsigned divide
3. 16-bit signed/16-bit signed divide
4. 16-bit unsigned/16-bit unsigned divide
The quotient for all divide instructions ends up in W0
and the remainder in W1. 16-bit signed and unsigned
DIV instructions can specify any W register for both the
16-bit divisor (Wn), and any W register (aligned) pair
(W(m + 1):Wm) for the 32-bit dividend. The divide algo-
rithm takes one cycle per bit of divisor, so both
32-bit/16-bit and 16-bit/16-bit instructions take the
same number of cycles to execute.
3.3.3 MULTI-BIT SHIFT SUPPORT
The PIC24F ALU supports both single bit and
single-cycle, multi-bit arithmetic and logic shifts.
Multi-bit shifts are implemented using a shifter block,
capable of performing up to a 15-bit arithmetic right
shift, or up to a 15-bit left shift, in a single cycle. All
multi-bit shift instructions only support Register Direct
Addressing for both the operand source and result
destination.
A full summary of instructions that use the shift
operation is provided in Table 3-2.
TABLE 3-2: INSTRUCTIONS THAT USE THE SINGLE BIT AND MULTI-BIT SHIFT OPERATION
Instruction Description
ASR Arithmetic shift right source register by one or more bits.
SL Shift left source register by one or more bits.
LSR Logical shift right source register by one or more bits.
2010 Microchip Technology Inc. DS39975A-page 43
PIC24FJ256GB210 FAMILY
4.0 MEMORY ORGANIZATION
As Harvard architecture devices, PIC24F micro-
controllers feature separate program and data memory
spaces and busses. This architecture also allows direct
access of program memory from the data space during
code execution.
4.1 Program Memory Space
The program address memory space of the
PIC24FJ256GB210 family devices is 4M instructions.
The space is addressable by a 24-bit value derived
from either the 23-bit Program Counter (PC) during pro-
gram execution, or from table operation or data space
remapping, as described in Section 4.3 “Interfacing
Program and Data Memory Spaces”.
User access to the program memory space is restricted
to the lower half of the address range (000000h to
7FFFFFh). The exception is the use of TBLRD/TBLWT
operations, which use TBLPAG<7> to permit access to
the Configuration bits and Device ID sections of the
configuration memory space.
Memory maps for the PIC24FJ256GB210 family of
devices are shown in Figure 4-1.
FIGURE 4-1: PROGRAM SPACE MEMORY MAP FOR PIC24FJ256GB210 FAMILY DEVICES
000000h
0000FEh
000002h
000100h
F8000Eh
F80010h
FEFFFEh
FFFFFEh
000004h
000200h
0001FEh
000104h
Reset Address
DEVID (2)
GOTO Instruction
Reserved
Alternate Vector Table
Reserved
Interrupt Vector Table
PIC24FJ128GB2XX
Configuration Memory Space User Memory Space
Flash Config Words
Note: Memory areas are not shown to scale.
FF0000h
F7FFFEh
F80000h
Device Config Registers
800000h
7FFFFEh
Reserved
02AC00h
02ABFEh
Unimplemented
Read ‘0’
Reset Address
Device Config Registers
User Flash
Program Memory
(87K instructions)
DEVID (2)
GOTO Instruction
Reserved
Alternate Vector Table
Reserved
Interrupt Vector Table
PIC24FJ256GB2XX
Reserved
Flash Config Words
Unimplemented
Read ‘0’
015800h
0157FEh
User Flash
Program Memory
(44K instructions)
PIC24FJ256GB210 FAMILY
DS39975A-page 44 2010 Microchip Technology Inc.
4.1.1 PROGRAM MEMORY
ORGANIZATION
The program memory space is organized in
word-addressable blocks. Although it is treated as
24 bits wide, it is more appropriate to think of each
address of the program memory as a lower and upper
word, with the upper byte of the upper word being
unimplemented. The lower word always has an even
address, while the upper word has an odd address
(Figure 4-2).
Program memory addresses are always word-aligned
on the lower word and addresses are incremented or
decremented by two during code execution. This
arrangement also provides compatibility with data
memory space addressing and makes it possible to
access data in the program memory space.
4.1.2 HARD MEMORY VECTORS
All PIC24F devices reserve the addresses between
0x00000 and 0x000200 for hard coded program execu-
tion vectors. A hardware Reset vector is provided to
redirect code execution from the default value of the
PC on device Reset to the actual start of code. A GOTO
instruction is programmed by the user at 0x000000 with
the actual address for the start of code at 0x000002.
PIC24F devices also have two interrupt vector tables,
located from 0x000004 to 0x0000FF and 0x000100 to
0x0001FF. These vector tables allow each of the many
device interrupt sources to be handled by separate ISRs.
A more detailed discussion of the interrupt vector tables
is provided in Section 7.1 “Interrupt Vector Table”.
4.1.3 FLASH CONFIGURATION WORDS
In PIC24FJ256GB210 family devices, the top four
words of on-chip program memory are reserved for
configuration information. On device Reset, the
configuration information is copied into the appropriate
Configuration register. The addresses of the Flash
Configuration Word for devices in the
PIC24FJ256GB210 family are shown in Table 4-1.
Their location in the memory map is shown with the
other memory vectors in Figure 4-1.
The Configuration Words in program memory are a
compact format. The actual Configuration bits are
mapped in several different registers in the configuration
memory space. Their order in the Flash Configuration
Words does not reflect a corresponding arrangement in
the configuration space. Additional details on the device
Configuration Words are provided in Section 26.1
“Configuration Bits”.
TABLE 4-1: FLASH CONFIGURATION
WORDS FOR
PIC24FJ256GB210 FAMILY
DEVICES
FIGURE 4-2: PROGRAM MEMORY ORGANIZATION
Device
Program
Memory
(Words)
Configuration Word
Addresses
PIC24FJ128GB2XX 44,032 0x0157F8:0x0157FE
PIC24FJ256GB2XX 87,552 0x02ABF8:0x02ABFE
0816
PC Address
0x000000
0x000002
0x000004
0x000006
23
00000000
00000000
00000000
00000000
Program Memory
‘Phantom’ Byte
(read as ‘0’)
least significant word
most significant word
Instruction Width
0x000001
0x000003
0x000005
0x000007
msw
Address (lsw Address)
2010 Microchip Technology Inc. DS39975A-page 45
PIC24FJ256GB210 FAMILY
4.2 Data Memory Space
The PIC24F core has a 16-bit wide data memory space,
addressable as a single linear range.
The data space is accessed using two Address Genera-
tion Units (AGUs), one each for read and write opera-
tions. The data space memory map is shown in
Figure 4-3.
The 16-bit wide data addresses in the data memory
space point to bytes within the Data Space (DS). This
gives a DS address range of 64 Kbytes or 32K words.
The lower 32 Kbytes (0x0000 to 0x7FFF) of DS is com-
patible with the PIC24F microcontrollers without EDS.
The upper 32 Kbytes of data memory address space
(0x8000 - 0xFFFF) are used as an EDS window.
The EDS window is used to access all memory region
implemented in EDS, as shown in Figure 4-4.
The EDS includes any additional internal data memory
not accessible by the lower 32-Kbyte data address
space and any external memory through EPMP. For
more details on accessing internal extended data
memory, refer to the “PIC24F Family Reference
Manual”, Section 45. “Data Memory with Extended
Data Space (EDS)” (DS39733). For more details on
accessing external memory using EPMP, refer to the
“PIC24F Family Reference Manual”, Section 42.
“Enhanced Parallel Master Port (EPMP)”
(DS39730). In PIC24F microcontrollers with EDS, the
program memory can also be read from EDS. This is
called Program Space Visibility (PSV). Table 4-2 lists
the total memory accessible by each of the devices in
this family.
The EDS is organized as pages, with a single page called
an EDS page that equals the EDS window (32 Kbytes).
A particular EDS page is selected through the Data
Space Read register (DSRPAG) or Data Space Write
register (DSWPAG). For PSV, only the DSRPAG register
is used. The combination of the DSRPAG register value
and the 16-bit wide data address forms a 24-bit Effective
Address (EA). For more information on EDS, refer to
Section 4.3.3 “Reading Data from Program Memory
Using EDS”.
Note: This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 45. “Data Memory with
Extended Data Space (EDS)” (DS39733).
The information in this data sheet
supersedes the information in the FRM.
TABLE 4-2: TOTAL MEMORY ACCESSIBLE BY THE DEVICE
Devices Internal RAM External RAM Access
Using EPMP
Program Memory Access
Using EDS
PIC24FJXXXGB210 96 Kbytes (30K + 66K(1)) Yes (up to 16 MB) Yes
PIC24FJXXXGB206 96 Kbytes (30K + 66K(1)) Yes (up to 64 KB) Yes
Note 1: The internal RAM above 30 Kbytes can be accessed through the EDS window.
PIC24FJ256GB210 FAMILY
DS39975A-page 46 2010 Microchip Technology Inc.
4.2.1 DATA SPACE WIDTH
The data memory space is organized in
byte-addressable, 16-bit wide blocks. Data is aligned
in data memory and registers as 16-bit words, but all
data space EAs resolve to bytes. The Least Significant
Bytes (LSBs) of each word have even addresses, while
the Most Significant Bytes (MSBs) have odd
addresses.
FIGURE 4-3: DATA SPACE MEMORY MAP FOR PIC24FJ256GB210 FAMILY DEVICES(1)
Note 1: Data memory areas are not shown to scale.
0000h
07FEh
FFFEh
LSB
Address
LSBMSB
MSB
Address
0001h
07FFh
1FFFh
FFFFh
8001h 8000h
7FFFh
0801h 0800h
2001h
Near
1FFEh
SFR
SFR Space
2000h
7FFEh
EDS Window
Space
Data Space
Lower 32 Kbytes
Data Space
EDS Page 0x1
EDS Page 0x2
EDS Page 0x3 (2 KB)
EDS Page 0x4
EDS Page 0x200
EDS Page 0x300
EDS Page 0x1FF
EDS Page 0x2FF
EDS Page 0x3FF
Internal Extended
Data RAM(66 Kbytes)
Program Space Visibility
Area to Access Lower
Word of Program Memory
EPMP Memory Space
Program Space Visibility
Area to Access Upper
Word of Program Memory
Upper 32 Kbytes
Data Space
(32 KB)
(32 KB)
30 Kbytes Data RAM
2010 Microchip Technology Inc. DS39975A-page 47
PIC24FJ256GB210 FAMILY
4.2.2 DATA MEMORY ORGANIZATION
AND ALIGNMENT
To maintain backward compatibility with PIC® MCUs and
improve data space memory usage efficiency, the
PIC24F instruction set supports both word and byte
operations. As a consequence of byte accessibility, all
EA calculations are internally scaled to step through
word-aligned memory. For example, the core recognizes
that Post-Modified Register Indirect Addressing mode
[Ws++] will result in a value of Ws + 1 for byte operations
and Ws + 2 for word operations.
Data byte reads will read the complete word, which
contains the byte, using the LSB of any EA to deter-
mine which byte to select. The selected byte is placed
onto the LSB of the data path. That is, data memory
and registers are organized as two parallel, byte-wide
entities with shared (word) address decode, but
separate write lines. Data byte writes only write to the
corresponding side of the array or register which
matches the byte address.
All word accesses must be aligned to an even address.
Misaligned word data fetches are not supported, so
care must be taken when mixing byte and word
operations or translating from 8-bit MCU code. If a
misaligned read or write is attempted, an address error
trap will be generated. If the error occurred on a read,
the instruction underway is completed; if it occurred on
a write, the instruction will be executed but the write will
not occur. In either case, a trap is then executed, allow-
ing the system and/or user to examine the machine
state prior to execution of the address Fault.
All byte loads into any W register are loaded into the
LSB. The Most Significant Byte (MSB) is not modified.
A Sign-Extend instruction (SE) is provided to allow
users to translate 8-bit signed data to 16-bit signed
values. Alternatively, for 16-bit unsigned data, users
can clear the MSB of any W register by executing a
Zero-Extend (ZE) instruction on the appropriate
address.
Although most instructions are capable of operating on
word or byte data sizes, it should be noted that some
instructions operate only on words.
4.2.3 NEAR DATA SPACE
The 8-Kbyte area between 0000h and 1FFFh is
referred to as the near data space. Locations in this
space are directly addressable via a 13-bit absolute
address field within all memory direct instructions. The
remainder of the data space is indirectly addressable.
Additionally, the whole data space is addressable using
MOV instructions, which support Memory Direct
Addressing with a 16-bit address field.
4.2.4 SPECIAL FUNCTION REGISTER
(SFR) SPACE
The first 2 Kbytes of the near data space, from 0000h
to 07FFh, are primarily occupied with Special Function
Registers (SFRs). These are used by the PIC24F core
and peripheral modules for controlling the operation of
the device.
SFRs are distributed among the modules that they con-
trol and are generally grouped together by module.
Much of the SFR space contains unused addresses;
these are read as ‘0’. A diagram of the SFR space,
showing where the SFRs are actually implemented, is
shown in Table 4-3. Each implemented area indicates
a 32-byte region where at least one address is imple-
mented as an SFR. A complete list of implemented
SFRs, including their addresses, is shown in Tables 4-4
throughTable 4-33.
TABLE 4-3: IMPLEMENTED REGIONS OF SFR DATA SPACE
SFR Space Address
xx00 xx20 xx40 xx60 xx80 xxA0 xxC0 xxE0
000h Core ICN Interrupts
100h Timers Capture Compare
200h I2C™ UART SPI/UART SPI/I2C SPI UART I/O
300h ADC/CTMU —————
400h ———— USB ANSEL
500h ————————
600h EPMP RTC/Comp CRC — PPS —
700h —— System NVM/PMD ————
Legend: — = There are no implemented SFRs in this block
PIC24FJ256GB210 FAMILY
DS39975A-page 48 2010 Microchip Technology Inc.
TABLE 4-4: CPU CORE REGISTERS MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
WREG0 0000 Working Register 0 0000
WREG1 0002 Working Register 1 0000
WREG2 0004 Working Register 2 0000
WREG3 0006 Working Register 3 0000
WREG4 0008 Working Register 4 0000
WREG5 000A Working Register 5 0000
WREG6 000C Working Register 6 0000
WREG7 000E Working Register 7 0000
WREG8 0010 Working Register 8 0000
WREG9 0012 Working Register 9 0000
WREG10 0014 Working Register 10 0000
WREG11 0016 Working Register 11 0000
WREG12 0018 Working Register 12 0000
WREG13 001A Working Register 13 0000
WREG14 001C Working Register 14 0000
WREG15 001E Working Register 15 0800
SPLIM 0020 Stack Pointer Limit Value Register xxxx
PCL 002E Program Counter Low Word Register 0000
PCH 0030 — — — — — — — — Program Counter Register High Byte 0000
DSRPAG 0032 — — — — — — Extended Data Space Read Page Address Register 0001
DSWPAG 0034 — — — — — — — Extended Data Space Write Page Address Register 0001
RCOUNT 0036 Repeat Loop Counter Register xxxx
SR 0042 — — — — — — — DC IPL2 IPL1 IPL0 RA N OV Z C 0000
CORCON 0044 — — — — — — — — — — — —IPL3 r — — 0004
DISICNT 0052 —— Disable Interrupts Counter Register xxxx
TBLPAG 0054 — — — — — — — — Table Memory Page Address Register 0000
Legend: — = unimplemented, read as ‘0’; r = Reserved. Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 49
PIC24FJ256GB210 FAMILY
TABLE 4-5: ICN REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
CNPD1 0056 CN15PDE CN14PDE CN13PDE CN12PDE CN11PDE CN10PDE CN9PDE CN8PDE CN7PDE CN6PDE CN5PDE CN4PDE CN3PDE CN2PDE CN1PDE CN0PDE
0000
CNPD2 0058 CN31PDE CN30PDE CN29PDE CN28PDE CN27PDE CN26PDE CN25PDE CN24PDE CN23PDE CN22PDE CN21PDE
(1)
CN20PDE
(1)
CN19PDE
(1)
CN18PDE CN17PDE CN16PDE
0000
CNPD3 005A CN47PDE
(1)
CN46PDE
(1)
CN45PDE
(1)
CN44PDE
(1)
CN43PDE
(1)
CN42PDE
(1)
CN41PDE
(1)
CN40PDE
(1)
CN39PDE
(1)
CN38PDE
(1)
CN37PDE
(1)
CN36PDE
(1)
CN35PDE
(1)
CN34PDE
(1)
CN33PDE
(1)
CN32PDE
0000
CNPD4 005C CN63PDE CN62PDE CN61PDE CN60PDE CN59PDE CN58PDE CN57PDE
(1)
CN56PDE CN55PDE CN54PDE CN53PDE CN52PDE CN51PDE CN50PDE CN49PDE CN48PDE
(1)
0000
CNPD5 005E CN79PDE
(1)
CN78PDE
(1)
CN77PDE
(1)
CN76PDE
(1)
CN75PDE
(1)
CN74PDE
(1)
CN73PDE
(1)
— CN71PDE CN70PDE
(1)
CN69PDE CN68PDE CN67PDE
(1)
CN66PDE
(1)
CN65PDE CN64PDE
0000
CNPD6 0060 — — — — — — — — — — — CN84PDE CN83PDE CN82PDE
(1)
CN81PDE
(1)
CN80PDE
(1)
0000
CNEN1 0062 CN15IE CN14IE CN13IE CN12IE CN11IE CN10IE CN9IE CN8IE CN7IE CN6IE CN5IE CN4IE CN3IE CN2IE CN1IE CN0IE
0000
CNEN2 0064 CN31IE CN30IE CN29IE CN28IE CN27IE CN26IE CN25IE CN24IE CN23IE CN22IE CN21IE
(1)
CN20IE
(1)
CN19IE
(1)
CN18IE CN17IE CN16IE
0000
CNEN3 0066 CN47IE
(1)
CN46IE
(1)
CN45IE
(1)
CN44IE
(1)
CN43IE
(1)
CN42IE
(1)
CN41IE
(1)
CN40IE
(1)
CN39IE
(1)
CN38IE
(1)
CN37IE
(1)
CN36IE
(1)
CN35IE
(1)
CN34IE
(1)
CN33IE
(1)
CN32IE
0000
CNEN4 0068 CN63IE CN62IE CN61IE CN60IE CN59IE CN58IE CN57IE
(1)
CN56IE CN55IE CN54IE CN53IE CN52IE CN51IE CN50IE CN49IE CN48IE
(1)
0000
CNEN5 006A CN79IE
(1)
CN78IE
(1)
CN77IE
(1)
CN76IE
(1)
CN75IE
(1)
CN74IE
(1)
CN73IE
(1)
— CN71IE CN70IE
(1)
CN69IE CN68IE CN67IE
(1)
CN66IE
(1)
CN65IE CN64IE
0000
CNEN6 006C — — — — — — — — — — — CN84IE CN83IE CN82IE
(1)
CN81IE
(1)
CN80IE
(1)
0000
CNPU1 006E CN15PUE CN14PUE CN13PUE CN12PUE CN11PUE CN10PUE CN9PUE CN8PUE CN7PUE CN6PUE CN5PUE CN4PUE CN3PUE CN2PUE CN1PUE CN0PUE
0000
CNPU2 0070 CN31PUE CN30PUE CN29PUE CN28PUE CN27PUE CN26PUE CN25PUE CN24PUE CN23PUE CN22PUE CN21PUE
(1)
CN20PUE
(1)
CN19PUE
(1)
CN18PUE CN17PUE CN16PUE
0000
CNPU3 0072 CN47PUE
(1)
CN46PUE
(1)
CN45PUE
(1)
CN44PUE
(1)
CN43PUE
(1)
CN42PUE
(1)
CN41PUE
(1)
CN40PUE
(1)
CN39PUE
(1)
CN38PUE
(1)
CN37PUE
(1)
CN36PUE
(1)
CN35PUE
(1)
CN34PUE
(1)
CN33PUE
(1)
CN32PUE
0000
CNPU4 0074 CN63PUE CN62PUE CN61PUE CN60PUE CN59PUE CN58PUE CN57PUE
(1)
CN56PUE CN55PUE CN54PUE CN53PUE CN52PUE CN51PUE CN50PUE CN49PUE CN48PUE
(1)
0000
CNPU5 0076 CN79PUE
(1)
CN78PUE
(1)
CN77PUE
(1)
CN76PUE
(1)
CN75PUE
(1)
CN74PUE
(1)
CN73PUE
(1)
— CN71PUE CN70PUE
(1)
CN69PUE CN68PUE CN67PUE
(1)
CN66PUE
(1)
CN65PUE CN64PUE
0000
CNPU6 0078 — — — — — — — — — — — CN84PUE CN83PUE CN82PUE
(1)
CN81PUE
(1)
CN80PUE
(1)
0000
Legend:
— = unimplemented, read as ‘
0
’. Reset values are shown in hexadecimal.
Note 1:
Unimplemented in 64-pin devices; read as ‘
0
’.
PIC24FJ256GB210 FAMILY
DS39975A-page 50 2010 Microchip Technology Inc.
TABLE 4-6: INTERRUPT CONTROLLER REGISTER MAP
File Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
INTCON1 0080 NSTDIS — — — — — — — — — — MATHERR ADDRERR STKERR OSCFAIL —
0000
INTCON2 0082 ALTIVT DISI — — — — — — — — — INT4EP INT3EP INT2EP INT1EP INT0EP
0000
IFS0 0084 —— AD1IF U1TXIF U1RXIF SPI1IF SPF1IF T3IF T2IF OC2IF IC2IF — T1IF OC1IF IC1IF INT0IF
0000
IFS1 0086 U2TXIF U2RXIF INT2IF T5IF T4IF OC4IF OC3IF — IC8IF IC7IF — INT1IF CNIF CMIF MI2C1IF SI2C1IF
0000
IFS2 0088 —— PMPIF OC8IF OC7IF OC6IF OC5IF IC6IF IC5IF IC4IF IC3IF — — —SPI2IFSPF2IF
0000
IFS3 008A —RTCIF — — — — — — — INT4IF INT3IF —— MI2C2IF SI2C2IF —
0000
IFS4 008C ——CTMUIF— — — —LVDIF— — — — CRCIF U2ERIF U1ERIF —
0000
IFS5 008E —— IC9IF OC9IF SPI3IF SPF3IF U4TXIF U4RXIF U4ERIF USB1IF MI2C3IF SI2C3IF U3TXIF U3RXIF U3ERIF —
0000
IEC0 0094 —— AD1IE U1TXIE U1RXIE SPI1IE SPF1IE T3IE T2IE OC2IE IC2IE — T1IE OC1IE IC1IE INT0IE
0000
IEC1 0096 U2TXIE U2RXIE INT2IE T5IE T4IE OC4IE OC3IE — IC8IE IC7IE — INT1IE CNIE CMIE MI2C1IE SI2C1IE
0000
IEC2 0098 —— PMPIE OC8IE OC7IE OC6IE OC5IE IC6IE IC5IE IC4IE IC3IE — — — SPI2IE SPF2IE
0000
IEC3 009A —RTCIE — — — — — — — INT4IE INT3IE —— MI2C2IE SI2C2IE —
0000
IEC4 009C ——CTMUIE— — — —LVDIE— — — — CRCIE U2ERIE U1ERIE —
0000
IEC5 009E —— IC9IE OC9IE SPI3IE SPF3IE U4TXIE U4RXIE U4ERIE USB1IE MI2C3IE SI2C3IE U3TXIE U3RXIE U3ERIE —
0000
IPC0 00A4 — T1IP2 T1IP1 T1IP0 — OC1IP2 OC1IP1 OC1IP0 — IC1IP2 IC1IP1 IC1IP0 — INT0IP2 INT0IP1 INT0IP0
4444
IPC1 00A6 — T2IP2 T2IP1 T2IP0 — OC2IP2 OC2IP1 OC2IP0 — IC2IP2 IC2IP1 IC2IP0 — — — —
4440
IPC2 00A8 — U1RXIP2 U1RXIP1 U1RXIP0 — SPI1IP2 SPI1IP1 SPI1IP0 — SPF1IP2 SPF1IP1 SPF1IP0 —T3IP2T3IP1T3IP0
4444
IPC3 00AA — — — — — — — — — AD1IP2 AD1IP1 AD1IP0 — U1TXIP2 U1TXIP1 U1TXIP0
0044
IPC4 00AC — CNIP2 CNIP1 CNIP0 —CMIP2CMIP1CMIP0— MI2C1IP2 MI2C1IP1 MI2C1IP0 — SI2C1IP2 SI2C1IP1 SI2C1IP0
4444
IPC5 00AE — IC8IP2 IC8IP1 IC8IP0 — IC7IP2 IC7IP1 IC7IP0 — — — — — INT1IP2 INT1IP1 INT1IP0
4404
IPC6 00B0 — T4IP2 T4IP1 T4IP0 — OC4IP2 OC4IP1 OC4IP0 — OC3IP2 OC3IP1 OC3IP0 — — — —
4440
IPC7 00B2 — U2TXIP2 U2TXIP1 U2TXIP0 — U2RXIP2 U2RXIP1 U2RXIP0 — INT2IP2 INT2IP1 INT2IP0 —T5IP2T5IP1T5IP0
4444
IPC8 00B4 — — — — — — — — — SPI2IP2 SPI2IP1 SPI2IP0 — SPF2IP2 SPF2IP1 SPF2IP0
0044
IPC9 00B6 — IC5IP2 IC5IP1 IC5IP0 — IC4IP2 IC4IP1 IC4IP0 — IC3IP2 IC3IP1 IC3IP0 — — — —
4440
IPC10 00B8 — OC7IP2 OC7IP1 OC7IP0 — OC6IP2 OC6IP1 OC6IP0 — OC5IP2 OC5IP1 OC5IP0 — IC6IP2 IC6IP1 IC6IP0
4444
IPC11 00BA — — — — — — — — — PMPIP2 PMPIP1 PMPIP0 — OC8IP2 OC8IP1 OC8IP0
0044
IPC12 00BC — — — — — MI2C2IP2 MI2C2IP1 MI2C2IP0 — SI2C2IP2 SI2C2IP1 SI2C2IP0 — — — —
0440
IPC13 00BE — — — — — INT4IP2 INT4IP1 INT4IP0 — INT3IP2 INT3IP1 INT3IP0 — — — —
0440
IPC15 00C2 — — — — — RTCIP2 RTCIP1 RTCIP0 — — — — — — — —
0400
Legend:
— = unimplemented, read as ‘
0
’. Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 51
PIC24FJ256GB210 FAMILY
IPC16 00C4 — CRCIP2 CRCIP1 CRCIP0 — U2ERIP2 U2ERIP1 U2ERIP0 — U1ERIP2 U1ERIP1 U1ERIP0 — — — —
4440
IPC18 00C8 — — — — — — — — — — — — — LVDIP2 LVDIP1 LVDIP0
0004
IPC19 00CA — — — — — — — — — CTMUIP2 CTMUIP1 CTMUIP0 — — — —
0040
IPC20 00CC — U3TXIP2 U3TXIP1 U3TXIP0 — U3RXIP2 U3RXIP1 U3RXIP0 — U3ERIP2 U3ERIP1 U3ERIP0 — — — —
4440
IPC21 00CE — U4ERIP2 U4ERIP1 U4ERIP0 — USB1IP2 USB1IP1 USB1IP0 — MI2C3IP2 MI2C3IP1 MI2C3IP0 — SI2C3IP2 SI2C3IP1 SI2C3IP0
4444
IPC22 00D0 — SPI3IP2 SPI3IP1 SPI3IP0 — SPF3IP2 SPF3IP1 SPF3IP0 — U4TXIP2 U4TXIP1 U4TXIP0 — U4RXIP2 U4RXIP1 U4RXIP0
4444
IPC23 00D2 — — — — — — — — — IC9IP2 IC9IP1 IC9IP0 — OC9IP2 OC9IP1 OC9IP0
0044
INTTREG 00E0 CPUIRQ —VHOLD— ILR3 ILR2 ILR1 ILR0 — VECNUM6 VECNUM5 VECNUM4 VECNUM3 VECNUM2 VECNUM1 VECNUM0
0000
TABLE 4-6: INTERRUPT CONTROLLER REGISTER MAP (CONTINUED)
File Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
Legend:
— = unimplemented, read as ‘
0
’. Reset values are shown in hexadecimal.
TABLE 4-7: TIMER REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
TMR1 0100 Timer1 Register 0000
PR1 0102 Timer1 Period Register FFFF
T1CON 0104 TON —TSIDL—————— TGATE TCKPS1 TCKPS0 — TSYNC TCS —0000
TMR2 0106 Timer2 Register 0000
TMR3HLD 0108 Timer3 Holding Register (for 32-bit timer operations only) 0000
TMR3 010A Timer3 Register 0000
PR2 010C Timer2 Period Register FFFF
PR3 010E Timer3 Period Register FFFF
T2CON 0110 TON —TSIDL—————— TGATE TCKPS1 TCKPS0 T32 —TCS—0000
T3CON 0112 TON —TSIDL—————— TGATE TCKPS1 TCKPS0 ——TCS—0000
TMR4 0114 Timer4 Register 0000
TMR5HLD 0116 Timer5 Holding Register (for 32-bit operations only) 0000
TMR5 0118 Timer5 Register 0000
PR4 011A Timer4 Period Register FFFF
PR5 011C Timer5 Period Register FFFF
T4CON 011E TON —TSIDL—————— TGATE TCKPS1 TCKPS0 T45 —TCS—0000
T5CON 0120 TON —TSIDL—————— TGATE TCKPS1 TCKPS0 ——TCS—0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
PIC24FJ256GB210 FAMILY
DS39975A-page 52 2010 Microchip Technology Inc.
TABLE 4-8: INPUT CAPTURE REGISTER MAP
File Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
IC1CON1 0140 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC1CON2 0142 — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC1BUF 0144 Input Capture 1 Buffer Register 0000
IC1TMR 0146 Input Capture 1 Timer Value Register xxxx
IC2CON1 0148 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC2CON2 014A — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC2BUF 014C Input Capture 2 Buffer Register 0000
IC2TMR 014E Input Capture 2 Timer Value Register xxxx
IC3CON1 0150 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC3CON2 0152 — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC3BUF 0154 Input Capture 3 Buffer Register 0000
IC3TMR 0156 Input Capture 3 Timer Value Register xxxx
IC4CON1 0158 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC4CON2 015A — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC4BUF 015C Input Capture 4 Buffer Register 0000
IC4TMR 015E Input Capture 4 Timer Value Register xxxx
IC5CON1 0160 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC5CON2 0162 — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC5BUF 0164 Input Capture 5 Buffer Register 0000
IC5TMR 0166 Input Capture 5 Timer Value Register xxxx
IC6CON1 0168 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC6CON2 016A — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC6BUF 016C Input Capture 6 Buffer Register 0000
IC6TMR 016E Input Capture 6 Timer Value Register xxxx
IC7CON1 0170 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC7CON2 0172 — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC7BUF 0174 Input Capture 7 Buffer Register 0000
IC7TMR 0176 Input Capture 7 Timer Value Register xxxx
IC8CON1 0178 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC8CON2 017A — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC8BUF 017C Input Capture 8 Buffer Register 0000
IC8TMR 017E Input Capture 8 Timer Value Register xxxx
IC9CON1 0180 —— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — — — ICI1 ICI0 ICOV ICBNE ICM2 ICM1 ICM0 0000
IC9CON2 0182 — — — — — — — IC32 ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0 000D
IC9BUF 0184 Input Capture 9 Buffer Register 0000
IC9TMR 0186 Input Capture 9 Timer Value Register xxxx
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 53
PIC24FJ256GB210 FAMILY
TABLE 4-9: OUTPUT COMPARE REGISTER MAP
File Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
OC1CON1 0190 —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC1CON2 0192 FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC1RS 0194 Output Compare 1 Secondary Register
0000
OC1R 0196 Output Compare 1 Register
0000
OC1TMR 0198 Output Compare 1 Timer Value Register
xxxx
OC2CON1 019A —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC2CON2 019C FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC2RS 019E Output Compare 2 Secondary Register
0000
OC2R 01A0 Output Compare 2 Register
0000
OC2TMR 01A2 Output Compare 2 Timer Value Register
xxxx
OC3CON1 01A4 —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC3CON2 01A6 FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC3RS 01A8 Output Compare 3 Secondary Register
0000
OC3R 01AA Output Compare 3 Register
0000
OC3TMR 01AC Output Compare 3 Timer Value Register
xxxx
OC4CON1 01AE —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC4CON2 01B0 FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC4RS 01B2 Output Compare 4 Secondary Register
0000
OC4R 01B4 Output Compare 4 Register
0000
OC4TMR 01B6 Output Compare 4 Timer Value Register
xxxx
OC5CON1 01B8 —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT1 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC5CON2 01BA FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC5RS 01BC Output Compare 5 Secondary Register
0000
OC5R 01BE Output Compare 5 Register
0000
OC5TMR 01C0 Output Compare 5 Timer Value Register
xxxx
OC6CON1 01C2 —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC6CON2 01C4 FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC6RS 01C6 Output Compare 6 Secondary Register
0000
OC6R 01C8 Output Compare 6 Register
0000
OC6TMR 01CA Output Compare 6 Timer Value Register
xxxx
OC7CON1 01CC —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC7CON2 01CE FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC7RS 01D0 Output Compare 7 Secondary Register
0000
OC7R 01D2 Output Compare 7 Register
0000
OC7TMR 01D4 Output Compare 7 Timer Value Register
xxxx
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
PIC24FJ256GB210 FAMILY
DS39975A-page 54 2010 Microchip Technology Inc.
OC8CON1 01D6 —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC8CON2 01D8 FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC8RS 01DA Output Compare 8 Secondary Register
0000
OC8R 01DC Output Compare 8 Register
0000
OC8TMR 01DE Output Compare 8 Timer Value Register
xxxx
OC9CON1 01E0 —— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2 ENFLT1 ENFLT0 OCFLT2 OCFLT1 OCFLT0 TRIGMODE OCM2 OCM1 OCM0
0000
OC9CON2 01E2 FLTMD FLTOUT FLTTRIEN OCINV — DCB1 DCB0 OC32 OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
000C
OC9RS 01E4 Output Compare 9 Secondary Register
0000
OC9R 01E6 Output Compare 9 Register
0000
OC9TMR 01E8 Output Compare 9 Timer Value Register
xxxx
TABLE 4-9: OUTPUT COMPARE REGISTER MAP (CONTINUED)
File Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
TABLE 4-10: I2C™ REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
I2C1RCV 0200 — — — — — — — — I2C1 Receive Register 0000
I2C1TRN 0202 — — — — — — — — I2C1 Transmit Register 00FF
I2C1BRG 0204 — — — — — — — I2C1 Baud Rate Generator Register 0000
I2C1CON 0206 I2CEN — I2CSIDL SCLREL IPMIEN A10M DISSLW SMEN GCEN STREN ACKDT ACKEN RCEN PEN RSEN SEN 1000
I2C1STAT 0208 ACKSTAT TRSTAT — — — BCL GCSTAT ADD10 IWCOL I2COV D/A PSR/WRBF TBF 0000
I2C1ADD 020A — — — — — — I2C1 Address Register 0000
I2C1MSK 020C — — — — — — I2C1 Address Mask Register 0000
I2C2RCV 0210 — — — — — — — — I2C2 Receive Register 0000
I2C2TRN 0212 — — — — — — — — I2C2 Transmit Register 00FF
I2C2BRG 0214 — — — — — — — I2C2 Baud Rate Generator Register 0000
I2C2CON 0216 I2CEN — I2CSIDL SCLREL IPMIEN A10M DISSLW SMEN GCEN STREN ACKDT ACKEN RCEN PEN RSEN SEN 1000
I2C2STAT 0218 ACKSTAT TRSTAT — — — BCL GCSTAT ADD10 IWCOL I2COV D/A PSR/WRBF TBF 0000
I2C2ADD 021A — — — — — — I2C2 Address Register 0000
I2C2MSK 021C — — — — — — I2C2 Address Mask Register 0000
I2C3RCV 0270 — — — — — — — — I2C3 Receive Register 0000
I2C3TRN 0272 — — — — — — — — I2C3 Transmit Register 00FF
I2C3BRG 0274 — — — — — — — I2C3 Baud Rate Generator Register 0000
I2C3CON 0276 I2CEN — I2CSIDL SCLREL IPMIEN A10M DISSLW SMEN GCEN STREN ACKDT ACKEN RCEN PEN RSEN SEN 1000
I2C3STAT 0278 ACKSTAT TRSTAT — — — BCL GCSTAT ADD10 IWCOL I2COV D/A PSR/WRBF TBF 0000
I2C3ADD 027A — — — — — — I2C3 Address Register 0000
I2C3MSK 027C — — — — — — I2C3 Address Mask Register 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 55
PIC24FJ256GB210 FAMILY
TABLE 4-11: UART REGISTER MAPS
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
U1MODE 0220 UARTEN — USIDL IREN RTSMD — UEN1 UEN0 WAKE LPBACK ABAUD RXINV BRGH PDSEL1 PDSEL0 STSEL 0000
U1STA 0222 UTXISEL1 UTXINV UTXISEL0 — UTXBRK UTXEN UTXBF TRMT URXISEL1 URXISEL0 ADDEN RIDLE PERR FERR OERR URXDA 0110
U1TXREG 0224 — — — — — — — UART1 Transmit Register xxxx
U1RXREG 0226 — — — — — — — UART1 Receive Register 0000
U1BRG 0228 UART1 Baud Rate Generator Prescaler Register 0000
U2MODE 0230 UARTEN — USIDL IREN RTSMD — UEN1 UEN0 WAKE LPBACK ABAUD RXINV BRGH PDSEL1 PDSEL0 STSEL 0000
U2STA 0232 UTXISEL1 UTXINV UTXISEL0 — UTXBRK UTXEN UTXBF TRMT URXISEL1 URXISEL0 ADDEN RIDLE PERR FERR OERR URXDA 0110
U2TXREG 0234 — — — — — — — UART2 Transmit Register xxxx
U2RXREG 0236 — — — — — — — UART2 Receive Register 0000
U2BRG 0238 UART2 Baud Rate Generator Prescaler Register 0000
U3MODE 0250 UARTEN — USIDL IREN RTSMD — UEN1 UEN0 WAKE LPBACK ABAUD RXINV BRGH PDSEL1 PDSEL0 STSEL 0000
U3STA 0252 UTXISEL1 UTXINV UTXISEL0 — UTXBRK UTXEN UTXBF TRMT URXISEL1 URXISEL0 ADDEN RIDLE PERR FERR OERR URXDA 0110
U3TXREG 0254 — — — — — — — UART3 Transmit Register xxxx
U3RXREG 0256 — — — — — — — UART3 Receive Register 0000
U3BRG 0258 UART3 Baud Rate Generator Prescaler Register 0000
U4MODE 02B0 UARTEN — USIDL IREN RTSMD — UEN1 UEN0 WAKE LPBACK ABAUD RXINV BRGH PDSEL1 PDSEL0 STSEL 0000
U4STA 02B2 UTXISEL1 UTXINV UTXISEL0 — UTXBRK UTXEN UTXBF TRMT URXISEL1 URXISEL0 ADDEN RIDLE PERR FERR OERR URXDA 0110
U4TXREG 02B4 — — — — — — — UART4 Transmit Register xxxx
U4RXREG 02B6 — — — — — — — UART4 Receive Register 0000
U4BRG 02B8 UART4 Baud Rate Generator Prescaler Register 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
PIC24FJ256GB210 FAMILY
DS39975A-page 56 2010 Microchip Technology Inc.
TABLE 4-12: SPI REGISTER MAPS
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
SPI1STAT 0240 SPIEN — SPISIDL —— SPIBEC2 SPIBEC1 SPIBEC0 SRMPT SPIROV SRXMPT SISEL2 SISEL1 SISEL0 SPITBF SPIRBF 0000
SPI1CON1 0242 ——— DISSCK DISSDO MODE16 SMP CKE SSEN CKP MSTEN SPRE2 SPRE1 SPRE0 PPRE1 PPRE0 0000
SPI1CON2 0244 FRMEN SPIFSD SPIFPOL — — — — — — — — — — — SPIFE SPIBEN 0000
SPI1BUF 0248 SPI1 Transmit and Receive Buffer 0000
SPI2STAT 0260 SPIEN — SPISIDL —— SPIBEC2 SPIBEC1 SPIBEC0 SRMPT SPIROV SRXMPT SISEL2 SISEL1 SISEL0 SPITBF SPIRBF 0000
SPI2CON1 0262 ——— DISSCK DISSDO MODE16 SMP CKE SSEN CKP MSTEN SPRE2 SPRE1 SPRE0 PPRE1 PPRE0 0000
SPI2CON2 0264 FRMEN SPIFSD SPIFPOL — — — — — — — — — — — SPIFE SPIBEN 0000
SPI2BUF 0268 SPI2 Transmit and Receive Buffer 0000
SPI3STAT 0280 SPIEN — SPISIDL —— SPIBEC2 SPIBEC1 SPIBEC0 SRMPT SPIROV SRXMPT SISEL2 SISEL1 SISEL0 SPITBF SPIRBF 0000
SPI3CON1 0282 ——— DISSCK DISSDO MODE16 SMP CKE SSEN CKP MSTEN SPRE2 SPRE1 SPRE0 PPRE1 PPRE0 0000
SPI3CON2 0284 FRMEN SPIFSD SPIFPOL — — — — — — — — — — — SPIFE SPIBEN 0000
SPI3BUF 0288 SPI3 Transmit and Receive Buffer 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
TABLE 4-13: PORTA REGISTER MAP(1)
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit2 Bit 1 Bit 0 All
Resets
TRISA 02C0 TRISA15 TRISA14 ——— TRISA10 TRISA9 — TRISA7 TRISA6 TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 C6FF
PORTA 02C2 RA15 RA14 ——— RA10 RA9 — RA7 RA6 RA5 RA4 RA3 RA2 RA1 RA0 xxxx
LATA 02C4 LATA15 LATA14 ——— LATA10 LATA9 — LATA7 LATA6 LATA5 LATA4 LATA3 LATA2 LATA1 LATA0 xxxx
ODCA 02C6 ODA15 ODA14 ———ODA10ODA9 — ODA7 ODA6 ODA5 ODA4 ODA3 ODA2 ODA1 ODA0 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal. Reset values shown are for 100-pin devices.
Note 1: PORTA and all associated bits are unimplemented on 64-pin devices and read as ‘0’. Bits are available on 100-pin devices only, unless otherwise noted.
TABLE 4-14: PORTB REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
TRISB 02C8 TRISB15 TRISB14 TRISB13 TRISB12 TRISB11 TRISB10 TRISB9 TRISB8 TRISB7 TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 FFFF
PORTB 02CA RB15 RB14 RB13 RB12 RB11 RB10 RB9 RB8 RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0 xxxx
LATB 02CC LATB15 LATB14 LATB13 LATB12 LATB11 LATB10 LATB9 LATB8 LATB7 LATB6 LATB5 LATB4 LATB3 LATB2 LATB1 LATB0 xxxx
ODCB 02CE ODB15 ODB14 ODB13 ODB12 ODB11 ODB10 ODB9 ODB8 ODB7 ODB6 ODB5 ODB4 ODB3 ODB2 ODB1 ODB0 0000
Legend: Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 57
PIC24FJ256GB210 FAMILY
TABLE 4-15: PORTC REGISTER MAP
File Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4(1) Bit 3(1) Bit 2(1) Bit 1(1) Bit 0 All
Resets
TRISC 02D0 TRISC15 TRISC14 TRISC13 TRISC12 — — — — — — — TRISC4 TRISC3 TRISC2 TRISC1 — F01E
PORTC 02D2 RC15(2,3) RC14 RC13 RC12(2) — — — — — — — RC4 RC3 RC2 RC1 —xxxx
LATC 02D4 LATC15 LATC14 LATC13 LATC12 — — — — — — — LATC4 LATC3 LATC2 LATC1 —xxxx
ODCC 02D6 ODC15 ODC14 ODC13 ODC12 — — — — — — — ODC4 ODC3 ODC2 ODC1 —0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal. Reset values shown are for 100-pin devices.
Note 1: Bits are unimplemented in 64-pin devices; read as ‘0’.
2: RC12 and RC15 are only available when the primary oscillator is disabled or when EC mode is selected (POSCMD<1:0> Configuration bits = 11 or 00); otherwise read as ‘0’.
3: RC15 is only available when the POSCMD<1:0> Configuration bits = 11 or 00 and the OSCIOFN Configuration bit = 1.
TABLE 4-16: PORTD REGISTER MAP
File
Name Addr Bit 15(1) Bit 14(1) Bit 13(1) Bit 12(1) Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
TRISD 02D8 TRISD15 TRISD14 TRISD13 TRISD12 TRISD11 TRISD10 TRISD9 TRISD8 TRISD7 TRISD6 TRISD5 TRISD4 TRISD3 TRISD2 TRISD1 TRISD0 FFFF
PORTD 02DA RD15 RD14 RD13 RD12 RD11 RD10 RD9 RD8 RD7 RD6 RD5 RD4 RD3 RD2 RD1 RD0 xxxx
LATD 02DC LATD15 LATD14 LATD13 LATD12 LATD11 LATD10 LATD9 LATD8 LATD7 LATD6 LATD5 LATD4 LATD3 LATD2 LATD1 LATD0 xxxx
ODCD 02DE ODD15 ODD14 ODD13 ODD12 ODD11 ODD10 ODD9 ODD8 ODD7 ODD6 ODD5 ODD4 ODD3 ODD2 ODD1 ODD0 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal. Reset values shown are for 100-pin devices.
Note 1: Bits are unimplemented in 64-pin devices; read as ‘0’.
TABLE 4-17: PORTE REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9(1) Bit 8(1) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
TRISE 02E0 —————— TRISE9 TRISE8 TRISE7 TRISE6 TRISE5 TRISE4 TRISE3 TRISE2 TRISE1 TRISE0 03FF
PORTE 02E2 —————— RE9RE8RE7RE6RE5RE4RE3RE2RE1RE0xxxx
LATE 02E4 —————— LATE9 LATE8 LATE7 LATE6 LATE5 LATE4 LATE3 LATE2 LATE1 LATE0 xxxx
ODCE 02E6 —————— ODE9ODE8ODE7ODE6ODE5ODE4ODE3ODE2ODE1ODE00000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal. Reset values shown are for 100-pin devices.
Note 1: Bits are unimplemented in 64-pin devices; read as ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 58 2010 Microchip Technology Inc.
TABLE 4-18: PORTF REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13(1) Bit 12(1) Bit 11 Bit 10 Bit 9 Bit 8(1) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2(1) Bit 1 Bit 0 All
Resets
TRISF 02E8 ——TRISF13TRISF12———TRISF8TRISF7— TRISF5 TRISF4 TRISF3 TRISF2 TRISF1 TRISF0 31BF
PORTF 02EA —— RF13 RF12 ———RF8RF7— RF5RF4RF3RF2RF1RF0xxxx
LATF 02EC —— LATF13 LATF12 ——— LATF8 LATF7 — LATF5 LATF4 LATF3 LATF2 LATF1 LATF0 xxxx
ODCF 02EE ——ODF13ODF12——— ODF8 ODF7 — ODF5 ODF4 ODF3 ODF2 ODF1 ODF0 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal. Reset values shown are for 100-pin devices.
Note 1: Bits are unimplemented in 64-pin devices; read as ‘0’.
TABLE 4-19: PORTG REGISTER MAP
File
Name Addr Bit 15(1) Bit 14(1) Bit 13(1) Bit 12(1) Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1(1) Bit 0(1) All
Resets
TRISG 02F0 TRISG15 TRISG14 TRISG13 TRISG12 —— TRISG9 TRISG8 TRISG7 TRISG6 —— TRISG3 TRISG2 TRISG1 TRISG0 F3CF
PORTG 02F2 RG15 RG14 RG13 RG12 —— RG9 RG8 RG7 RG6 — — RG3 RG2 RG1 RG0 xxxx
LATG 02F4 LATG15 LATG14 LATG13 LATG12 —— LATG9 LATG8 LATG7 LATG6 —— LATG 3 LATG2 LATG1 LATG0 xxxx
ODCG 02F6 ODG15 ODG14 ODG13 ODG12 — — ODG9 ODG8 ODG7 ODG6 — — ODG3 ODG2 ODG1 ODG0 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal. Reset values shown are for 100-pin devices.
Note 1: Bits are unimplemented in 64-pin devices; read as ‘0’.
TABLE 4-20: PAD CONFIGURATION REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
PADCFG1 02FC — — — — — — — — — — — — — — RTSECSEL PMPTTL 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 59
PIC24FJ256GB210 FAMILY
TABLE 4-21: ADC REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
ADC1BUF0 0300 ADC Data Buffer 0 xxxx
ADC1BUF1 0302 ADC Data Buffer 1 xxxx
ADC1BUF2 0304 ADC Data Buffer 2 xxxx
ADC1BUF3 0306 ADC Data Buffer 3 xxxx
ADC1BUF4 0308 ADC Data Buffer 4 xxxx
ADC1BUF5 030A ADC Data Buffer 5 xxxx
ADC1BUF6 030C ADC Data Buffer 6 xxxx
ADC1BUF7 030E ADC Data Buffer 7 xxxx
ADC1BUF8 0310 ADC Data Buffer 8 xxxx
ADC1BUF9 0312 ADC Data Buffer 9 xxxx
ADC1BUFA 0314 ADC Data Buffer 10 xxxx
ADC1BUFB 0316 ADC Data Buffer 11 xxxx
ADC1BUFC 0318 ADC Data Buffer 12 xxxx
ADC1BUFD 031A ADC Data Buffer 13 xxxx
ADC1BUFE 031C ADC Data Buffer 14 xxxx
ADC1BUFF 031E ADC Data Buffer 15 xxxx
ADC1BUF10 0340 ADC Data Buffer 16 xxxx
ADC1BUF11 0342 ADC Data Buffer 17 xxxx
ADC1BUF12 0344 ADC Data Buffer 18 xxxx
ADC1BUF13 0346 ADC Data Buffer 19 xxxx
ADC1BUF14 0348 ADC Data Buffer 20 xxxx
ADC1BUF15 034A ADC Data Buffer21 xxxx
ADC1BUF16 034C ADC Data Buffer 22 xxxx
ADC1BUF17 034E ADC Data Buffer 23 xxxx
ADC1BUF18 0350 ADC Data Buffer 24 xxxx
ADC1BUF19 0352 ADC Data Buffer 25 xxxx
ADC1BUF1A 0354 ADC Data Buffer 26 xxxx
ADC1BUF1B 0356 ADC Data Buffer 27 xxxx
ADC1BUF1C 0358 ADC Data Buffer 28 xxxx
ADC1BUF1D 035A ADC Data Buffer 29 xxxx
ADC1BUF1E 035C ADC Data Buffer 30 xxxx
ADC1BUF1F 035E ADC Data Buffer 31 xxxx
Legend: — = unimplemented, read as ‘0’, r = Reserved, maintain as ‘0’. Reset values are shown in hexadecimal.
Note 1: Unimplemented in 64-pin devices, read as ‘0’
PIC24FJ256GB210 FAMILY
DS39975A-page 60 2010 Microchip Technology Inc.
AD1CON1 0320 ADON — ADSIDL — — — FORM1 FORM0 SSRC2 SSRC1 SSRC0 — — ASAM SAMP DONE 0000
AD1CON2 0322 VCFG2 VCFG1 VCFG0 r — CSCNA — — BUFS SMPI4 SMPI3 SMPI2 SMPI1 SMPI0 BUFM ALTS 0000
AD1CON3 0324 ADRC r r SAMC4 SAMC3 SAMC2 SAMC1 SAMC0 ADCS7 ADCS6 ADCS5 ADCS4 ADCS3 ADCS2 ADCS1 ADCS0 0000
AD1CHS 0328 CH0NB —— CH0SB4 CH0SB3 CH0SB2 CH0SB1 CH0SB0 CH0NA —— CH0SA4 CH0SA3 CH0SA2 CH0SA1 CH0SA0 0000
AD1CSSH 032E ———— CSSL27 CSSL26 CSSL25 CSSL24 CSSL23(1) CSSL22(1) CSSL21(1) CSSL20(1) CSSL19(1) CSSL18(1) CSSL17(1) CSSL16(1) 0000
AD1CSSL 0330 CSSL15 CSSL14 CSSL13 CSSL12 CSSL11 CSSL10 CSSL9 CSSL8 CSSL7 CSSL6 CSSL5 CSSL4 CSSL3 CSSL2 CSSL1 CSSL0 0000
TABLE 4-21: ADC REGISTER MAP (CONTINUED)
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
Legend: — = unimplemented, read as ‘0’, r = Reserved, maintain as ‘0’. Reset values are shown in hexadecimal.
Note 1: Unimplemented in 64-pin devices, read as ‘0’
TABLE 4-22: CTMU REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
CTMUCON 033C CTMUEN — CTMUSIDL TGEN EDGEN EDGSEQEN IDISSEN CTTRIG EDG2POL EDG2SEL1 EDG2SEL0 EDG1POL EDG1SEL1 EDG1SEL0 EDG2STAT EDG1STAT 0000
CTMUICON 033E ITRIM5 ITRIM4 ITRIM3 ITRIM2 ITRIM1 ITRIM0 IRNG1 IRNG0 — — — — — — — — 0000
Legend:
— = unimplemented, read as ‘
0
’. Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 61
PIC24FJ256GB210 FAMILY
TABLE 4-23: USB OTG REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
U1OTGIR
(2)
0480
— — — — — — — — IDIF T1MSECIF LSTATEIF ACTVIF SESVDIF SESENDIF — VBUSVDIF
0000
U1OTGIE
(2)
0482
— — — — — — — — IDIE T1MSECIE LSTATEIE ACTVIE SESVDIE SESENDIE — VBUSVDIE
0000
U1OTGSTAT
2)
0484
— — — — — — — —ID —LSTATE— SESVD SESEND — VBUSVD
0000
U1OTGCON
(2)
0486
— — — — — — — — DPPULUP DMPULUP DPPULDWN DMPULDWN VBUSON OTGEN VBUSCHG VBUSDIS
0000
U1PWRC
0488
— — — — — — — —UACTPND ——USLPGRD—— USUSPND USBPWR
0000
U1IR
048A(1)
— — — — — — — —STALLIF — RESUMEIF IDLEIF TRNIF SOFIF UERRIF URSTIF
0000
— — — — — — — — STALLIF ATTACHIF
(1)
RESUMEIF IDLEIF TRNIF SOFIF UERRIF DETACHIF
(1)
0000
U1IE
048C(1)
— — — — — — — — STALLIE — RESUMEIE IDLEIE TRNIE SOFIE UERRIE URSTIE
0000
— — — — — — — — STALLIE ATTACHIE
(1)
RESUMEIE IDLEIE TRNIE SOFIE UERRIE DETACHIE
(1)
0000
U1EIR
048E(1)
— — — — — — — —BTSEF — DMAEF BTOEF DFN8EF CRC16EF CRC5EF PIDEF
0000
— — — — — — — —BTSEF — DMAEF BTOEF DFN8EF CRC16EF EOFEF
(1)
PIDEF
0000
U1EIE
0490(1)
— — — — — — — —BTSEE — DMAEE BTOEE DFN8EE CRC16EE CRC5EE PIDEE
0000
— — — — — — — —BTSEE — DMAEE BTOEE DFN8EE CRC16EE EOFEE
(1)
PIDEE
0000
U1STAT
0492
— — — — — — — — ENDPT3 ENDPT2 ENDPT1 ENDPT0 DIR PPBI — —
0000
U1CON
0494(1)
— — — — — — — — — SE0 PKTDIS — HOSTEN RESUME PPBRST USBEN
0000
— — — — — — — —JSTATE
(1)
SE0 TOKBUSY USBRST HOSTEN RESUME PPBRST SOFEN
(1)
0000
U1ADDR
0496
— — — — — — — —LSPDEN
(1)
USB Device Address (DEVADDR) Register
0000
U1BDTP1
0498
— — — — — — — — Buffer Descriptor Table Base Address Register —
0000
U1FRML
049A
— — — — — — — — Frame Count Register Low Byte
0000
U1FRMH
049C
— — — — — — — — — — — — — Frame Count Register High Byte
0000
U1TOK
(2)
049E
— — — — — — — — PID3 PID2 PID1 PID0 EP3 EP2 EP1 EP0
0000
U1SOF
(2)
04A0
— — — — — — — — Start-of-Frame Count Register
0000
U1CNFG1
04A6
— — — — — — — —UTEYEUOEMON — USBSIDL —— PPB1 PPB0
0000
U1CNFG2
04A8
— — — — — — — — — — UVCMPSEL PUVBUS EXTI2CEN UVBUSDIS UVCMPDIS UTRDIS
0000
U1EP0
04AA
— — — — — — — —LSPD
(1)
RETRYDIS
(1)
— EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP1
04AC
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP2
04AE
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP3
04B0
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP4
04B2
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP5
04B4
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP6
04B6
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP7
04B8
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP8
04BA
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
U1EP9
04BC
— — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
Note 1: Alternate register or bit definitions when the module is operating in Host mode.
2: This register is available in Host mode only.
PIC24FJ256GB210 FAMILY
DS39975A-page 62 2010 Microchip Technology Inc.
U1EP10 04BE — — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK 0000
U1EP11 04C0 — — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK 0000
U1EP12 04C2 — — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK 0000
U1EP13 04C4 — — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK 0000
U1EP14 04C6 — — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK 0000
U1EP15 04C8 — — — — — — — — — — — EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK 0000
U1PWMRRS 04CC USB Power Supply PWM Duty Cycle Register USB Power Supply PWM Period Register 0000
U1PWMCON 04CE PWMEN — — — — — PWMPOL CNTEN — — — — — — — — 0000
TABLE 4-23: USB OTG REGISTER MAP (CONTINUED)
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
Note 1: Alternate register or bit definitions when the module is operating in Host mode.
2: This register is available in Host mode only.
TABLE 4-24: ANCFG REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
ANCFG 04DE — — — — — — — — — — — — — VBG6EN VBG2EN VBGEN 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
TABLE 4-25: ANSEL REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets(2)
ANSA(1) 04E0 — — — — — ANSA10(1) ANSA9(1) — ANSA7(1) ANSA6(1) — — — — — — 06C0
ANSB 04E2 ANSB15 ANSB14 ANSB13 ANSB12 ANSB11 ANSB10 ANSB9 ANSB8 ANSB7 ANSB6 ANSB5 ANSB4 ANSB3 ANSB2 ANSB1 ANSB0 FFFF
ANSC 04E4 — ANSC14 ANSC13 — — — — — — — —ANSC4
(1) — — — — 6010
ANSD 04E6 — — — — — — — — ANSD7 ANSD6 — — — — — — 00C0
ANSE(1) 04E8 — — — — — —ANSE9
(1) — — — — — — — — — 0200
ANSF 04EA — — — — — — — — — — — — — — —ANSF00001
ANSG 04EC — — — — — — ANSG9 ANSG8 ANSG7 ANSG6 — — — — — — 03C0
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
Note 1: Unimplemented in 64-pin devices, read as ‘0’.
2: Reset values are valid for 100-pin devices only.
2010 Microchip Technology Inc. DS39975A-page 63
PIC24FJ256GB210 FAMILY
TABLE 4-26: ENHANCED PARALLEL MASTER/SLAVE PORT REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
PMCON1 0600 PMPEN — PSIDL ADRMUX1 ADRMUX0 — MODE1 MODE0 CSF1 CSF0 ALP ALMODE — BUSKEEP IRQM1 IRQM0 0000
PMCON2 0602 BUSY — ERROR TIMEOUT r r r r RADDR23 RADDR22 RADDR21 RADDR20 RADDR19 RADDR18 RADDR17 RADDR16 0000
PMCON3 0604 PTWREN PTRDEN PTBE1EN PTBE0EN — AWAITM1 AWAITM0 AWAITE —PTEN22
(1) PTEN21(1) PTEN20(1) PTEN19(1) PTEN18(1) PTEN17(1) PTEN16(1) 0000
PMCON4 0606 PTEN15 PTEN14 PTEN13 PTEN12 PTEN11 PTEN10 PTEN9 PTEN8 PTEN7 PTEN6 PTEN5 PTEN4 PTEN3 PTEN2 PTEN1 PTEN0 0000
PMCS1CF 0608 CSDIS CSP CSPTEN BEP — WRSP RDSP SM ACKP PTSZ1 PTSZ0 — — — — — 0000
PMCS1BS 060A BASE23 BASE22 BASE21 BASE20 BASE19 BASE18 BASE17 BASE16 BASE15 — — —BASE11— — — 0200
PMCS1MD 060C ACKM1 ACKM0 r r r — — — DWAITB1 DWAITB0 DWAITM3 DWAITM2 DWAITM1 DWAITM0 DWAITE1 DWAITE0 0000
PMCS2CF 060E CSDIS CSP CSPTEN BEP — WRSP RDSP SM ACKP PTSZ1 PTSZ0 — — — — — 0000
PMCS2BS 0610 BASE23 BASE22 BASE21 BASE20 BASE19 BASE18 BASE17 BASE16 BASE15 — — —BASE11— — — 0600
PMCS2MD 0612 ACKM1 ACKM0 r r r — — — DWAITB1 DWAITB0 DWAITM3 DWAITM2 DWAITM1 DWAITM0 DWAITE1 DWAITE0 0000
PMDOUT1 0614 EPMP Data Out Register 1<15:8> EPMP Data Out Register 1<7:0> xxxx
PMDOUT2 0616 EPMP Data Out Register 2<15:8> EPMP Data Out Register 2<7:0> xxxx
PMDIN1 0618 EPMP Data In Register 1<15:8> EPMP Data In Register 1<7:0> xxxx
PMDIN2 061A EPMP Data In Register 2<15:8> EPMP Data In Register 2<7:0> xxxx
PMSTAT 061C IBF IBOV —— IB3F IB2F IB1F IB0F OBE OBUF —— OB3E OB2E OB1E OB0E 008F
Legend: — = unimplemented, read as ‘0’, r = Reserved. Reset values are shown in hexadecimal.
Note 1: Unimplemented in 64-pin devices, read as ‘0’.
TABLE 4-27: REAL-TIME CLOCK AND CALENDAR REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
ALRMVAL 0620 Alarm Value Register Window Based on ALRMPTR<1:0> xxxx
ALCFGRPT 0622 ALRMEN CHIME AMASK3 AMASK2 AMASK1 AMASK0 ALRMPTR1 ALRMPTR0 ARPT7 ARPT6 ARPT5 ARPT4 ARPT3 ARPT2 ARPT1 ARPT0 0000
RTCVAL 0624 RTCC Value Register Window Based on RTCPTR<1:0> xxxx
RCFGCAL 0626 RTCEN — RTCWREN RTCSYNC HALFSEC RTCOE RTCPTR1 RTCPTR0 CAL7 CAL6 CAL5 CAL4 CAL3 CAL2 CAL1 CAL0 (Note 1)
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
Note 1: The status of the RCFGCAL register on POR is ‘0000’ and on other Resets is unchanged.
PIC24FJ256GB210 FAMILY
DS39975A-page 64 2010 Microchip Technology Inc.
TABLE 4-28: COMPARATORS REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
CMSTAT 0630 CMIDL — — — C3EVT C2EVT C1EVT — — — — — C3OUT C2OUT C1OUT 0000
CVRCON 0632 — — — — — CVREFP CVREFM1 CVREFM0 CVREN CVROE CVRR CVRSS CVR3 CVR2 CVR1 CVR0 0000
CM1CON 0634 CON COE CPOL ——— CEVT COUT EVPOL1 EVPOL0 — CREF — — CCH1 CCH0 0000
CM2CON 0636 CON COE CPOL ——— CEVT COUT EVPOL1 EVPOL0 — CREF — — CCH1 CCH0 0000
CM3CON 0638 CON COE CPOL ——— CEVT COUT EVPOL1 EVPOL0 — CREF — — CCH1 CCH0 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
TABLE 4-29: CRC REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
CRCCON1 0640 CRCEN — CSIDL VWORD4 VWORD3 VWORD2 VWORD1 VWORD0 CRCFUL CRCMPT CRCISEL CRCGO LENDIAN — — — 0040
CRCCON2 0642 — — — DWIDTH4 DWIDTH3 DWIDTH2 DWIDTH1 DWIDTH0 — — — PLEN4 PLEN3 PLEN2 PLEN1 PLEN0 0000
CRCXORL 0644 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 X1 —0000
CRCXORH 0646 X31 X30 X29 X28 X27 X26 X25 X24 X23 X22 X21 X20 X19 X18 X17 X16 0000
CRCDATL 0648 CRC Data Input Register Low 0000
CRCDATH 064A CRC Data Input Register High 0000
CRCWDATL 064C CRC Result Register Low 0000
CRCWDATH 064E CRC Result Register High 0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
2010 Microchip Technology Inc. DS39975A-page 65
PIC24FJ256GB210 FAMILY
TABLE 4-30: PERIPHERAL PIN SELECT REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
RPINR0 0680 —— INT1R5 INT1R4 INT1R3 INT1R2 INT1R1 INT1R0 — — — — — — — — 3F00
RPINR1 0682 —— INT3R5 INT3R4 INT3R3 INT3R2 INT3R1 INT3R0 —— INT2R5 INT2R4 INT2R3 INT2R2 INT2R1 INT2R0 3F3F
RPINR2 0684 — — — — — — — — — — INT4R5 INT4R4 INT4R3 INT4R2 INT4R1 INT4R0 003F
RPINR3 0686 —— T3CKR5 T3CKR4 T3CKR3 T3CKR2 T3CKR1 T3CKR0 —— T2CKR5T2CKR4T2CKR3T2CKR2T2CKR1T2CKR0 3F3F
RPINR4 0688 —— T5CKR5 T5CKR4 T5CKR3 T5CKR2 T5CKR1 T5CKR0 —— T4CKR5T4CKR4T4CKR3T4CKR2T4CKR1T4CKR0 3F3F
RPINR7 068E —— IC2R5 IC2R4 IC2R3 IC2R2 IC2R1 IC2R0 —— IC1R5 IC1R4 IC1R3 IC1R2 IC1R1 IC1R0 3F3F
RPINR8 0690 —— IC4R5 IC4R4 IC4R3 IC4R2 IC4R1 IC4R0 —— IC3R5 IC3R4 IC3R3 IC3R2 IC3R1 IC3R0 3F3F
RPINR9 0692 —— IC6R5 IC6R4 IC6R3 IC6R2 IC6R1 IC6R0 —— IC5R5 IC5R4 IC5R3 IC5R2 IC5R1 IC5R0 3F3F
RPINR10 0694 —— IC8R5 IC8R4 IC8R3 IC8R2 IC8R1 IC8R0 —— IC7R5 IC7R4 IC7R3 IC7R2 IC7R1 IC7R0 3F3F
RPINR11 0696 —— OCFBR5 OCFBR4 OCFBR3 OCFBR2 OCFBR1 OCFBR0 —— OCFAR5OCFAR4OCFAR3OCFAR2OCFAR1OCFAR0 3F3F
RPINR15 069E —— IC9R5 IC9R4 IC9R3 IC9R2 IC9R1 IC9R0 — — — — — — — — 3F00
RPINR17 06A2 —— U3RXR5 U3RXR4 U3RXR3 U3RXR2 U3RXR1 U3RXR0 — — — — — — — — 3F00
RPINR18 06A4 —— U1CTSR5 U1CTSR4 U1CTSR3 U1CTSR2 U1CTSR1 U1CTSR0 —— U1RXR5U1RXR4U1RXR3U1RXR2U1RXR1U1RXR0 3F3F
RPINR19 06A6 —— U2CTSR5 U2CTSR4 U2CTSR3 U2CTSR2 U2CTSR1 U2CTSR0 —— U2RXR5U2RXR4U2RXR3U2RXR2U2RXR1U2RXR0 3F3F
RPINR20 06A8 —— SCK1R5 SCK1R4 SCK1R3 SCK1R2 SCK1R1 SCK1R0 —— SDI1R5SDI1R4SDI1R3SDI1R2SDI1R1SDI1R0 3F3F
RPINR21 06AA —— U3CTSR5 U3CTSR4 U3CTSR3 U3CTSR2 U3CTSR1 U3CTSR0 —— SS1R5 SS1R4 SS1R3 SS1R2 SS1R1 SS1R0 3F3F
RPINR22 06AC —— SCK2R5 SCK2R4 SCK2R3 SCK2R2 SCK2R1 SCK2R0 —— SDI2R5SDI2R4SDI2R3SDI2R2SDI2R1SDI2R0 3F3F
RPINR23 06AE — — — — — — — — — — SS2R5 SS2R4 SS2R3 SS2R2 SS2R1 SS2R0 003F
RPINR27 06B6 —— U4CTSR5 U4CTSR4 U4CTSR3 U4CTSR2 U4CTSR1 U4CTSR0 —— U4RXR5U4RXR4U4RXR3U4RXR2U4RXR1U4RXR0 3F3F
RPINR28 06B8 —— SCK3R5 SCK3R4 SCK3R3 SCK3R2 SCK3R1 SCK3R0 —— SDI3R5SDI3R4SDI3R3SDI3R2SDI3R1SDI3R0 3F3F
RPINR29 06BA — — — — — — — — — — SS3R5 SS3R4 SS3R3 SS3R2 SS3R1 SS3R0 003F
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
Note 1: Bits are unimplemented in 64-pin devices; read as ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 66 2010 Microchip Technology Inc.
RPOR0 06C0 —— RP1R5 RP1R4 RP1R3 RP1R2 RP1R1 RP1R0 —— RP0R5 RP0R4 RP0R3 RP0R2 RP0R1 RP0R0 0000
RPOR1 06C2 —— RP3R5 RP3R4 RP3R3 RP3R2 RP3R1 RP3R0 —— RP2R5 RP2R4 RP2R3 RP2R2 RP2R1 RP2R0 0000
RPOR2 06C4 ——RP5R5
(1) RP5R4(1) RP5R3(1) RP5R2(1) RP5R1(1) RP5R0(1) —— RP4R5 RP4R4 RP4R3 RP4R2 RP4R1 RP4R0 0000
RPOR3 06C6 —— RP7R5 RP7R4 RP7R3 RP7R2 RP7R1 RP7R0 —— RP6R5 RP6R4 RP6R3 RP6R2 RP6R1 RP6R0 0000
RPOR4 06C8 —— RP9R5 RP9R4 RP9R3 RP9R2 RP9R1 RP9R0 —— RP8R5 RP8R4 RP8R3 RP8R2 RP8R1 RP8R0 0000
RPOR5 06CA —— RP11R5 RP11R4 RP11R3 RP11R2 RP11R1 RP11R0 —— RP10R5 RP10R4 RP10R3 RP10R2 RP10R1 RP10R0 0000
RPOR6 06CC —— RP13R5 RP13R4 RP13R3 RP13R2 RP13R1 RP13R0 —— RP12R5 RP12R4 RP12R3 RP12R2 RP12R1 RP12R0 0000
RPOR7 06CE —— RP15R5(1) RP15R4(1) RP15R3(1) RP15R2(1) RP15R1(1) RP15R0(1) —— RP14R5 RP14R4 RP14R3 RP14R2 RP14R1 RP14R0 0000
RPOR8 06D0 —— RP17R5 RP17R4 RP17R3 RP17R2 RP17R1 RP17R0 —— RP16R5 RP16R4 RP16R3 RP16R2 RP16R1 RP16R0 0000
RPOR9 06D2 —— RP19R5 RP19R4 RP19R3 RP19R2 RP19R1 RP19R0 —— RP18R5 RP18R4 RP18R3 RP18R2 RP18R1 RP18R0 0000
RPOR10 06D4 —— RP21R5 RP21R4 RP21R3 RP21R2 RP21R1 RP21R0 —— RP20R5 RP20R4 RP20R3 RP20R2 RP20R1 RP20R0 0000
RPOR11 06D6 —— RP23R5 RP23R4 RP23R3 RP23R2 RP23R1 RP23R0 —— RP22R5 RP22R4 RP22R3 RP22R2 RP22R1 RP22R0 0000
RPOR12 06D8 —— RP25R5 RP25R4 RP25R3 RP25R2 RP25R1 RP25R0 —— RP24R5 RP24R4 RP24R3 RP24R2 RP24R1 RP24R0 0000
RPOR13 06DA —— RP27R5 RP27R4 RP27R3 RP27R2 RP27R1 RP27R0 —— RP26R5 RP26R4 RP26R3 RP26R2 RP26R1 RP26R0 0000
RPOR14 06DC —— RP29R5 RP29R4 RP29R3 RP29R2 RP29R1 RP29R0 —— RP28R5 RP28R4 RP28R3 RP28R2 RP28R1 RP28R0 0000
RPOR15(1) 06DE —— RP31R5(1) RP31R4(1) RP31R3(1) RP31R2(1) RP31R1(1) RP31R0(1) —— RP30R5(1) RP30R4(1) RP30R3(1) RP30R2(1) RP30R1(1) RP30R0(1) 0000
TABLE 4-30: PERIPHERAL PIN SELECT REGISTER MAP (CONTINUED)
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
Note 1: Bits are unimplemented in 64-pin devices; read as ‘0’.
2010 Microchip Technology Inc. DS39975A-page 67
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TABLE 4-31: SYSTEM REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
RCON 0740 TRAPR IOPUWR ———— CM VREGS EXTR SWR SWDTEN WDTO SLEEP IDLE BOR POR
Note 1
OSCCON 0742 — COSC2 COSC1 COSC0 — NOSC2 NOSC1 NOSC0 CLKLOCK IOLOCK LOCK — CF POSCEN SOSCEN OSWEN
Note 2
CLKDIV 0744 ROI DOZE2 DOZE1 DOZE0 DOZEN RCDIV2 RCDIV1 RCDIV0 CPDIV1 CPDIV0 PLLEN
r
— — — —
0100
OSCTUN 0748 — — — — — — — — — — TUN5 TUN4 TUN3 TUN2 TUN1 TUN0
0000
REFOCON 074E ROEN — ROSSLP ROSEL RODIV3 RODIV2 RODIV1 RODIV0 — — — — — — — —
0000
Legend: — = unimplemented, read as ‘0’, r = Reserved. Reset values are shown in hexadecimal.
Note 1: The Reset value of the RCON register is dependent on the type of Reset event. See Section 6.0 “Resets” for more information.
2: The Reset value of the OSCCON register is dependent on both the type of Reset event and the device configuration. See Section 8.0 “Oscillator Configuration” for more information.
TABLE 4-32: NVM REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
NVMCON 0760 WR WREN WRERR — — — — — —ERASE—— NVMOP3 NVMOP2 NVMOP1 NVMOP0
0000
(1)
NVMKEY 0766 ———————— NVMKEY Register<7:0>
0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
Note 1: Reset value shown is for POR only. Value on other Reset states is dependent on the state of memory write or erase operations at the time of Reset.
TABLE 4-33: PMD REGISTER MAP
File
Name Addr Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All
Resets
PMD1 0770 T5MD T4MD T3MD T2MD T1MD — — — I2C1MD U2MD U1MD SPI2MD SPI1MD — — ADC1MD 0000
PMD2 0772 IC8MD IC7MD IC6MD IC5MD IC4MD IC3MD IC2MD IC1MD OC8MD OC7MD OC6MD OC5MD OC4MD OC3MD OC2MD OC1MD 0000
PMD3 0774 ————— CMPMD RTCCMD PMPMD CRCMD — — — U3MD I2C3MD I2C2MD —0000
PMD4 0776 ——————— — — UPWMMD U4MD — REFOMD CTMUMD LVDMD USB1MD 0000
PMD5 0778 ———————IC9MD— — — — — — —OC9MD0000
PMD6 077A ——————— — — — —————SPI3MD0000
Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal.
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DS39975A-page 68 2010 Microchip Technology Inc.
4.2.5 EXTENDED DATA SPACE (EDS)
The enhancement of the data space in
PIC24FJ256GB210 family devices has been
accomplished by a new technique, called the Extended
Data Space (EDS).
The EDS includes any additional internal extended
data memory not accessible by the lower 32 Kbytes of
data address space, any external memory through
EPMP and the Program Space Visibility (PSV).
The extended data space is always accessed through
the EDS window, which is the upper half of data space.
The entire extended data space is organized into EDS
pages, each having 32 Kbytes of data. Mapping of the
EDS page into the EDS window is done by using the
Data Space Read register (DSRPAG<9:0>) for read
operations and Data Space Write register
(DSWPAG<8:0>) for write operations. Figure 4-4
displays the entire EDS space.
FIGURE 4-4: EXTENDED DATA SPACE
Note: Accessing Page 0 in the EDS window will
generate an address error trap as Page 0
is the base data memory (data locations,
0x0800 to 0x7FFF, in the lower data
space).
0x0000
Extended SRAM (66 KB)
Special
Registers
30 KB Data
32 KB EDS
Window
Memory
0x8000
Program Memory
DSxPAG
= 0x001 DSxPAG
= 0x003
DSx PAG
= 0x1FF DSRPAG
= 0x200
DSRPAG
= 0x3FF
Function
0x008000
0x00FFFE
0x000000 0x7F8001
0xFFFFFE 0x007FFE 0x7FFFFF
Internal Program
Space
0x0800
0xFFFE
EDS Space
EPMP Memory Space
0x018000
0x0187FE
Extended
Memory
Internal
Extended
Memory
External
Memory
Access
using
EPMP
External
Memory
Access
using
EPMP
0xFF8000
DSRPAG
= 0x2FF
0x7F8000
0x7FFFFE
Access
Program
Space
Access
Program
Space
Access
DSRPAG
= 0x300
0x000001
0x007FFF
Program
Space
Access
0x01FFFE
0x018800
2010 Microchip Technology Inc. DS39975A-page 69
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4.2.5.1 Data Read from EDS Space
In order to read the data from the EDS space, first, an
Address Pointer is set up by loading the required EDS
page number into the DSRPAG register and assigning
the offset address to one of the W registers. Once the
above assignment is done, the EDS window is enabled
by setting bit 15 of the working register, assigned with
the offset address; then, the contents of the pointed
EDS location can be read.
Figure 4-5 illustrates how the EDS space address is
generated for read operations.
FIGURE 4-5: EDS ADDRESS GENERATION FOR READ OPERATIONS
When the Most Significant bit (MSb) of EA is ‘1’ and
DSRPAG<9> = 0, the lower 9 bits of DSRPAG are con-
catenated to the lower 15 bits of EA to form a 24-bit
EDS space address for read operations.
Example 4-1 shows how to read a byte, word and
double-word from EDS.
EXAMPLE 4-1: EDS READ CODE IN ASSEMBLY
DSRPAG Reg
Select Wn
98
15 Bits
9 Bits
24-Bit EA
Wn<0> is Byte Select
0 = Extended SRAM and EPMP
1
0
Note: All read operations from EDS space have
an overhead of one instruction cycle.
Therefore, a minimum of two instruction
cycles is required to complete an EDS
read. EDS reads under the REPEAT
instruction; the first two accesses take
three cycles and the subsequent
accesses take one cycle.
; Set the EDS page from where the data to be read
mov #0x0002 , w0
mov w0 , DSRPAG ;page 2 is selected for read
mov #0x0800 , w1 ;select the location (0x800) to be read
bset w1 , #15 ;set the MSB of the base address, enable EDS mode
;Read a byte from the selected location
mov.b [w1++] , w2 ;read Low byte
mov.b [w1++] , w3 ;read High byte
;Read a word from the selected location
mov [w1] , w2 ;
;Read Double - word from the selected location
mov.d [w1] , w2 ;two word read, stored in w2 and w3
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DS39975A-page 70 2010 Microchip Technology Inc.
4.2.5.2 Data Write into EDS Space
In order to write data to EDS space, such as in EDS
reads, an Address Pointer is set up by loading the
required EDS page number into the DSWPAG register
and assigning the offset address to one of the W regis-
ters. Once the above assignment is done, then the
EDS window is enabled by setting bit 15 of the working
register, assigned with the offset address, and the
accessed location can be written.
Figure 4-2 illustrates how the EDS space address is
generated for write operations.
FIGURE 4-6: EDS ADDRESS GENERATION FOR WRITE OPERATIONS
When the MSb of EA is ‘1’, the lower 9 bits of DSWPAG
are concatenated to the lower 15 bits of EA to form a
24-bit EDS address for write operations. Example 4-2
shows how to write a byte, word and double-word to
EDS.
EXAMPLE 4-2: EDS WRITE CODE IN ASSEMBLY
DSWPAG Reg
Select Wn
8
15 Bits9 Bits
24-Bit EA
Wn<0> is Byte Select
1
0
; Set the EDS page where the data to be written
mov #0x0002 , w0
mov w0 , DSWPAG ;page 2 is selected for write
mov #0x0800 , w1 ;select the location (0x800) to be written
bset w1 , #15 ;set the MSB of the base address, enable EDS mode
;Write a byte to the selected location
mov #0x00A5 , w2
mov #0x003C , w3
mov.b w2 , [w1++] ;write Low byte
mov.b w3 , [w1++] ;write High byte
;Write a word to the selected location
mov #0x1234 , w2 ;
mov w2 , [w1] ;
;Write a Double - word to the selected location
mov #0x1122 , w2
mov #0x4455 , w3
mov.d w2 , [w1] ;2 EDS writes
2010 Microchip Technology Inc. DS39975A-page 71
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The page registers (DSRPAG/DSWPAG) do not
update automatically while crossing a page boundary
when the rollover happens, from 0xFFFF to 0x8000.
While developing code in assembly, care must be taken
to update the page registers when an Address Pointer
crosses the page boundary. The ‘C’ compiler keeps
track of the addressing and increments or decrements
the page registers accordingly while accessing
contiguous data memory locations.
TABLE 4-34: EDS MEMORY ADDRESS WITH DIFFERENT PAGES AND ADDRESSES
Note 1: All write operations to EDS are executed
in a single cycle.
2: Use of a Read/Modify/Write operation on
any EDS location under a REPEAT
instruction is not supported. For example:
BCLR, BSW, BTG, RLC f, RLNC f,
RRC f, RRNC f, ADD f, SUB f,
SUBR f, AND f, IOR f, XOR f,
ASR f, ASL f.
3: Use the DSRPAG register while performing
a Read/Modify/Write operation.
DSRPAG
(Data Space Read Register)
DSWPAG
(Data Space Write
Register)
Source/Destination
Address while
Indirect Addressing
24-Bit EA
Pointing to
EDS
Comment
x(1) x(1) 0x0000 to 0x1FFF 0x000000 to
0x001FFF
Near data
space(2)
0x2000 to 0x7FFF 0x002000 to
0x007FFF
0x001 0x001
0x8000 to 0xFFFF
0x008000 to
0x00FFFE
32 Kbytes on
each page
0x002 0x002 0x010000 to
0x017FFE
0x003 0x003 0x018000 to
0x0187FE
Only 2 Kbytes
of extended
SRAM on this
page
0x004 0x004 0x018800 to
0x027FFE
EPMP
memory space
•
•
•
•
•
•
•
•
•
0x1FF 0x1FF 0xFF8000 to
0xFFFFFE
0x000 0x000 Invalid Address Address error
trap(3)
Note 1: If the source/destination address is below 0x8000, the DSRPAG and DSWPAG registers are not considered.
2: This data space can also be accessed by Direct Addressing.
3: When the source/destination address is above 0x8000 and DSRPAG/DSWPAG is ‘0’, an address error
trap will occur.
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DS39975A-page 72 2010 Microchip Technology Inc.
4.2.6 SOFTWARE STACK
Apart from its use as a working register, the W15
register in PIC24F devices is also used as a Software
Stack Pointer (SSP). The pointer always points to the
first available free word and grows from lower to higher
addresses. It pre-decrements for stack pops and
post-increments for stack pushes, as shown in
Figure 4-7. Note that for a PC push during any CALL
instruction, the MSB of the PC is zero-extended before
the push, ensuring that the MSB is always clear.
The Stack Pointer Limit Value register (SPLIM), associ-
ated with the Stack Pointer, sets an upper address
boundary for the stack. SPLIM is uninitialized at Reset.
As is the case for the Stack Pointer, SPLIM<0> is
forced to ‘0’ as all stack operations must be
word-aligned. Whenever an EA is generated using
W15 as a source or destination pointer, the resulting
address is compared with the value in SPLIM. If the
contents of the Stack Pointer (W15) and the SPLIM reg-
ister are equal, and a push operation is performed, a
stack error trap will not occur. The stack error trap will
occur on a subsequent push operation. Thus, for
example, if it is desirable to cause a stack error trap
when the stack grows beyond address 2000h in RAM,
initialize the SPLIM with the value, 1FFEh.
Similarly, a Stack Pointer underflow (stack error) trap is
generated when the Stack Pointer address is found to
be less than 0800h. This prevents the stack from
interfering with the SFR space.
A write to the SPLIM register should not be immediately
followed by an indirect read operation using W15.
FIGURE 4-7: CALL STACK FRAME
4.3 Interfacing Program and Data
Memory Spaces
The PIC24F architecture uses a 24-bit wide program
space and 16-bit wide data space. The architecture is
also a modified Harvard scheme, meaning that data
can also be present in the program space. To use this
data successfully, it must be accessed in a way that
preserves the alignment of information in both spaces.
Aside from normal execution, the PIC24F architecture
provides two methods by which program space can be
accessed during operation:
• Using table instructions to access individual bytes
or words anywhere in the program space
• Remapping a portion of the program space into
the data space (program space visibility)
Table instructions allow an application to read or write
to small areas of the program memory. This makes the
method ideal for accessing data tables that need to be
updated from time to time. It also allows access to all
bytes of the program word. The remapping method
allows an application to access a large block of data on
a read-only basis, which is ideal for look ups from a
large table of static data. It can only access the least
significant word of the program word.
4.3.1 ADDRESSING PROGRAM SPACE
Since the address ranges for the data and program
spaces are 16 and 24 bits, respectively, a method is
needed to create a 23-bit or 24-bit program address
from 16-bit data registers. The solution depends on the
interface method to be used.
For table operations, the 8-bit Table Memory Page
Address register (TBLPAG) is used to define a 32K word
region within the program space. This is concatenated
with a 16-bit EA to arrive at a full 24-bit program space
address. In this format, the MSBs of TBLPAG are used
to determine if the operation occurs in the user memory
(TBLPAG<7> = 0) or the configuration memory
(TBLPAG<7> = 1).
For remapping operations, the 10-bit Extended Data
Space Read register (DSRPAG) is used to define a
16K word page in the program space. When the Most
Significant bit (MSb) of the EA is ‘1’, and the MSb (bit 9)
of DSRPAG is ‘1’, the lower 8 bits of DSRPAG are con-
catenated with the lower 15 bits of the EA to form a
23-bit program space address. The DSRPAG<8> bit
decides whether the lower word (when bit is ‘0’) or the
higher word (when bit is ‘1’) of program memory is
mapped. Unlike table operations, this strictly limits
remapping operations to the user memory area.
Table 4-35 and Figure 4-8 show how the program EA is
created for table operations and remapping accesses
from the data EA. Here, P<23:0> refers to a program
space word, whereas D<15:0> refers to a data space
word.
Note: A PC push during exception processing
will concatenate the SRL register to the
MSB of the PC prior to the push.
<Free Word>
PC<15:0>
000000000
015
W15 (before CALL)
W15 (after CALL)
Stack Grows Towards
Higher Address
0000h
PC<22:16>
POP : [--W15]
PUSH : [W15++]
2010 Microchip Technology Inc. DS39975A-page 73
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TABLE 4-35: PROGRAM SPACE ADDRESS CONSTRUCTION
FIGURE 4-8: DATA ACCESS FROM PROGRAM SPACE ADDRESS GENERATION
Access Type Access
Space
Program Space Address
<23> <22:16> <15> <14:1> <0>
Instruction Access
(Code Execution)
User 0PC<22:1> 0
0xx xxxx xxxx xxxx xxxx xxx0
TBLRD/TBLWT
(Byte/Word Read/Write)
User TBLPAG<7:0> Data EA<15:0>
0xxx xxxx xxxx xxxx xxxx xxxx
Configuration TBLPAG<7:0> Data EA<15:0>
1xxx xxxx xxxx xxxx xxxx xxxx
Program Space Visibility
(Block Remap/Read)
User 0DSRPAG<7:0>(2) Data EA<14:0>(1)
0 xxxx xxxx xxx xxxx xxxx xxxx
Note 1: Data EA<15> is always ‘1’ in this case, but is not used in calculating the program space address. Bit 15 of
the address is DSRPAG<0>.
2: DSRPAG<9> is always ‘1’ in this case. DSRPAG<8> decides whether the lower word or higher word of
program memory is read. When DSRPAG<8> is ‘0’, the lower word is read and when it is ‘1’, the higher
word is read.
0Program Counter
23 Bits
1
DSRPAG<7:0>
8 Bits
EA
15 Bits
Program Counter
Select
TBLPAG
8 Bits
EA
16 Bits
Byte Select
0
0
1/0
User/Configuration
Table Operations(2)
Program Space Visibility(1)
Space Select
24 Bits
23 Bits
(Remapping)
1/0
1/0
Note 1: DSRPAG<8> acts as word select. DSRPAG<9> should always be ‘1’ to map program memory to data memory.
2: The instructions, TBLRDH/TBLWTH/TBLRDL/TBLWTL, decide if the higher or lower word of program memory is
accessed. TBLRDH/TBLWTH instructions access the higher word and TBLRDL/TBLWTL instructions access the
lower word. Table read operations are permitted in the configuration memory space.
1-Bit
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4.3.2 DATA ACCESS FROM PROGRAM
MEMORY USING TABLE
INSTRUCTIONS
The TBLRDL and TBLWTL instructions offer a direct
method of reading or writing the lower word of any
address within the program space without going through
data space. The TBLRDH and TBLWTH instructions are
the only method to read or write the upper 8 bits of a
program space word as data.
The PC is incremented by two for each successive
24-bit program word. This allows program memory
addresses to directly map to data space addresses.
Program memory can thus be regarded as two, 16-bit
word-wide address spaces, residing side by side, each
with the same address range. TBLRDL and TBLWTL
access the space which contains the least significant
data word, and TBLRDH and TBLWTH access the space
which contains the upper data byte.
Two table instructions are provided to move byte or
word-sized (16-bit) data to and from program space.
Both function as either byte or word operations.
1. TBLRDL (Table Read Low): In Word mode, it
maps the lower word of the program space
location (P<15:0>) to a data address (D<15:0>).
In Byte mode, either the upper or lower byte of
the lower program word is mapped to the lower
byte of a data address. The upper byte is
selected when byte select is ‘1’; the lower byte
is selected when it is ‘0’.
2. TBLRDH (Table Read High): In Word mode, it
maps the entire upper word of a program address
(P<23:16>) to a data address. Note that
D<15:8>, the ‘phantom’ byte, will always be ‘0’.
In Byte mode, it maps the upper or lower byte of
the program word to D<7:0> of the data
address, as above. Note that the data will
always be ‘0’ when the upper ‘phantom’ byte is
selected (byte select = 1).
In a similar fashion, two table instructions, TBLWTH
and TBLWTL, are used to write individual bytes or
words to a program space address. The details of
their operation are described in Section 5.0 “Flash
Program Memory”.
For all table operations, the area of program memory
space to be accessed is determined by the Table
Memory Page Address register (TBLPAG). TBLPAG
covers the entire program memory space of the
device, including user and configuration spaces. When
TBLPAG<7> = 0, the table page is located in the user
memory space. When TBLPAG<7> = 1, the page is
located in configuration space.
FIGURE 4-9: ACCESSING PROGRAM MEMORY WITH TABLE INSTRUCTIONS
Note: Only table read operations will execute in
the configuration memory space, where
Device IDs are located. Table write
operations are not allowed.
081623
00000000
00000000
00000000
00000000
‘Phantom’ Byte
TBLRDH.B (Wn<0> = 0)
TBLRDL.W
TBLRDL.B (Wn<0> = 1)
TBLRDL.B (Wn<0> = 0)
23 15 0
TBLPAG
02
000000h
800000h
020000h
030000h
Program Space
Data EA<15:0>
The address for the table operation is determined by the data EA
within the page defined by the TBLPAG register.
Only read operations are shown; write operations are also valid in
the user memory area.
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4.3.3 READING DATA FROM PROGRAM
MEMORY USING EDS
The upper 32 Kbytes of data space may optionally be
mapped into any 16K word page of the program space.
This provides transparent access of stored constant
data from the data space without the need to use
special instructions (i.e., TBLRDL/H).
Program space access through the data space occurs
when the MSb of EA is ‘1’ and the DSRPAG<9> is also
‘1’. The lower 8 bits of DSRPAG are concatenated to the
Wn<14:0> bits to form a 23-bit EA to access program
memory. The DSRPAG<8> decides which word should
be addressed; when the bit is ‘0’, the lower word and
when ‘1’, the upper word of the program memory is
accessed.
The entire program memory is divided into 512 EDS
pages, from 0x200 to 0x3FF, each consisting of 16K
words of data. Pages, 0x200 to 0x2FF, correspond to
the lower words of the program memory, while 0x300 to
0x3FF correspond to the upper words of the program
memory.
Using this EDS technique, the entire program memory
can be accessed. Previously, the access to the upper
word of the program memory was not supported.
Table 4-36 provides the corresponding 23-bit EDS
address for program memory with EDS page and
source addresses.
For operations that use PSV and are executed outside
a REPEAT loop, the MOV and MOV.D instructions will
require one instruction cycle in addition to the specified
execution time. All other instructions will require two
instruction cycles in addition to the specified execution
time.
For operations that use PSV, which are executed inside
a REPEAT loop, there will be some instances that
require two instruction cycles in addition to the
specified execution time of the instruction:
• Execution in the first iteration
• Execution in the last iteration
• Execution prior to exiting the loop due to an
interrupt
• Execution upon re-entering the loop after an
interrupt is serviced
Any other iteration of the REPEAT loop will allow the
instruction accessing data, using PSV, to execute in a
single cycle.
TABLE 4-36: EDS PROGRAM ADDRESS WITH DIFFERENT PAGES AND ADDRESSES
DSRPAG
(Data Space Read Register)
Source Address
while Indirect
Addressing
23-Bit EA Pointing to EDS Comment
0x200
0x8000 to 0xFFFF
0x000000 to 0x007FFE
Lower words of 4M
program instructions
(8 Mbytes) for read
operations only.
•
•
•
•
•
•
0x2FF 0x7F8000 to 0x7FFFFE
0x300 0x000001 to 0x007FFF Upper words of 4M
program instructions
(4 Mbytes remaining,
4 Mbytes are phantom
bytes) for read
operations only.
•
•
•
•
•
•
0x3FF 0x7F8001 to 0x7FFFFF
0x000 Invalid Address Address error trap(1)
Note 1: When the source/destination address is above 0x8000 and DSRPAG/DSWPAG is ‘0’, an address error
trap will occur.
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FIGURE 4-10: PROGRAM SPACE VISIBILITY OPERATION TO ACCESS LOWER WORD
FIGURE 4-11: PROGRAM SPACE VISIBILITY OPERATION TO ACCESS HIGHER WORD
23 15 0
DSRPAG
Data Space
Program Space
0000h
8000h
FFFFh
202h 000000h
7FFFFEh
010000h
017FFEh
When DSRPAG<9:8> = 10 and EA<15> = 1
EDS Window
The data in the page
designated by DSRPAG
is mapped into the
upper half of the data
memory space....
Data EA<14:0>
...while the lower
15 bits of the EA
specify an exact
address within the
EDS area. This corre-
sponds exactly to the
same lower 15 bits of
the actual program
space address.
23 15 0
DSRPAG
Data Space
Program Space
0000h
8000h
FFFFh
302h 000000h
7FFFFEh
010001h
017FFFh
When DSRPAG<9:8> = 11 and EA<15> = 1
The data in the page
designated by DSRPAG
is mapped into the
upper half of the data
memory space....
Data EA<14:0>
...while the lower
15 bits of the EA
specify an exact
address within the
EDS area. This corre-
sponds exactly to the
same lower 15 bits of
the actual program
space address.
EDS Window
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EXAMPLE 4-3: EDS READ CODE FROM PROGRAM MEMORY IN ASSEMBLY
; Set the EDS page from where the data to be read
mov #0x0202 , w0
mov w0 , DSRPAG ;page 0x202, consisting lower words, is selected for read
mov #0x000A , w1 ;select the location (0x0A) to be read
bset w1 , #15 ;set the MSB of the base address, enable EDS mode
;Read a byte from the selected location
mov.b [w1++] , w2 ;read Low byte
mov.b [w1++] , w3 ;read High byte
;Read a word from the selected location
mov [w1] , w2 ;
;Read Double - word from the selected location
mov.d [w1] , w2 ;two word read, stored in w2 and w3
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NOTES:
2010 Microchip Technology Inc. DS39975A-page 79
PIC24FJ256GB210 FAMILY
5.0 FLASH PROGRAM MEMORY
The PIC24FJ256GB210 family of devices contains
internal Flash program memory for storing and execut-
ing application code. The program memory is readable,
writable and erasable. The Flash can be programmed
in four ways:
• In-Circuit Serial Programming™ (ICSP™)
• Run-Time Self-Programming (RTSP)
•JTAG
• Enhanced In-Circuit Serial Programming
(Enhanced ICSP)
ICSP allows a PIC24FJ256GB210 family device to be
serially programmed while in the end application circuit.
This is simply done with two lines for the programming
clock and programming data (named PGECx and
PGEDx, respectively), and three other lines for power
(VDD), ground (VSS) and Master Clear (MCLR). This
allows customers to manufacture boards with
unprogrammed devices and then program the
microcontroller just before shipping the product. This
also allows the most recent firmware or a custom
firmware to be programmed.
RTSP is accomplished using TBLRD (table read) and
TBLWT (table write) instructions. With RTSP, the user
may write program memory data in blocks of 64 instruc-
tions (192 bytes) at a time and erase program memory
in blocks of 512 instructions (1536 bytes) at a time.
5.1 Table Instructions and Flash
Programming
Regardless of the method used, all programming of
Flash memory is done with the table read and write
instructions. These allow direct read and write access to
the program memory space from the data memory while
the device is in normal operating mode. The 24-bit target
address in the program memory is formed using the
TBLPAG<7:0> bits and the Effective Address (EA) from
a W register, specified in the table instruction, as shown
in Figure 5-1.
The TBLRDL and the TBLWTL instructions are used to
read or write to bits<15:0> of program memory.
TBLRDL and TBLWTL can access program memory in
both Word and Byte modes.
The TBLRDH and TBLWTH instructions are used to read
or write to bits<23:16> of program memory. TBLRDH
and TBLWTH can also access program memory in Word
or Byte mode.
FIGURE 5-1: ADDRESSING FOR TABLE REGISTERS
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 4. “Program Memory”
(DS39715). The information in this data
sheet supersedes the information in the
FRM.
0
Program Counter
24 Bits
Program
TBLPAG Reg
8 Bits
Working Reg EA
16 Bits
Using
Byte
24-Bit EA
0
1
/
0
Select
Table
Instruction
Counter
Using
User/Configuration
Space Select
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DS39975A-page 80 2010 Microchip Technology Inc.
5.2 RTSP Operation
The PIC24F Flash program memory array is organized
into rows of 64 instructions or 192 bytes. RTSP allows
the user to erase blocks of eight rows (512 instructions)
at a time and to program one row at a time. It is also
possible to program single words.
The 8-row erase blocks and single row write blocks are
edge-aligned, from the beginning of program memory, on
boundaries of 1536 bytes and 192 bytes, respectively.
When data is written to program memory using TBLWT
instructions, the data is not written directly to memory.
Instead, data written using table writes is stored in
holding latches until the programming sequence is
executed.
Any number of TBLWT instructions can be executed
and a write will be successfully performed. However,
64 TBLWT instructions are required to write the full row
of memory.
To ensure that no data is corrupted during a write, any
unused address should be programmed with
FFFFFFh. This is because the holding latches reset to
an unknown state, so if the addresses are left in the
Reset state, they may overwrite the locations on rows
which were not rewritten.
The basic sequence for RTSP programming is to set up
a Table Pointer, then do a series of TBLWT instructions
to load the buffers. Programming is performed by
setting the control bits in the NVMCON register.
Data can be loaded in any order and the holding regis-
ters can be written to multiple times before performing
a write operation. Subsequent writes, however, will
wipe out any previous writes.
All of the table write operations are single-word writes
(2 instruction cycles), because only the buffers are writ-
ten. A programming cycle is required for programming
each row.
5.3 JTAG Operation
The PIC24F family supports JTAG boundary scan.
Boundary scan can improve the manufacturing
process by verifying pin to PCB connectivity.
5.4 Enhanced In-Circuit Serial
Programming
Enhanced In-Circuit Serial Programming uses an
on-board bootloader, known as the program executive,
to manage the programming process. Using an SPI
data frame format, the program executive can erase,
program and verify program memory. For more
information on Enhanced ICSP, see the device
programming specification.
5.5 Control Registers
There are two SFRs used to read and write the
program Flash memory: NVMCON and NVMKEY.
The NVMCON register (Register 5-1) controls which
blocks are to be erased, which memory type is to be
programmed and when the programming cycle starts.
NVMKEY is a write-only register that is used for write
protection. To start a programming or erase sequence,
the user must consecutively write 55h and AAh to the
NVMKEY register. Refer to Section 5.6 “Programming
Operations” for further details.
5.6 Programming Operations
A complete programming sequence is necessary for
programming or erasing the internal Flash in RTSP
mode. During a programming or erase operation, the
processor stalls (waits) until the operation is finished.
Setting the WR bit (NVMCON<15>) starts the opera-
tion and the WR bit is automatically cleared when the
operation is finished.
Note: Writing to a location multiple times without
erasing is not recommended.
2010 Microchip Technology Inc. DS39975A-page 81
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REGISTER 5-1: NVMCON: FLASH MEMORY CONTROL REGISTER
R/S-0, HC(1) R/W-0(1) R-0, HSC(1) U-0 U-0 U-0 U-0 U-0
WR WREN WRERR —————
bit 15 bit 8
U-0 R/W-0(1) U-0 U-0 R/W-0(1) R/W-0(1) R/W-0(1) R/W-0(1)
—ERASE——NVMOP3
(2) NVMOP2(2) NVMOP1(2) NVMOP0(2)
bit 7 bit 0
Legend: S = Settable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
HC = Hardware Clearable bit
bit 15 WR: Write Control bit(1)
1 = Initiates a Flash memory program or erase operation; the operation is self-timed and the bit is
cleared by hardware once the operation is complete
0 = Program or erase operation is complete and inactive
bit 14 WREN: Write Enable bit(1)
1 = Enables Flash program/erase operations
0 = Inhibits Flash program/erase operations
bit 13 WRERR: Write Sequence Error Flag bit(1)
1 = An improper program or erase sequence attempt, or termination has occurred (bit is set
automatically on any set attempt of the WR bit)
0 = The program or erase operation completed normally
bit 12-7 Unimplemented: Read as ‘0’
bit 6 ERASE: Erase/Program Enable bit(1)
1 = Performs the erase operation specified by NVMOP<3:0> on the next WR command
0 = Performs the program operation specified by NVMOP<3:0> on the next WR command
bit 5-4 Unimplemented: Read as ‘0’
bit 3-0 NVMOP<3:0>: NVM Operation Select bits(1,2)
1111 = Memory bulk erase operation (ERASE = 1) or no operation (ERASE = 0)(3)
0011 = Memory word program operation (ERASE = 0) or no operation (ERASE = 1)
0010 = Memory page erase operation (ERASE = 1) or no operation (ERASE = 0)
0001 = Memory row program operation (ERASE = 0) or no operation (ERASE = 1)
Note 1: These bits can only be reset on POR.
2: All other combinations of NVMOP<3:0> are unimplemented.
3: Available in ICSP™ mode only; refer to the device programming specification.
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DS39975A-page 82 2010 Microchip Technology Inc.
5.6.1 PROGRAMMING ALGORITHM FOR
FLASH PROGRAM MEMORY
The user can program one row of Flash program memory
at a time. To do this, it is necessary to erase the 8-row
erase block containing the desired row. The general
process is:
1. Read eight rows of program memory
(512 instructions) and store in data RAM.
2. Update the program data in RAM with the
desired new data.
3. Erase the block (see Example 5-1):
a) Set the NVMOP bits (NVMCON<3:0>) to
‘0010’ to configure for block erase. Set the
ERASE (NVMCON<6>) and WREN
(NVMCON<14>) bits.
b) Write the starting address of the block to be
erased into the TBLPAG and W registers.
c) Write 55h to NVMKEY.
d) Write AAh to NVMKEY.
e) Set the WR bit (NVMCON<15>). The erase
cycle begins and the CPU stalls for the dura-
tion of the erase cycle. When the erase is
done, the WR bit is cleared automatically.
4. Write the first 64 instructions from data RAM into
the program memory buffers (see Example 5-3).
5. Write the program block to Flash memory:
a) Set the NVMOP bits to ‘0001’ to configure
for row programming. Clear the ERASE bit
and set the WREN bit.
b) Write 55h to NVMKEY.
c) Write AAh to NVMKEY.
d) Set the WR bit. The programming cycle
begins and the CPU stalls for the duration
of the write cycle. When the write to Flash
memory is done, the WR bit is cleared
automatically.
6. Repeat steps 4 and 5, using the next available
64 instructions from the block in data RAM by
incrementing the value in TBLPAG, until all
512 instructions are written back to Flash
memory.
For protection against accidental operations, the write
initiate sequence for NVMKEY must be used to allow
any erase or program operation to proceed. After the
programming command has been executed, the user
must wait for the programming time until programming
is complete. The two instructions following the start of
the programming sequence should be NOPs, as shown
in Example 5-4.
EXAMPLE 5-1: ERASING A PROGRAM MEMORY BLOCK (ASSEMBLY LANGUAGE CODE)
; Set up NVMCON for block erase operation
MOV #0x4042, W0 ;
MOV W0, NVMCON ; Initialize NVMCON
; Init pointer to row to be ERASED
MOV #tblpage(PROG_ADDR), W0 ;
MOV W0, TBLPAG ; Initialize Program Memory (PM) Page Boundary SFR
MOV #tbloffset(PROG_ADDR), W0 ; Initialize in-page EA<15:0> pointer
TBLWTL W0, [W0] ; Set base address of erase block
DISI #5 ; Block all interrupts with priority <7
; for next 5 instructions
MOV.B #0x55, W0
MOV W0, NVMKEY ; Write the 0x55 key
MOV.B #0xAA, W1 ;
MOV W1, NVMKEY ; Write the 0xAA key
BSET NVMCON, #WR ; Start the erase sequence
NOP ; Insert two NOPs after the erase
NOP ; command is asserted
2010 Microchip Technology Inc. DS39975A-page 83
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EXAMPLE 5-2: ERASING A PROGRAM MEMORY BLOCK (‘C’ LANGUAGE CODE)
EXAMPLE 5-3: LOADING THE WRITE BUFFERS
EXAMPLE 5-4: INITIATING A PROGRAMMING SEQUENCE
// C example using MPLAB C30
unsigned long progAddr = 0xXXXXXX; // Address of row to write
unsigned int offset;
//Set up pointer to the first memory location to be written
TBLPAG = progAddr>>16; // Initialize PM Page Boundary SFR
offset = progAddr & 0xFFFF; // Initialize lower word of address
__builtin_tblwtl(offset, 0x0000); // Set base address of erase block
// with dummy latch write
NVMCON = 0x4042; // Initialize NVMCON
asm("DISI #5"); // Block all interrupts with priority <7
// for next 5 instructions
__builtin_write_NVM(); // check function to perform unlock
// sequence and set WR
; Set up NVMCON for row programming operations
MOV #0x4001, W0 ;
MOV W0, NVMCON ; Initialize NVMCON
; Set up a pointer to the first program memory location to be written
; program memory selected, and writes enabled
MOV #0x0000, W0 ;
MOV W0, TBLPAG ; Initialize PM Page Boundary SFR
MOV #0x6000, W0 ; An example program memory address
; Perform the TBLWT instructions to write the latches
; 0th_program_word
MOV #LOW_WORD_0, W2 ;
MOV #HIGH_BYTE_0, W3 ;
TBLWTL W2, [W0] ; Write PM low word into program latch
TBLWTH W3, [W0++] ; Write PM high byte into program latch
; 1st_program_word
MOV #LOW_WORD_1, W2 ;
MOV #HIGH_BYTE_1, W3 ;
TBLWTL W2, [W0] ; Write PM low word into program latch
TBLWTH W3, [W0++] ; Write PM high byte into program latch
; 2nd_program_word
MOV #LOW_WORD_2, W2 ;
MOV #HIGH_BYTE_2, W3 ;
TBLWTL W2, [W0] ; Write PM low word into program latch
TBLWTH W3, [W0++] ; Write PM high byte into program latch
•
•
•
; 63rd_program_word
MOV #LOW_WORD_63, W2 ;
MOV #HIGH_BYTE_63, W3 ;
TBLWTL W2, [W0] ; Write PM low word into program latch
TBLWTH W3, [W0] ; Write PM high byte into program latch
DISI #5 ; Block all interrupts with priority <7
; for next 5 instructions
MOV.B #0x55, W0
MOV W0, NVMKEY ; Write the 0x55 key
MOV.B #0xAA, W1 ;
MOV W1, NVMKEY ; Write the 0xAA key
BSET NVMCON, #WR ; Start the programming sequence
NOP ; Required delays
NOP
BTSC NVMCON, #15 ; and wait for it to be
BRA $-2 ; completed
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DS39975A-page 84 2010 Microchip Technology Inc.
5.6.2 PROGRAMMING A SINGLE WORD
OF FLASH PROGRAM MEMORY
If a Flash location has been erased, it can be pro-
grammed using table write instructions to write an
instruction word (24-bit) into the write latch. The
TBLPAG register is loaded with the 8 Most Significant
Bytes (MSB) of the Flash address. The TBLWTL and
TBLWTH instructions write the desired data into the
write latches and specify the lower 16 bits of the pro-
gram memory address to write to. To configure the
NVMCON register for a word write, set the NVMOP bits
(NVMCON<3:0>) to ‘0011’. The write is performed by
executing the unlock sequence and setting the WR bit
(see Example 5-5). An equivalent procedure in ‘C’
compiler, using the MPLAB C30 compiler and built-in
hardware functions, is shown in Example 5-6.
EXAMPLE 5-5: PROGRAMMING A SINGLE WORD OF FLASH PROGRAM MEMORY
EXAMPLE 5-6: PROGRAMMING A SINGLE WORD OF FLASH PROGRAM MEMORY
(‘C’ LANGUAGE CODE)
; Setup a pointer to data Program Memory
MOV #tblpage(PROG_ADDR), W0 ;
MOV W0, TBLPAG ;Initialize PM Page Boundary SFR
MOV #tbloffset(PROG_ADDR), W0 ;Initialize a register with program memory address
MOV #LOW_WORD_N, W2 ;
MOV #HIGH_BYTE_N, W3 ;
TBLWTL W2, [W0] ; Write PM low word into program latch
TBLWTH W3, [W0++] ; Write PM high byte into program latch
; Setup NVMCON for programming one word to data Program Memory
MOV #0x4003, W0 ;
MOV W0, NVMCON ; Set NVMOP bits to 0011
DISI #5 ; Disable interrupts while the KEY sequence is written
MOV.B #0x55, W0 ; Write the key sequence
MOV W0, NVMKEY
MOV.B #0xAA, W0
MOV W0, NVMKEY
BSET NVMCON, #WR ; Start the write cycle
NOP ; Required delays
NOP
// C example using MPLAB C30
unsigned int offset;
unsigned long progAddr = 0xXXXXXX; // Address of word to program
unsigned int progDataL = 0xXXXX; // Data to program lower word
unsigned char progDataH = 0xXX; // Data to program upper byte
//Set up NVMCON for word programming
NVMCON = 0x4003; // Initialize NVMCON
//Set up pointer to the first memory location to be written
TBLPAG = progAddr>>16; // Initialize PM Page Boundary SFR
offset = progAddr & 0xFFFF; // Initialize lower word of address
//Perform TBLWT instructions to write latches
__builtin_tblwtl(offset, progDataL); // Write to address low word
__builtin_tblwth(offset, progDataH); // Write to upper byte
asm(“DISI #5”); // Block interrupts with priority <7
// for next 5 instructions
__builtin_write_NVM(); // C30 function to perform unlock
// sequence and set WR
2010 Microchip Technology Inc. DS39975A-page 85
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6.0 RESETS
The Reset module combines all Reset sources and
controls the device Master Reset Signal, SYSRST. The
following is a list of device Reset sources:
• POR: Power-on Reset
•MCLR
: Pin Reset
•SWR: RESET Instruction
• WDT: Watchdog Timer Reset
• BOR: Brown-out Reset
• CM: Configuration Mismatch Reset
• TRAPR: Trap Conflict Reset
• IOPUWR: Illegal Opcode Reset
• UWR: Uninitialized W Register Reset
A simplified block diagram of the Reset module is
shown in Figure 6-1.
Any active source of Reset will make the SYSRST
signal active. Many registers associated with the CPU
and peripherals are forced to a known Reset state.
Most registers are unaffected by a Reset; their status is
unknown on POR and unchanged by all other Resets.
All types of device Reset will set a corresponding status
bit in the RCON register to indicate the type of Reset
(see Register 6-1). A POR will clear all bits, except for
the BOR and POR (RCON<1:0>) bits, which are set.
The user may set or clear any bit at any time during
code execution. The RCON bits only serve as status
bits. Setting a particular Reset status bit in software will
not cause a device Reset to occur.
The RCON register also has other bits associated with
the Watchdog Timer and device power-saving states.
The function of these bits is discussed in other sections
of this data sheet.
FIGURE 6-1: RESET SYSTEM BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 7. “Reset” (DS39712). The infor-
mation in this data sheet supersedes the
information in the FRM.
Note: Refer to the specific peripheral or CPU
section of this manual for register Reset
states.
Note: The status bits in the RCON register
should be cleared after they are read so
that the next RCON register value after a
device Reset will be meaningful.
MCLR
VDD
VDD Rise
Detect
POR
Sleep or Idle
Brown-out
Reset
Enable Voltage Regulator
RESET
Instruction
WDT
Module
Glitch Filter
BOR
Trap Conflict
Illegal Opcode
Uninitialized W Register
SYSRST
Configuration Mismatch
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DS39975A-page 86 2010 Microchip Technology Inc.
REGISTER 6-1: RCON: RESET CONTROL REGISTER(1)
R/W-0, HS R/W-0, HS U-0 U-0 U-0 U-0 R/W-0, HS R/W-0
TRAPR IOPUWR — — — —CMVREGS
(3)
bit 15 bit 8
R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-1, HS R/W-1, HS
EXTR SWR SWDTEN(2) WDTO SLEEP IDLE BOR POR
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 TRAPR: Trap Reset Flag bit
1 = A Trap Conflict Reset has occurred
0 = A Trap Conflict Reset has not occurred
bit 14 IOPUWR: Illegal Opcode or Uninitialized W Access Reset Flag bit
1 = An illegal opcode detection, an illegal address mode or uninitialized W register is used as an
Address Pointer and caused a Reset
0 = An illegal opcode or uninitialized W Reset has not occurred
bit 13-10 Unimplemented: Read as ‘0’
bit 9 CM: Configuration Word Mismatch Reset Flag bit
1 = A Configuration Word Mismatch Reset has occurred
0 = A Configuration Word Mismatch Reset has not occurred
bit 8 VREGS: Voltage Regulator Standby Enable bit(3)
1 = Program memory and regulator remain active during Sleep/Idle
0 = Program memory power is removed and regulator goes to standby during Seep/Idle
bit 7 EXTR: External Reset (MCLR) Pin bit
1 = A Master Clear (pin) Reset has occurred
0 = A Master Clear (pin) Reset has not occurred
bit 6 SWR: Software Reset (Instruction) Flag bit
1 =A RESET instruction has been executed
0 =A RESET instruction has not been executed
bit 5 SWDTEN: Software Enable/Disable of WDT bit(2)
1 = WDT is enabled
0 = WDT is disabled
bit 4 WDTO: Watchdog Timer Time-out Flag bit
1 = WDT time-out has occurred
0 = WDT time-out has not occurred
bit 3 SLEEP: Wake From Sleep Flag bit
1 = Device has been in Sleep mode
0 = Device has not been in Sleep mode
Note 1: All of the Reset status bits may be set or cleared in software. Setting one of these bits in software does not
cause a device Reset.
2: If the FWDTEN Configuration bit is ‘1’ (unprogrammed), the WDT is always enabled, regardless of the
SWDTEN bit setting.
3: Re-enabling the regulator after it enters Standby mode will add a delay, TVREG, when waking up from
Sleep. Applications that do not use the voltage regulator should set this bit to prevent this delay from
occurring.
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TABLE 6-1: RESET FLAG BIT OPERATION
bit 2 IDLE: Wake-up From Idle Flag bit
1 = Device has been in Idle mode
0 = Device has not been in Idle mode
bit 1 BOR: Brown-out Reset Flag bit
1 = A Brown-out Reset has occurred
Note that BOR is also set after a Power-on Reset.
0 = A Brown-out Reset has not occurred
bit 0 POR: Power-on Reset Flag bit
1 = A Power-on Reset has occurred
0 = A Power-on Reset has not occurred
REGISTER 6-1: RCON: RESET CONTROL REGISTER(1) (CONTINUED)
Note 1: All of the Reset status bits may be set or cleared in software. Setting one of these bits in software does not
cause a device Reset.
2: If the FWDTEN Configuration bit is ‘1’ (unprogrammed), the WDT is always enabled, regardless of the
SWDTEN bit setting.
3: Re-enabling the regulator after it enters Standby mode will add a delay, TVREG, when waking up from
Sleep. Applications that do not use the voltage regulator should set this bit to prevent this delay from
occurring.
Flag Bit Setting Event Clearing Event
TRAPR (RCON<15>) Trap Conflict Event POR
IOPUWR (RCON<14>) Illegal Opcode or Uninitialized W Register Access POR
CM (RCON<9>) Configuration Mismatch Reset POR
EXTR (RCON<7>) MCLR Reset POR
SWR (RCON<6>) RESET Instruction POR
WDTO (RCON<4>) WDT Time-out CLRWDT, PWRSAV
Instruction, POR
SLEEP (RCON<3>) PWRSAV #0 Instruction POR
IDLE (RCON<2>) PWRSAV #1 Instruction POR
BOR (RCON<1>) POR, BOR —
POR (RCON<0>) POR —
Note: All Reset flag bits may be set or cleared by the user software.
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DS39975A-page 88 2010 Microchip Technology Inc.
6.1 Special Function Register Reset
States
Most of the Special Function Registers (SFRs) associ-
ated with the PIC24F CPU and peripherals are reset to a
particular value at a device Reset. The SFRs are
grouped by their peripheral or CPU function and their
Reset values are specified in each section of this manual.
The Reset value for each SFR does not depend on the
type of Reset, with the exception of four registers. The
Reset value for the Reset Control register, RCON, will
depend on the type of device Reset. The Reset value
for the Oscillator Control register, OSCCON, will
depend on the type of Reset and the programmed
values of the FNOSC bits in Flash Configuration
Word 2 (CW2) (see Table 6-2). The RCFGCAL and
NVMCON registers are only affected by a POR.
6.2 Device Reset Times
The Reset times for various types of device Reset are
summarized in Table 6-3. Note that the system Reset
signal, SYSRST, is released after the POR delay time
expires.
The time at which the device actually begins to execute
code will also depend on the system oscillator delays,
which include the Oscillator Start-up Timer (OST) and
the PLL lock time. The OST and PLL lock times occur
in parallel with the applicable SYSRST delay times.
The Fail-Safe Clock Monitor (FSCM) delay determines
the time at which the FSCM begins to monitor the
system clock source after the SYSRST signal is
released.
6.3 Clock Source Selection at Reset
If clock switching is enabled, the system clock source at
device Reset is chosen, as shown in Table 6-2. If clock
switching is disabled, the system clock source is always
selected according to the oscillator Configuration bits.
Refer to Section 8.0 “Oscillator Configuration” for
further details.
TABLE 6-2: OSCILLATOR SELECTION vs.
TYPE OF RESET (CLOCK
SWITCHING ENABLED)
Reset Type Clock Source Determinant
POR FNOSC Configuration bits
(CW2<10:8>)
BOR
MCLR
COSC Control bits
(OSCCON<14:12>)
WDTO
SWR
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TABLE 6-3: RESET DELAY TIMES FOR VARIOUS DEVICE RESETS
Reset Type Clock Source SYSRST Delay System Clock
Delay Notes
POR(7) EC TPOR + TSTARTUP + TRST —1, 2, 3
ECPLL TPOR + TSTARTUP + TRST TLOCK 1, 2, 3, 5
XT, HS, SOSC TPOR + TSTARTUP + TRST TOST 1, 2, 3, 4
XTPLL, HSPLL TPOR + TSTARTUP + TRST TOST + TLOCK 1, 2, 3, 4, 5
FRC, FRCDIV TPOR + TSTARTUP + TRST TFRC 1, 2, 3, 6, 7
FRCPLL TPOR + TSTARTUP + TRST TFRC + TLOCK 1, 2, 3, 5, 6
LPRC TPOR + TSTARTUP + TRST TLPRC 1, 2, 3, 6
BOR EC TSTARTUP + TRST —2, 3
ECPLL TSTARTUP + TRST TLOCK 2, 3, 5
XT, HS, SOSC TSTARTUP + TRST TOST 2, 3, 4
XTPLL, HSPLL TSTARTUP + TRST TOST + TLOCK 2, 3, 4, 5
FRC, FRCDIV TSTARTUP + TRST TFRC 2, 3, 6, 7
FRCPLL TSTARTUP + TRST TFRC + TLOCK 2, 3, 5, 6
LPRC TSTARTUP + TRST TLPRC 2, 3, 6
MCLR Any Clock TRST —3
WDT Any Clock TRST —3
Software Any clock TRST —3
Illegal Opcode Any Clock TRST —3
Uninitialized W Any Clock TRST —3
Trap Conflict Any Clock TRST —3
Note 1: TPOR = Power-on Reset delay (10 s nominal).
2: T
STARTUP = TVREG (10 s nominal when VREGS = 1 and when VREGS = 0; depends upon
WUTSEL<1:0> bits setting).
3: TRST = Internal State Reset time (32 s nominal).
4: TOST = Oscillator Start-up Timer. A 10-bit counter counts 1024 oscillator periods before releasing the
oscillator clock to the system.
5: TLOCK = PLL lock time.
6: TFRC and TLPRC = RC Oscillator start-up times.
7: If Two-speed Start-up is enabled, regardless of the primary oscillator selected, the device starts with FRC
so the system clock delay is just TFRC, and in such cases, FRC start-up time is valid. It switches to the
primary oscillator after its respective clock delay.
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DS39975A-page 90 2010 Microchip Technology Inc.
6.3.1 POR AND LONG OSCILLATOR
START-UP TIMES
The oscillator start-up circuitry and its associated delay
timers are not linked to the device Reset delays that
occur at power-up. Some crystal circuits (especially
low-frequency crystals) will have a relatively long
start-up time. Therefore, one or more of the following
conditions is possible after SYSRST is released:
• The oscillator circuit has not begun to oscillate.
• The Oscillator Start-up Timer has not expired (if a
crystal oscillator is used).
• The PLL has not achieved a lock (if PLL is used).
The device will not begin to execute code until a valid
clock source has been released to the system. There-
fore, the oscillator and PLL start-up delays must be
considered when the Reset delay time must be known.
6.3.2 FAIL-SAFE CLOCK MONITOR
(FSCM) AND DEVICE RESETS
If the FSCM is enabled, it will begin to monitor the
system clock source when SYSRST is released. If a
valid clock source is not available at this time, the
device will automatically switch to the FRC oscillator
and the user can switch to the desired crystal oscillator
in the Trap Service Routine (TSR).
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7.0 INTERRUPT CONTROLLER
The PIC24F interrupt controller reduces the numerous
peripheral interrupt request signals to a single interrupt
request signal to the PIC24F CPU. It has the following
features:
• Up to 8 processor exceptions and software traps
• Seven user-selectable priority levels
• Interrupt Vector Table (IVT) with up to 118 vectors
• Unique vector for each interrupt or exception
source
• Fixed priority within a specified user priority level
• Alternate Interrupt Vector Table (AIVT) for debug
support
• Fixed interrupt entry and return latencies
7.1 Interrupt Vector Table
The Interrupt Vector Table (IVT) is shown in Figure 7-1.
The IVT resides in program memory, starting at location
000004h. The IVT contains 126 vectors, consisting of
8 non-maskable trap vectors, plus up to 118 sources of
interrupt. In general, each interrupt source has its own
vector. Each interrupt vector contains a 24-bit wide
address. The value programmed into each interrupt
vector location is the starting address of the associated
Interrupt Service Routine (ISR).
Interrupt vectors are prioritized in terms of their natural
priority; this is linked to their position in the vector table.
All other things being equal, lower addresses have a
higher natural priority. For example, the interrupt asso-
ciated with Vector 0 will take priority over interrupts at
any other vector address.
PIC24FJ256GB210 family devices implement
non-maskable traps and unique interrupts. These are
summarized in Table 7-1 and Table 7-2.
7.1.1 ALTERNATE INTERRUPT VECTOR
TABLE
The Alternate Interrupt Vector Table (AIVT) is located
after the IVT, as shown in Figure 7-1. The ALTIVT
(INTCON2<15>) control bit provides access to the
AIVT. If the ALTIVT bit is set, all interrupt and exception
processes will use the alternate vectors instead of the
default vectors. The alternate vectors are organized in
the same manner as the default vectors.
The AIVT supports emulation and debugging efforts by
providing a means to switch between an application
and a support environment without requiring the inter-
rupt vectors to be reprogrammed. This feature also
enables switching between applications for evaluation
of different software algorithms at run time. If the AIVT
is not needed, the AIVT should be programmed with
the same addresses used in the IVT.
7.2 Reset Sequence
A device Reset is not a true exception because the
interrupt controller is not involved in the Reset process.
The PIC24F devices clear their registers in response to
a Reset, which forces the PC to zero. The micro-
controller then begins program execution at location,
000000h. The user programs a GOTO instruction at the
Reset address, which redirects program execution to
the appropriate start-up routine.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 8. “Interrupts” (DS39707). The
information in this data sheet supersedes
the information in the FRM.
Note: Any unimplemented or unused vector
locations in the IVT and AIVT should be
programmed with the address of a default
interrupt handler routine that contains a
RESET instruction.
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FIGURE 7-1: PIC24F INTERRUPT VECTOR TABLE
TABLE 7-1: TRAP VECTOR DETAILS
Note 1: See Table 7-2 for the interrupt vector list.
Reset – GOTO Instruction 000000h
Reset – GOTO Address 000002h
Reserved 000004h
Oscillator Fail Trap Vector
Address Error Trap Vector
Stack Error Trap Vector
Math Error Trap Vector
Reserved
Reserved
Reserved
Interrupt Vector 0 000014h
Interrupt Vector 1
—
—
—
Interrupt Vector 52 00007Ch
Interrupt Vector 53 00007Eh
Interrupt Vector 54 000080h
—
—
—
Interrupt Vector 116 0000FCh
Interrupt Vector 117 0000FEh
Reserved 000100h
Reserved 000102h
Reserved
Oscillator Fail Trap Vector
Address Error Trap Vector
Stack Error Trap Vector
Math Error Trap Vector
Reserved
Reserved
Reserved
Interrupt Vector 0 000114h
Interrupt Vector 1
—
—
—
Interrupt Vector 52 00017Ch
Interrupt Vector 53 00017Eh
Interrupt Vector 54 000180h
—
—
—
Interrupt Vector 116
Interrupt Vector 117 0001FEh
Start of Code 000200h
Decreasing Natural Order Priority
Interrupt Vector Table (IVT)(1)
Alternate Interrupt Vector Table (AIVT)(1)
Vector Number IVT Address AIVT Address Trap Source
0 000004h 000104h Reserved
1 000006h 000106h Oscillator Failure
2 000008h 000108h Address Error
3 00000Ah 00010Ah Stack Error
4 00000Ch 00010Ch Math Error
5 00000Eh 00010Eh Reserved
6 000010h 000110h Reserved
7 000012h 000112h Reserved
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TABLE 7-2: IMPLEMENTED INTERRUPT VECTORS
Interrupt Source Vector
Number
IVT
Address
AIVT
Address
Interrupt Bit Locations
Flag Enable Priority
ADC1 Conversion Done 13 00002Eh 00012Eh IFS0<13> IEC0<13> IPC3<6:4>
Comparator Event 18 000038h 000138h IFS1<2> IEC1<2> IPC4<10:8>
CRC Generator 67 00009Ah 00019Ah IFS4<3> IEC4<3> IPC16<14:12>
CTMU Event 77 0000AEh 0001AEh IFS4<13> IEC4<13> IPC19<6:4>
External Interrupt 0 0 000014h 000114h IFS0<0> IEC0<0> IPC0<2:0>
External Interrupt 1 20 00003Ch 00013Ch IFS1<4> IEC1<4> IPC5<2:0>
External Interrupt 2 29 00004Eh 00014Eh IFS1<13> IEC1<13> IPC7<6:4>
External Interrupt 3 53 00007Eh 00017Eh IFS3<5> IEC3<5> IPC13<6:4>
External Interrupt 4 54 000080h 000180h IFS3<6> IEC3<6> IPC13<10:8>
I2C1 Master Event 17 000036h 000136h IFS1<1> IEC1<1> IPC4<6:4>
I2C1 Slave Event 16 000034h 000134h IFS1<0> IEC1<0> IPC4<2:0>
I2C2 Master Event 50 000078h 000178h IFS3<2> IEC3<2> IPC12<10:8>
I2C2 Slave Event 49 000076h 000176h IFS3<1> IEC3<1> IPC12<6:4>
I2C3 Master Event 85 0000BEh 0001BEh IFS5<5> IEC5<5> IPC21<6:4>
I2C3 Slave Event 84 0000BCh 0001BCh IFS5<4> IEC5<4> IPC21<2:0>
Input Capture 1 1 000016h 000116h IFS0<1> IEC0<1> IPC0<6:4>
Input Capture 2 5 00001Eh 00011Eh IFS0<5> IEC0<5> IPC1<6:4>
Input Capture 3 37 00005Eh 00015Eh IFS2<5> IEC2<5> IPC9<6:4>
Input Capture 4 38 000060h 000160h IFS2<6> IEC2<6> IPC9<10:8>
Input Capture 5 39 000062h 000162h IFS2<7> IEC2<7> IPC9<14:12>
Input Capture 6 40 000064h 000164h IFS2<8> IEC2<8> IPC10<2:0>
Input Capture 7 22 000040h 000140h IFS1<6> IEC1<6> IPC5<10:8>
Input Capture 8 23 000042h 000142h IFS1<7> IEC1<7> IPC5<14:12>
Input Capture 9 93 0000CEh 0001CEh IFS5<13> IEC5<13> IPC23<6:4>
Input Change Notification (ICN) 19 00003Ah 00013Ah IFS1<3> IEC1<3> IPC4<14:12>
Low-Voltage Detect (LVD) 72 0000A4h 0001A4h IFS4<8> IEC4<8> IPC18<2:0>
Output Compare 1 2 000018h 000118h IFS0<2> IEC0<2> IPC0<10:8>
Output Compare 2 6 000020h 000120h IFS0<6> IEC0<6> IPC1<10:8>
Output Compare 3 25 000046h 000146h IFS1<9> IEC1<9> IPC6<6:4>
Output Compare 4 26 000048h 000148h IFS1<10> IEC1<10> IPC6<10:8>
Output Compare 5 41 000066h 000166h IFS2<9> IEC2<9> IPC10<6:4>
Output Compare 6 42 000068h 000168h IFS2<10> IEC2<10> IPC10<10:8>
Output Compare 7 43 00006Ah 00016Ah IFS2<11> IEC2<11> IPC10<14:12>
Output Compare 8 44 00006Ch 00016Ch IFS2<12> IEC2<12> IPC11<2:0>
Output Compare 9 92 0000CCh 0001CCh IFS5<12> IEC5<12> IPC23<2:0>
Enhanced Parallel Master Port (EPMP) 45 00006Eh 00016Eh IFS2<13> IEC2<13> IPC11<6:4>
Real-Time Clock and Calendar (RTCC) 62 000090h 000190h IFS3<14> IEC3<14> IPC15<10:8>
SPI1 Error 9 000026h 000126h IFS0<9> IEC0<9> IPC2<6:4>
SPI1 Event 10 000028h 000128h IFS0<10> IEC0<10> IPC2<10:8>
SPI2 Error 32 000054h 000154h IFS2<0> IEC2<0> IPC8<2:0>
SPI2 Event 33 000056h 000156h IFS2<1> IEC2<1> IPC8<6:4>
SPI3 Error 90 0000C8h 0001C8h IFS5<10> IEC5<10> IPC22<10:8>
SPI3 Event 91 0000CAh 0001CAh IFS5<11> IEC5<11> IPC22<14:12>
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7.3 Interrupt Control and Status
Registers
The PIC24FJ256GB210 family of devices implements
a total of 37 registers for the interrupt controller:
• INTCON1
• INTCON2
• IFS0 through IFS5
• IEC0 through IEC5
• IPC0 through IPC23 (except IPC14 and IPC17)
•INTTREG
Global interrupt control functions are controlled from
INTCON1 and INTCON2. INTCON1 contains the Inter-
rupt Nesting Disable (NSTDIS) bit, as well as the
control and status flags for the processor trap sources.
The INTCON2 register controls the external interrupt
request signal behavior and the use of the Alternate
Interrupt Vector Table (AIVT).
The IFSx registers maintain all of the interrupt request
flags. Each source of interrupt has a status bit, which is
set by the respective peripherals or an external signal
and is cleared via software.
The IECx registers maintain all of the interrupt enable
bits. These control bits are used to individually enable
interrupts from the peripherals or external signals.
The IPCx registers are used to set the interrupt priority
level for each source of interrupt. Each user interrupt
source can be assigned to one of eight priority levels.
The INTTREG register contains the associated
interrupt vector number and the new CPU interrupt
priority level, which are latched into the Vector
Number (VECNUM<6:0>) and the Interrupt Priority
Level (ILR<3:0>) bit fields in the INTTREG register.
The new interrupt priority level is the priority of the
pending interrupt.
The interrupt sources are assigned to the IFSx, IECx
and IPCx registers in the order of their vector numbers,
as shown in Table 7-2. For example, the INT0 (External
Interrupt 0) is shown as having a vector number and a
natural order priority of 0. Thus, the INT0IF status bit is
found in IFS0<0>, the INT0IE enable bit in IEC0<0>
and the INT0IP<2:0> priority bits in the first position of
IPC0 (IPC0<2:0>).
Although they are not specifically part of the interrupt
control hardware, two of the CPU Control registers con-
tain bits that control interrupt functionality. The ALU
STATUS register (SR) contains the IPL<2:0> bits
(SR<7:5>). These indicate the current CPU interrupt
priority level. The user can change the current CPU
priority level by writing to the IPL bits.
Timer1 3 00001Ah 00011Ah IFS0<3> IEC0<3> IPC0<14:12>
Timer2 7 000022h 000122h IFS0<7> IEC0<7> IPC1<14:12>
Timer3 8 000024h 000124h IFS0<8> IEC0<8> IPC2<2:0>
Timer4 27 00004Ah 00014Ah IFS1<11> IEC1<11> IPC6<14:12>
Timer5 28 00004Ch 00014Ch IFS1<12> IEC1<12> IPC7<2:0>
UART1 Error 65 000096h 000196h IFS4<1> IEC4<1> IPC16<6:4>
UART1 Receiver 11 00002Ah 00012Ah IFS0<11> IEC0<11> IPC2<14:12>
UART1 Transmitter 12 00002Ch 00012Ch IFS0<12> IEC0<12> IPC3<2:0>
UART2 Error 66 000098h 000198h IFS4<2> IEC4<2> IPC16<10:8>
UART2 Receiver 30 000050h 000150h IFS1<14> IEC1<14> IPC7<10:8>
UART2 Transmitter 31 000052h 000152h IFS1<15> IEC1<15> IPC7<14:12>
UART3 Error 81 0000B6h 0001B6h IFS5<1> IEC5<1> IPC20<6:4>
UART3 Receiver 82 0000B8h 0001B8h IFS5<2> IEC5<2> IPC20<10:8>
UART3 Transmitter 83 0000BAh 0001BAh IFS5<3> IEC5<3> IPC20<14:12>
UART4 Error 87 0000C2h 0001C2h IFS5<7> IEC5<7> IPC21<14:12>
UART4 Receiver 88 0000C4h 0001C4h IFS5<8> IEC5<8> IPC22<2:0>
UART4 Transmitter 89 0000C6h 0001C6h IFS5<9> IEC5<9> IPC22<6:4>
USB Interrupt 86 0000C0h 0001C0h IFS5<6> IEC5<6> IPC21<10:8>
TABLE 7-2: IMPLEMENTED INTERRUPT VECTORS (CONTINUED)
Interrupt Source Vector
Number
IVT
Address
AIVT
Address
Interrupt Bit Locations
Flag Enable Priority
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The CORCON register contains the IPL3 bit, which,
together with IPL<2:0>, indicates the current CPU
priority level. IPL3 is a read-only bit so that trap events
cannot be masked by the user software.
The interrupt controller has the Interrupt Controller Test
register, INTTREG, which displays the status of the
interrupt controller. When an interrupt request occurs,
it’s associated vector number and the new interrupt pri-
ority level are latched into INTTREG. This information
can be used to determine a specific interrupt source if
a generic ISR is used for multiple vectors (such as
when ISR remapping is used in bootloader applica-
tions) or to check if another interrupt is pending while in
an ISR.
All interrupt registers are described in Register 7-1
through Register 7-38 in the succeeding pages.
REGISTER 7-1: SR: ALU STATUS REGISTER (IN CPU)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 R-0, HSC
— — — — — — — DC(1)
bit 15 bit 8
R/W-0, HSC R/W-0, HSC R/W-0, HSC R-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
IPL2(2,3) IPL1(2,3) IPL0(2,3) RA(1) N(1) OV(1) Z(1) C(1)
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-9 Unimplemented: Read as ‘0’
bit 7-5 IPL<2:0>: CPU Interrupt Priority Level Status bits(2,3)
111 = CPU interrupt priority level is 7 (15); user interrupts are disabled
110 = CPU interrupt priority level is 6 (14)
101 = CPU interrupt priority level is 5 (13)
100 = CPU interrupt priority level is 4 (12)
011 = CPU interrupt priority level is 3 (11)
010 = CPU interrupt priority level is 2 (10)
001 = CPU interrupt priority level is 1 (9)
000 = CPU interrupt priority level is 0 (8)
Note 1: See Register 3-1 for the description of the remaining bits (bits 8, 4, 3, 2, 1 and 0) that are not dedicated to
interrupt control functions.
2: The IPL bits are concatenated with the IPL3 (CORCON<3>) bit to form the CPU interrupt priority level.
The value in parentheses indicates the interrupt priority level if IPL3 = 1.
3: The IPL Status bits are read-only when NSTDIS (INTCON1<15>) = 1.
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REGISTER 7-2: CORCON: CPU CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 R/C-0, HSC r-1 U-0 U-0
— — — —IPL3
(1) r — —
bit 7 bit 0
Legend: r = Reserved bit C = Clearable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-4 Unimplemented: Read as ‘0’
bit 3 IPL3: CPU Interrupt Priority Level Status bit(1)
1 = CPU interrupt priority level is greater than 7
0 = CPU interrupt priority level is 7 or less
bit 2 Reserved: Read as ‘1’
bit 1-0 Unimplemented: Read as ‘0’
Note 1: The IPL3 bit is concatenated with the IPL<2:0> bits (SR<7:5>) to form the CPU interrupt priority level; see
Register 3-2 for bit description.
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REGISTER 7-3: INTCON1: INTERRUPT CONTROL REGISTER 1
R/W-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
NSTDIS — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS U-0
— — — MATHERR ADDRERR STKERR OSCFAIL —
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 NSTDIS: Interrupt Nesting Disable bit
1 = Interrupt nesting is disabled
0 = Interrupt nesting is enabled
bit 14-5 Unimplemented: Read as ‘0’
bit 4 MATHERR: Arithmetic Error Trap Status bit
1 = Overflow trap has occurred
0 = Overflow trap has not occurred
bit 3 ADDRERR: Address Error Trap Status bit
1 = Address error trap has occurred
0 = Address error trap has not occurred
bit 2 STKERR: Stack Error Trap Status bit
1 = Stack error trap has occurred
0 = Stack error trap has not occurred
bit 1 OSCFAIL: Oscillator Failure Trap Status bit
1 = Oscillator failure trap has occurred
0 = Oscillator failure trap has not occurred
bit 0 Unimplemented: Read as ‘0’
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REGISTER 7-4: INTCON2: INTERRUPT CONTROL REGISTER 2
R/W-0 R-0, HSC U-0 U-0 U-0 U-0 U-0 U-0
ALTIVT DISI — — — — — —
bit 15 bit 8
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — — INT4EP INT3EP INT2EP INT1EP INT0EP
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 ALTIVT: Enable Alternate Interrupt Vector Table bit
1 = Use Alternate Interrupt Vector Table
0 = Use standard (default) vector table
bit 14 DISI: DISI Instruction Status bit
1 = DISI instruction is active
0 = DISI instruction is not active
bit 13-5 Unimplemented: Read as ‘0’
bit 4 INT4EP: External Interrupt 4 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 3 INT3EP: External Interrupt 3 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 2 INT2EP: External Interrupt 2 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 1 INT1EP: External Interrupt 1 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 0 INT0EP: External Interrupt 0 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
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REGISTER 7-5: IFS0: INTERRUPT FLAG STATUS REGISTER 0
U-0 U-0 R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS
—— AD1IF U1TXIF U1RXIF SPI1IF SPF1IF T3IF
bit 15 bit 8
R/W-0, HS R/W-0, HS R/W-0, HS U-0 R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS
T2IF OC2IF IC2IF — T1IF OC1IF IC1IF INT0IF
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 AD1IF: A/D Conversion Complete Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12 U1TXIF: UART1 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11 U1RXIF: UART1 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10 SPI1IF: SPI1 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9 SPF1IF: SPI1 Fault Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8 T3IF: Timer3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7 T2IF: Timer2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6 OC2IF: Output Compare Channel 2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5 IC2IF: Input Capture Channel 2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4 Unimplemented: Read as ‘0’
bit 3 T1IF: Timer1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2 OC1IF: Output Compare Channel 1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
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bit 1 IC1IF: Input Capture Channel 1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0 INT0IF: External Interrupt 0 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
REGISTER 7-5: IFS0: INTERRUPT FLAG STATUS REGISTER 0 (CONTINUED)
REGISTER 7-6: IFS1: INTERRUPT FLAG STATUS REGISTER 1
R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS U-0
U2TXIF U2RXIF INT2IF T5IF T4IF OC4IF OC3IF —
bit 15 bit 8
R/W-0, HS R/W-0, HS U-0 R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS
IC8IF IC7IF — INT1IF CNIF CMIF MI2C1IF SI2C1IF
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 U2TXIF: UART2 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 14 U2RXIF: UART2 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13 INT2IF: External Interrupt 2 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12 T5IF: Timer5 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11 T4IF: Timer4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10 OC4IF: Output Compare Channel 4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9 OC3IF: Output Compare Channel 3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8 Unimplemented: Read as ‘0’
bit 7 IC8IF: Input Capture Channel 8 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6 IC7IF: Input Capture Channel 7 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
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bit 5 Unimplemented: Read as ‘0’
bit 4 INT1IF: External Interrupt 1 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 3 CNIF: Input Change Notification Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2 CMIF: Comparator Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1 MI2C1IF: Master I2C1 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0 SI2C1IF: Slave I2C1 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
REGISTER 7-6: IFS1: INTERRUPT FLAG STATUS REGISTER 1 (CONTINUED)
REGISTER 7-7: IFS2: INTERRUPT FLAG STATUS REGISTER 2
U-0 U-0 R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS
—— PMPIF OC8IF OC7IF OC6IF OC5IF IC6IF
bit 15 bit 8
R/W-0, HS R/W-0, HS R/W-0, HS U-0 U-0 U-0 R/W-0, HS R/W-0, HS
IC5IF IC4IF IC3IF — — — SPI2IF SPF2IF
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 PMPIF: Parallel Master Port Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12 OC8IF: Output Compare Channel 8 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11 OC7IF: Output Compare Channel 7 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10 OC6IF: Output Compare Channel 6 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9 OC5IF: Output Compare Channel 5 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
PIC24FJ256GB210 FAMILY
DS39975A-page 102 2010 Microchip Technology Inc.
bit 8 IC6IF: Input Capture Channel 6 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7 IC5IF: Input Capture Channel 5 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6 IC4IF: Input Capture Channel 4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5 IC3IF: Input Capture Channel 3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4-2 Unimplemented: Read as ‘0’
bit 1 SPI2IF: SPI2 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0 SPF2IF: SPI2 Fault Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
REGISTER 7-7: IFS2: INTERRUPT FLAG STATUS REGISTER 2 (CONTINUED)
2010 Microchip Technology Inc. DS39975A-page 103
PIC24FJ256GB210 FAMILY
REGISTER 7-8: IFS3: INTERRUPT FLAG STATUS REGISTER 3
U-0 R/W-0, HS U-0 U-0 U-0 U-0 U-0 U-0
—RTCIF— — — — — —
bit 15 bit 8
U-0 R/W-0, HS R/W-0, HS U-0 U-0 R/W-0, HS R/W-0, HS U-0
— INT4IF INT3IF ——MI2C2IFSI2C2IF—
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14 RTCIF: Real-Time Clock/Calendar Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13-7 Unimplemented: Read as ‘0’
bit 6 INT4IF: External Interrupt 4 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5 INT3IF: External Interrupt 3 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4-3 Unimplemented: Read as ‘0’
bit 2 MI2C2IF: Master I2C2 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1 SI2C2IF: Slave I2C2 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0 Unimplemented: Read as ‘0’
PIC24FJ256GB210 FAMILY
DS39975A-page 104 2010 Microchip Technology Inc.
REGISTER 7-9: IFS4: INTERRUPT FLAG STATUS REGISTER 4
U-0 U-0 R/W-0, HS U-0 U-0 U-0 U-0 R/W-0, HS
——CTMUIF————LVDIF
bit 15 bit 8
U-0 U-0 U-0 U-0 R/W-0, HS R/W-0, HS R/W-0, HS U-0
———— CRCIF U2ERIF U1ERIF —
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 CTMUIF: CTMU Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12-9 Unimplemented: Read as ‘0’
bit 8 LVDIF: Low-Voltage Detect Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7-4 Unimplemented: Read as ‘0’
bit 3 CRCIF: CRC Generator Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2 U2ERIF: UART2 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1 U1ERIF: UART1 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 105
PIC24FJ256GB210 FAMILY
REGISTER 7-10: IFS5: INTERRUPT FLAG STATUS REGISTER 5
U-0 U-0 R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS
—— IC9IF OC9IF SPI3IF SPF3IF U4TXIF U4RXIF
bit 15 bit 8
R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS R/W-0, HS U-0
U4ERIF USB1IF MI2C3IF SI2C3IF U3TXIF U3RXIF U3ERIF —
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 IC9IF: Input Capture Channel 9 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12 OC9IF: Output Compare Channel 9 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11 SPI3IF: SPI3 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10 SPF3IF: SPI3 Fault Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9 U4TXIF: UART4 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8 U4RXIF: UART4 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7 U4ERIF: UART4 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6 USB1IF: USB1 (USB OTG) Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5 MI2C3IF: Master I2C3 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4 SI2C3IF: Slave I2C3 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 3 U3TXIF: UART3 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2 U3RXIF: UART3 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
PIC24FJ256GB210 FAMILY
DS39975A-page 106 2010 Microchip Technology Inc.
bit 1 U3ERIF: UART3 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0 Unimplemented: Read as ‘0’
REGISTER 7-10: IFS5: INTERRUPT FLAG STATUS REGISTER 5 (CONTINUED)
REGISTER 7-11: IEC0: INTERRUPT ENABLE CONTROL REGISTER 0
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— AD1IE U1TXIE U1RXIE SPI1IE SPF1IE T3IE
bit 15 bit 8
R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0
T2IE OC2IE IC2IE — T1IE OC1IE IC1IE INT0IE
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 AD1IE: A/D Conversion Complete Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12 U1TXIE: UART1 Transmitter Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 11 U1RXIE: UART1 Receiver Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10 SPI1IE: SPI1 Transfer Complete Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9 SPF1IE: SPI1 Fault Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8 T3IE: Timer3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7 T2IE: Timer2 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6 OC2IE: Output Compare Channel 2 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5 IC2IE: Input Capture Channel 2 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 107
PIC24FJ256GB210 FAMILY
bit 3 T1IE: Timer1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2 OC1IE: Output Compare Channel 1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1 IC1IE: Input Capture Channel 1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0 INT0IE: External Interrupt 0 Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
REGISTER 7-11: IEC0: INTERRUPT ENABLE CONTROL REGISTER 0 (CONTINUED)
REGISTER 7-12: IEC1: INTERRUPT ENABLE CONTROL REGISTER 1
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0
U2TXIE U2RXIE INT2IE(1) T5IE T4IE OC4IE OC3IE —
bit 15 bit 8
R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
IC8IE IC7IE —INT1IE
(1) CNIE CMIE MI2C1IE SI2C1IE
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 U2TXIE: UART2 Transmitter Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 14 U2RXIE: UART2 Receiver Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13 INT2IE: External Interrupt 2 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12 T5IE: Timer5 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 11 T4IE: Timer4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10 OC4IE: Output Compare Channel 4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
Note 1: If an external interrupt is enabled, the interrupt input must also be configured to an available RPx or RPIx
pin. See Section 10.4 “Peripheral Pin Select (PPS)” for more information.
PIC24FJ256GB210 FAMILY
DS39975A-page 108 2010 Microchip Technology Inc.
bit 9 OC3IE: Output Compare Channel 3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8 Unimplemented: Read as ‘0’
bit 7 IC8IE: Input Capture Channel 8 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6 IC7IE: Input Capture Channel 7 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5 Unimplemented: Read as ‘0’
bit 4 INT1IE: External Interrupt 1 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 3 CNIE: Input Change Notification Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2 CMIE: Comparator Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1 MI2C1IE: Master I2C1 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0 SI2C1IE: Slave I2C1 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
REGISTER 7-12: IEC1: INTERRUPT ENABLE CONTROL REGISTER 1 (CONTINUED)
Note 1: If an external interrupt is enabled, the interrupt input must also be configured to an available RPx or RPIx
pin. See Section 10.4 “Peripheral Pin Select (PPS)” for more information.
2010 Microchip Technology Inc. DS39975A-page 109
PIC24FJ256GB210 FAMILY
REGISTER 7-13: IEC2: INTERRUPT ENABLE CONTROL REGISTER 2
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— PMPIE OC8IE OC7IE OC6IE OC5IE IC6IE
bit 15 bit 8
R/W-0 R/W-0 R/W-0 U-0 U-0 U-0 R/W-0 R/W-0
IC5IE IC4IE IC3IE — — — SPI2IE SPF2IE
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 PMPIE: Parallel Master Port Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12 OC8IE: Output Compare Channel 8 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 11 OC7IE: Output Compare Channel 7 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10 OC6IE: Output Compare Channel 6 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9 OC5IE: Output Compare Channel 5 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8 IC6IE: Input Capture Channel 6 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7 IC5IE: Input Capture Channel 5 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6 IC4IE: Input Capture Channel 4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5 IC3IE: Input Capture Channel 3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4-2 Unimplemented: Read as ‘0’
bit 1 SPI2IE: SPI2 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0 SPF2IE: SPI2 Fault Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
PIC24FJ256GB210 FAMILY
DS39975A-page 110 2010 Microchip Technology Inc.
REGISTER 7-14: IEC3: INTERRUPT ENABLE CONTROL REGISTER 3
U-0 R/W-0 U-0 U-0 U-0 U-0 U-0 U-0
—RTCIE— — — — — —
bit 15 bit 8
U-0 R/W-0 R/W-0 U-0 U-0 R/W-0 R/W-0 U-0
—INT4IE
(1) INT3IE(1) ——MI2C2IESI2C2IE—
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14 RTCIE: Real-Time Clock/Calendar Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13-7 Unimplemented: Read as ‘0’
bit 6 INT4IE: External Interrupt 4 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5 INT3IE: External Interrupt 3 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4-3 Unimplemented: Read as ‘0’
bit 2 MI2C2IE: Master I2C2 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1 SI2C2IE: Slave I2C2 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0 Unimplemented: Read as ‘0’
Note 1: If an external interrupt is enabled, the interrupt input must also be configured to an available RPx or RPIx
pin. See Section 10.4 “Peripheral Pin Select (PPS)” for more information.
2010 Microchip Technology Inc. DS39975A-page 111
PIC24FJ256GB210 FAMILY
REGISTER 7-15: IEC4: INTERRUPT ENABLE CONTROL REGISTER 4
U-0 U-0 R/W-0 U-0 U-0 U-0 U-0 R/W-0
——CTMUIE————LVDIE
bit 15 bit 8
U-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 U-0
———— CRCIE U2ERIE U1ERIE —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 CTMUIE: CTMU Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12-9 Unimplemented: Read as ‘0’
bit 8 LVDIE: Low-Voltage Detect Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7-4 Unimplemented: Read as ‘0’
bit 3 CRCIE: CRC Generator Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2 U2ERIE: UART2 Error Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1 U1ERIE: UART1 Error Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0 Unimplemented: Read as ‘0’
PIC24FJ256GB210 FAMILY
DS39975A-page 112 2010 Microchip Technology Inc.
REGISTER 7-16: IEC5: INTERRUPT ENABLE CONTROL REGISTER 5
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— IC9IE OC9IE SPI3IE SPF3IE U4TXIE U4RXIE
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0
U4ERIE USB1IE MI2C3IE SI2C3IE U3TXIE U3RXIE U3ERIE —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 IC9IE: Input Capture Channel 9 Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 12 OC9IE: Output Compare Channel 9 Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 11 SPI3IE: SPI3 Event Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 10 SPF3IE: SPI3 Fault Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 9 U4TXIE: UART4 Transmitter Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 8 U4RXIE: UART4 Receiver Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 7 U4ERIE: UART4 Error Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 6 USB1IE: USB1 (USB OTG) Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 5 MI2C3IE: Master I2C3 Event Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 4 SI2C3IE: Slave I2C3 Event Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 3 U3TXIE: UART3 Transmitter Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
bit 2 U3RXIE: UART3 Receiver Interrupt Enable bit
1 = Interrupt request enabled
0 = Interrupt request not enabled
2010 Microchip Technology Inc. DS39975A-page 113
PIC24FJ256GB210 FAMILY
bit 1 U3ERIE: UART3 Error Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0 Unimplemented: Read as ‘0’
REGISTER 7-16: IEC5: INTERRUPT ENABLE CONTROL REGISTER 5 (CONTINUED)
REGISTER 7-17: IPC0: INTERRUPT PRIORITY CONTROL REGISTER 0
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— T1IP2 T1IP1 T1IP0 — OC1IP2 OC1IP1 OC1IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— IC1IP2 IC1IP1 IC1IP0 — INT0IP2 INT0IP1 INT0IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 T1IP<2:0>: Timer1 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 OC1IP<2:0>: Output Compare Channel 1 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 IC1IP<2:0>: Input Capture Channel 1 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 INT0IP<2:0>: External Interrupt 0 Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
PIC24FJ256GB210 FAMILY
DS39975A-page 114 2010 Microchip Technology Inc.
REGISTER 7-18: IPC1: INTERRUPT PRIORITY CONTROL REGISTER 1
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— T2IP2 T2IP1 T2IP0 — OC2IP2 OC2IP1 OC2IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— IC2IP2 IC2IP1 IC2IP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 T2IP<2:0>: Timer2 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 OC2IP<2:0>: Output Compare Channel 2 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 IC2IP<2:0>: Input Capture Channel 2 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 115
PIC24FJ256GB210 FAMILY
REGISTER 7-19: IPC2: INTERRUPT PRIORITY CONTROL REGISTER 2
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— U1RXIP2 U1RXIP1 U1RXIP0 — SPI1IP2 SPI1IP1 SPI1IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— SPF1IP2 SPF1IP1 SPF1IP0 — T3IP2 T3IP1 T3IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 U1RXIP<2:0>: UART1 Receiver Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 SPI1IP<2:0>: SPI1 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 SPF1IP<2:0>: SPI1 Fault Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 T3IP<2:0>: Timer3 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
PIC24FJ256GB210 FAMILY
DS39975A-page 116 2010 Microchip Technology Inc.
REGISTER 7-20: IPC3: INTERRUPT PRIORITY CONTROL REGISTER 3
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— AD1IP2 AD1IP1 AD1IP0 — U1TXIP2 U1TXIP1 U1TXIP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-7 Unimplemented: Read as ‘0’
bit 6-4 AD1IP<2:0>: A/D Conversion Complete Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 U1TXIP<2:0>: UART1 Transmitter Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
2010 Microchip Technology Inc. DS39975A-page 117
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REGISTER 7-21: IPC4: INTERRUPT PRIORITY CONTROL REGISTER 4
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— CNIP2 CNIP1 CNIP0 —CMIP2CMIP1CMIP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— MI2C1IP2 MI2C1IP1 MI2C1IP0 — SI2C1IP2 SI2C1IP1 SI2C1IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 CNIP<2:0>: Input Change Notification Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 CMIP<2:0>: Comparator Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 MI2C1IP<2:0>: Master I2C1 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 SI2C1IP<2:0>: Slave I2C1 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
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DS39975A-page 118 2010 Microchip Technology Inc.
REGISTER 7-22: IPC5: INTERRUPT PRIORITY CONTROL REGISTER 5
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— IC8IP2 IC8IP1 IC8IP0 — IC7IP2 IC7IP1 IC7IP0
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-0 R/W-0
— — — — — INT1IP2 INT1IP1 INT1IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 IC8IP<2:0>: Input Capture Channel 8 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 IC7IP<2:0>: Input Capture Channel 7 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7-3 Unimplemented: Read as ‘0’
bit 2-0 INT1IP<2:0>: External Interrupt 1 Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
2010 Microchip Technology Inc. DS39975A-page 119
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REGISTER 7-23: IPC6: INTERRUPT PRIORITY CONTROL REGISTER 6
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— T4IP2 T4IP1 T4IP0 — OC4IP2 OC4IP1 OC4IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— OC3IP2 OC3IP1 OC3IP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 T4IP<2:0>: Timer4 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 OC4IP<2:0>: Output Compare Channel 4 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 OC3IP<2:0>: Output Compare Channel 3 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
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DS39975A-page 120 2010 Microchip Technology Inc.
REGISTER 7-24: IPC7: INTERRUPT PRIORITY CONTROL REGISTER 7
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— U2TXIP2 U2TXIP1 U2TXIP0 — U2RXIP2 U2RXIP1 U2RXIP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— INT2IP2 INT2IP1 INT2IP0 — T5IP2 T5IP1 T5IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 U2TXIP<2:0>: UART2 Transmitter Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 U2RXIP<2:0>: UART2 Receiver Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 INT2IP<2:0>: External Interrupt 2 Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 T5IP<2:0>: Timer5 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
2010 Microchip Technology Inc. DS39975A-page 121
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REGISTER 7-25: IPC8: INTERRUPT PRIORITY CONTROL REGISTER 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— SPI2IP2 SPI2IP1 SPI2IP0 — SPF2IP2 SPF2IP1 SPF2IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-7 Unimplemented: Read as ‘0’
bit 6-4 SPI2IP<2:0>: SPI2 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 SPF2IP<2:0>: SPI2 Fault Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
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DS39975A-page 122 2010 Microchip Technology Inc.
REGISTER 7-26: IPC9: INTERRUPT PRIORITY CONTROL REGISTER 9
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— IC5IP2 IC5IP1 IC5IP0 — IC4IP2 IC4IP1 IC4IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— IC3IP2 IC3IP1 IC3IP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 IC5IP<2:0>: Input Capture Channel 5 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 IC4IP<2:0>: Input Capture Channel 4 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 IC3IP<2:0>: Input Capture Channel 3 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 123
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REGISTER 7-27: IPC10: INTERRUPT PRIORITY CONTROL REGISTER 10
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— OC7IP2OC7IP1OC7IP0 — OC6IP2 OC6IP1 OC6IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— OC5IP2 OC5IP1 OC5IP0 — IC6IP2 IC6IP1 IC6IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 OC7IP<2:0>: Output Compare Channel 7 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 OC6IP<2:0>: Output Compare Channel 6 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 OC5IP<2:0>: Output Compare Channel 5 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 IC6IP<2:0>: Input Capture Channel 6 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
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DS39975A-page 124 2010 Microchip Technology Inc.
REGISTER 7-28: IPC11: INTERRUPT PRIORITY CONTROL REGISTER 11
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— PMPIP2 PMPIP1 PMPIP0 — OC8IP2 OC8IP1 OC8IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-7 Unimplemented: Read as ‘0’
bit 6-4 PMPIP<2:0>: Parallel Master Port Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 OC8IP<2:0>: Output Compare Channel 8 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
2010 Microchip Technology Inc. DS39975A-page 125
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REGISTER 7-29: IPC12: INTERRUPT PRIORITY CONTROL REGISTER 12
U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-0 R/W-0
— — — — — MI2C2IP2 MI2C2IP1 MI2C2IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— SI2C2IP2 SI2C2IP1 SI2C2IP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-11 Unimplemented: Read as ‘0’
bit 10-8 MI2C2IP<2:0>: Master I2C2 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 SI2C2IP<2:0>: Slave I2C2 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
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DS39975A-page 126 2010 Microchip Technology Inc.
REGISTER 7-30: IPC13: INTERRUPT PRIORITY CONTROL REGISTER 13
U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-0 R/W-0
— — — — — INT4IP2 INT4IP1 INT4IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— INT3IP2 INT3IP1 INT3IP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-11 Unimplemented: Read as ‘0’
bit 10-8 INT4IP<2:0>: External Interrupt 4 Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 INT3IP<2:0>: External Interrupt 3 Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 127
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REGISTER 7-31: IPC15: INTERRUPT PRIORITY CONTROL REGISTER 15
U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-0 R/W-0
— — — — — RTCIP2 RTCIP1 RTCIP0
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-11 Unimplemented: Read as ‘0’
bit 10-8 RTCIP<2:0>: Real-Time Clock and Calendar Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7-0 Unimplemented: Read as ‘0’
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DS39975A-page 128 2010 Microchip Technology Inc.
REGISTER 7-32: IPC16: INTERRUPT PRIORITY CONTROL REGISTER 16
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— CRCIP2 CRCIP1 CRCIP0 — U2ERIP2 U2ERIP1 U2ERIP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— U1ERIP2 U1ERIP1 U1ERIP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 CRCIP<2:0>: CRC Generator Error Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 U2ERIP<2:0>: UART2 Error Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 U1ERIP<2:0>: UART1 Error Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 129
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REGISTER 7-33: IPC18: INTERRUPT PRIORITY CONTROL REGISTER 18
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-0 R/W-0
— — — — — LVDIP2 LVDIP1 LVDIP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-3 Unimplemented: Read as ‘0’
bit 2-0 LVDIP<2:0>: Low-Voltage Detect Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
REGISTER 7-34: IPC19: INTERRUPT PRIORITY CONTROL REGISTER 19
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— CTMUIP2 CTMUIP1 CTMUIP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-7 Unimplemented: Read as ‘0’
bit 6-4 CTMUIP<2:0>: CTMU Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
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DS39975A-page 130 2010 Microchip Technology Inc.
REGISTER 7-35: IPC20: INTERRUPT PRIORITY CONTROL REGISTER 20
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— U3TXIP2 U3TXIP1 U3TXIP0 — U3RXIP2 U3RXIP1 U3RXIP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 U-0 U-0 U-0
— U3ERIP2 U3ERIP1 U3ERIP0 — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 U3TXIP<2:0>: UART3 Transmitter Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 U3RXIP<2:0>: UART3 Receiver Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 U3ERIP<2:0>: UART3 Error Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3-0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 131
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REGISTER 7-36: IPC21: INTERRUPT PRIORITY CONTROL REGISTER 21
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— U4ERIP2 U4ERIP1 U4ERIP0 — USB1IP2 USB1IP1 USB1IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— MI2C3IP2 MI2C3IP1 MI2C3IP0 — SI2C3IP2 SI2C3IP1 SI2C3IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 U4ERIP<2:0>: UART4 Error Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 USB1IP<2:0>: USB1 (USB OTG) Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 MI2C3IP<2:0>: Master I2C3 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 SI2C3IP<2:0>: Slave I2C3 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
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DS39975A-page 132 2010 Microchip Technology Inc.
REGISTER 7-37: IPC22: INTERRUPT PRIORITY CONTROL REGISTER 22
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— SPI3IP2 SPI3IP1 SPI3IP0 — SPF3IP2 SPF3IP1 SPF3IP0
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— U4TXIP2 U4TXIP1 U4TXIP0 — U4RXIP2 U4RXIP1 U4RXIP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 SPI3IP<2:0>: SPI3 Event Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-8 SPF3IP<2:0>: SPI3 Fault Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 7 Unimplemented: Read as ‘0’
bit 6-4 U4TXIP<2:0>: UART4 Transmitter Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 U4RXIP<2:0>: UART4 Receiver Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
2010 Microchip Technology Inc. DS39975A-page 133
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REGISTER 7-38: IPC23: INTERRUPT PRIORITY CONTROL REGISTER 23
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 R/W-1 R/W-0 R/W-0 U-0 R/W-1 R/W-0 R/W-0
— IC9IP2 IC9IP1 IC9IP0 — OC9IP2 OC9IP1 OC9IP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-7 Unimplemented: Read as ‘0’
bit 6-4 IC9IP<2:0>: Input Capture Channel 9 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
bit 3 Unimplemented: Read as ‘0’
bit 2-0 OC9IP<2:0>: Output Compare Channel 9 Interrupt Priority bits
111 = Interrupt is priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is priority 1
000 = Interrupt source is disabled
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DS39975A-page 134 2010 Microchip Technology Inc.
REGISTER 7-39: INTTREG: INTERRUPT CONTROLLER TEST REGISTER
R-0, HSC U-0 R/W-0 U-0 R-0, HSC R-0, HSC R-0, HSC R-0, HSC
CPUIRQ —VHOLD— ILR3ILR2ILR1ILR0
bit 15 bit 8
U-0 R-0, HSC R-0, HSC R-0, HSC R-0, HSC R-0, HSC R-0, HSC R-0, HSC
— VECNUM6 VECNUM5 VECNUM4 VECNUM3 VECNUM2 VECNUM1 VECNUM0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CPUIRQ: Interrupt Request from Interrupt Controller CPU bit
1 = An interrupt request has occurred but has not yet been Acknowledged by the CPU; this happens
when the CPU priority is higher than the interrupt priority
0 = No interrupt request is unacknowledged
bit 14 Unimplemented: Read as ‘0’
bit 13 VHOLD: Vector Number Capture Configuration bit
1 = The VECNUM bits contain the value of the highest priority pending interrupt
0 = The VECNUM bits contain the value of the last Acknowledged interrupt (i.e., the last interrupt that
has occurred with higher priority than the CPU, even if other interrupts are pending)
bit 12 Unimplemented: Read as ‘0’
bit 11-8 ILR<3:0>: New CPU Interrupt Priority Level bits
1111 = CPU Interrupt Priority Level is 15
•
•
•
0001 = CPU Interrupt Priority Level is 1
0000 = CPU Interrupt Priority Level is 0
bit 7 Unimplemented: Read as ‘0’
bit 6-0 VECNUM<5:0>: Vector Number of Pending Interrupt or Last Acknowledged Interrupt bits
VHOLD = 1: The VECNUM bits indicate the vector number (from 0 to 118) of the last interrupt to occur
VHOLD = 0: The VECNUM bits indicate the vector number (from 0 to 118) of the interrupt request
currently being handled
2010 Microchip Technology Inc. DS39975A-page 135
PIC24FJ256GB210 FAMILY
7.4 Interrupt Setup Procedures
7.4.1 INITIALIZATION
To configure an interrupt source:
1. Set the NSTDIS (INTCON1<15>) control bit if
nested interrupts are not desired.
2. Select the user-assigned priority level for the
interrupt source by writing the control bits in the
appropriate IPCx register. The priority level will
depend on the specific application and type of
interrupt source. If multiple priority levels are not
desired, the IPCx register control bits for all
enabled interrupt sources may be programmed
to the same non-zero value.
3. Clear the interrupt flag status bit associated with
the peripheral in the associated IFSx register.
4. Enable the interrupt source by setting the
interrupt enable control bit associated with the
source in the appropriate IECx register.
7.4.2 INTERRUPT SERVICE ROUTINE
(ISR)
The method that is used to declare an Interrupt Service
Routine (ISR) and initialize the IVT with the correct vec-
tor address will depend on the programming language
(i.e., ‘C’ or assembler) and the language development
toolsuite that is used to develop the application. In
general, the user must clear the interrupt flag in the
appropriate IFSx register for the source of the interrupt
that the ISR handles. Otherwise, the ISR will be
re-entered immediately after exiting the routine. If the
ISR is coded in assembly language, it must be termi-
nated using a RETFIE instruction to unstack the saved
PC value, SRL value and old CPU priority level.
7.4.3 TRAP SERVICE ROUTINE (TSR)
A Trap Service Routine (TSR) is coded like an ISR,
except that the appropriate trap status flag in the
INTCON1 register must be cleared to avoid re-entry
into the TSR.
7.4.4 INTERRUPT DISABLE
All user interrupts can be disabled using the following
procedure:
1. Push the current SR value onto the software
stack using the PUSH instruction.
2. Force the CPU to Priority Level 7 by inclusive
ORing the value 0Eh with SRL.
To enable user interrupts, the POP instruction may be
used to restore the previous SR value.
Note that only user interrupts with a priority level of 7 or
less can be disabled. Trap sources (Levels 8-15)
cannot be disabled.
The DISI instruction provides a convenient way to
disable interrupts of Priority Levels, 1-6, for a fixed
period of time. Level 7 interrupt sources are not
disabled by the DISI instruction.
Note: At a device Reset, the IPCx registers are
initialized, such that all user interrupt
sources are assigned to Priority Level 4.
PIC24FJ256GB210 FAMILY
DS39975A-page 136 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 137
PIC24FJ256GB210 FAMILY
8.0 OSCILLATOR
CONFIGURATION
The oscillator system for PIC24FJ256GB210 family
devices has the following features:
• A total of four external and internal oscillator options
as clock sources, providing 11 different clock modes
• An on-chip PLL block to boost internal operating
frequency on select internal and external oscillator
sources, and to provide a precise clock source for
peripherals, such as USB
• Software controllable switching between various
clock sources
• Software controllable postscaler for selective
clocking of CPU for system power savings
• A Fail-Safe Clock Monitor (FSCM) that detects
clock failure and permits safe application recovery
or shutdown
• A separate and independently configurable system
clock output for synchronizing external hardware
A simplified diagram of the oscillator system is shown
in Figure 8-1.
FIGURE 8-1: PIC24FJ256GB210 FAMILY CLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 6. “Oscillator” (DS39700). The
information in this data sheet supersedes
the information in the FRM.
Secondary Oscillator
SOSCEN
Enable
Oscillator
SOSCO
SOSCI
Clock Source Option
for Other Modules
OSCI
OSCO
Primary Oscillator
XT, HS, EC
CPU
Peripherals
Postscaler
CLKDIV<10:8>
WDT, PWRT
8 MHz
FRCDIV
31 kHz (nominal)
FRC
Oscillator
LPRC
Oscillator
SOSC
LPRC
Postscaler
Clock Control Logic
Fail-Safe
Clock
Monitor
CLKDIV<14:12>
FRC CLKO
(nominal)
XTPLL, HSPLL
ECPLL,FRCPLL
8 MHz
4 MHz
PLL
DIV
PLLDIV<2:0> CPDIV<1:0>
48 MHz USB Clock
USB PLL
Reference Clock
Generator
REFO
REFOCON<15:8>
&
PIC24FJ256GB210 Family
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DS39975A-page 138 2010 Microchip Technology Inc.
8.1 CPU Clocking Scheme
The system clock source can be provided by one of
four sources:
• Primary Oscillator (POSC) on the OSCI and
OSCO pins
• Secondary Oscillator (SOSC) on the SOSCI and
SOSCO pins
• Fast Internal RC (FRC) Oscillator
• Low-Power Internal RC (LPRC) Oscillator
The primary oscillator and FRC sources have the
option of using the internal 24x PLL block, which
generates the USB module clock, and a separate
system clock through the 96 MHZ PLL. Refer to
Section 8.5 “96 MHz PLL Block” for additional
information.
The internal FRC provides an 8 MHz clock source. It
can optionally be reduced by the programmable clock
divider to provide a range of system clock frequencies.
The selected clock source generates the processor
and peripheral clock sources. The processor clock
source is divided by two to produce the internal instruc-
tion cycle clock, FCY. In this document, the instruction
cycle clock is also denoted by FOSC/2. The internal
instruction cycle clock, FOSC/2, can be provided on the
OSCO I/O pin for some operating modes of the primary
oscillator.
8.2 Initial Configuration on POR
The oscillator source (and operating mode) that is used
at a device Power-on Reset (POR) event is selected
using Configuration bit settings. The oscillator Configu-
ration bit settings are located in the Configuration
registers in the program memory (refer to Section 26.1
“Configuration Bits” for further details). The Primary
Oscillator Configuration bits, POSCMD<1:0> (Configu-
ration Word 2<1:0>) and the Initial Oscillator Select
Configuration bits, FNOSC<2:0> (Configuration
Word 2<10:8>), select the oscillator source that is used
at a POR. The FRC primary Oscillator with Postscaler
(FRCDIV) is the default (unprogrammed) selection. The
secondary oscillator, or one of the internal oscillators,
may be chosen by programming these bit locations.
The Configuration bits allow users to choose between
the various clock modes, shown in Table 8-1.
8.2.1 CLOCK SWITCHING MODE
CONFIGURATION BITS
The FCKSM Configuration bits (Configuration
Word 2<7:6>) are used to jointly configure device clock
switching and the Fail-Safe Clock Monitor (FSCM).
Clock switching is enabled only when FCKSM1 is
programmed (‘0’). The FSCM is enabled only when
FCKSM<1:0> are both programmed (‘00’).
TABLE 8-1: CONFIGURATION BIT VALUES FOR CLOCK SELECTION
Oscillator Mode Oscillator Source POSCMD<1:0> FNOSC<2:0> Notes
Fast RC Oscillator with Postscaler
(FRCDIV)
Internal 11 111 1, 2
FRC Oscillator/16 (500 KHz) Internal 11 110 1
Low-Power RC Oscillator (LPRC) Internal 11 101 1
Secondary (Timer1) Oscillator
(SOSC)
Secondary 11 100 1
Primary Oscillator (XT) with PLL
Module (XTPLL)
Primary 01 011 —
Primary Oscillator (EC) with PLL
Module (ECPLL)
Primary 00 011 1
Primary Oscillator (HS) Primary 10 010 —
Primary Oscillator (XT) Primary 01 010 —
Primary Oscillator (EC) Primary 00 010 1
Fast RC Oscillator with PLL Module
(FRCPLL)
Internal 11 001 1
Fast RC Oscillator (FRC) Internal 11 000 1
Note 1: OSCO pin function is determined by the OSCIOFCN Configuration bit.
2: This is the default oscillator mode for an unprogrammed (erased) device.
2010 Microchip Technology Inc. DS39975A-page 139
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8.3 Control Registers
The following four Special Function Registers control
the operation of the oscillator:
• OSCCON
•CLKDIV
•OSCTUN
• REFOCON
The OSCCON register (Register 8-1) is the main con-
trol register for the oscillator. It controls clock source
switching and allows the monitoring of clock sources.
The CLKDIV register (Register 8-2) controls the
features associated with Doze mode, as well as the
postscaler for the FRC oscillator.
The OSCTUN register (Register 8-3) allows the user to
fine tune the FRC oscillator over a range of
approximately ±1.5%.
The REFOCON register (Register 8-5) controls the
frequency of the reference clock out.
REGISTER 8-1: OSCCON: OSCILLATOR CONTROL REGISTER
U-0 R-x, HSC(1) R-x, HSC(1) R-x, HSC(1) U-0 R/W-x(1) R/W-x(1) R/W-x(1)
— COSC2 COSC1 COSC0 — NOSC2 NOSC1 NOSC0
bit 15 bit 8
R/S-0 R/W-0 R-0, HSC(3) U-0 R/C-0, HS R/W-0 R/W-0 R/W-0
CLKLOCK IOLOCK(2) LOCK — CF POSCEN SOSCEN OSWEN
bit 7 bit 0
Legend: C = Clearable bit S = Settable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
HS = Hardware Settable bit
bit 15 Unimplemented: Read as ‘0’
bit 14-12 COSC<2:0>: Current Oscillator Selection bits(1)
111 = Fast RC Oscillator with Postscaler (FRCDIV)
110 = Fast RC/16 Oscillator
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)
010 = Primary Oscillator (XT, HS, EC)
001 = Fast RC Oscillator with Postscaler and PLL module (FRCPLL)
000 = Fast RC Oscillator (FRC)
bit 11 Unimplemented: Read as ‘0’
bit 10-8 NOSC<2:0>: New Oscillator Selection bits(1)
111 = Fast RC Oscillator with Postscaler (FRCDIV)
110 = Fast RC/16 Oscillator
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)
010 = Primary Oscillator (XT, HS, EC)
001 = Fast RC Oscillator with Postscaler and PLL module (FRCPLL)
000 = Fast RC Oscillator (FRC)
Note 1: Reset values for these bits are determined by the FNOSC Configuration bits.
2: The state of the IOLOCK bit can only be changed once an unlocking sequence has been executed. In
addition, if the IOL1WAY Configuration bit is ‘1’, once the IOLOCK bit is set, it cannot be cleared.
3: Also resets to ‘0’ during any valid clock switch or whenever a non PLL Clock mode is selected.
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DS39975A-page 140 2010 Microchip Technology Inc.
bit 7 CLKLOCK: Clock Selection Lock Enabled bit
If FSCM is enabled (FCKSM1 = 1):
1 = Clock and PLL selections are locked
0 = Clock and PLL selections are not locked and may be modified by setting the OSWEN bit
If FSCM is disabled (FCKSM1 = 0):
Clock and PLL selections are never locked and may be modified by setting the OSWEN bit.
bit 6 IOLOCK: I/O Lock Enable bit(2)
1 = I/O lock is active
0 = I/O lock is not active
bit 5 LOCK: PLL Lock Status bit(3)
1 = PLL module is in lock or PLL module start-up timer is satisfied
0 = PLL module is out of lock, PLL start-up timer is running or PLL is disabled
bit 4 Unimplemented: Read as ‘0’
bit 3 CF: Clock Fail Detect bit
1 = FSCM has detected a clock failure
0 = No clock failure has been detected
bit 2 POSCEN: Primary Oscillator Sleep Enable bit
1 = Primary Oscillator continues to operate during Sleep mode
0 = Primary Oscillator is disabled during Sleep mode
bit 1 SOSCEN: 32 kHz Secondary Oscillator (SOSC) Enable bit
1 = Enable the Secondary Oscillator
0 = Disable the Secondary Oscillator
bit 0 OSWEN: Oscillator Switch Enable bit
1 = Initiate an oscillator switch to the clock source specified by the NOSC<2:0> bits
0 = Oscillator switch is complete
REGISTER 8-1: OSCCON: OSCILLATOR CONTROL REGISTER (CONTINUED)
Note 1: Reset values for these bits are determined by the FNOSC Configuration bits.
2: The state of the IOLOCK bit can only be changed once an unlocking sequence has been executed. In
addition, if the IOL1WAY Configuration bit is ‘1’, once the IOLOCK bit is set, it cannot be cleared.
3: Also resets to ‘0’ during any valid clock switch or whenever a non PLL Clock mode is selected.
2010 Microchip Technology Inc. DS39975A-page 141
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REGISTER 8-2: CLKDIV: CLOCK DIVIDER REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-1
ROI DOZE2 DOZE1 DOZE0 DOZEN(1) RCDIV2 RCDIV1 RCDIV0
bit 15 bit 8
R/W-0 R/W-0 R/W-0 r-0 U-0 U-0 U-0 U-0
CPDIV1 CPDIV0 PLLEN Reserved — — — —
bit 7 bit 0
Legend: r = Reserved bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 ROI: Recover on Interrupt bit
1 = Interrupts clear the DOZEN bit and reset the CPU peripheral clock ratio to 1:1
0 = Interrupts have no effect on the DOZEN bit
bit 14-12 DOZE<2:0>: CPU Peripheral Clock Ratio Select bits
111 = 1:128
110 = 1:64
101 = 1:32
100 = 1:16
011 = 1:8
010 = 1:4
001 = 1:2
000 = 1:1
bit 11 DOZEN: DOZE Enable bit(1)
1 = DOZE<2:0> bits specify the CPU peripheral clock ratio
0 = CPU peripheral clock ratio is set to 1:1
bit 10-8 RCDIV<2:0>: FRC Postscaler Select bits
111 = 31.25 kHz (divide-by-256)
110 = 125 kHz (divide-by-64)
101 = 250 kHz (divide-by-32)
100 = 500 kHz (divide-by-16)
011 = 1 MHz (divide-by-8)
010 = 2 MHz (divide-by-4)
001 = 4 MHz (divide-by-2)
000 = 8 MHz (divide-by-1)
bit 7-6 CPDIV<1:0>: System Clock Select bits (postscaler select from 32 MHz clock branch)
11 = 4 MHz (divide-by-8)(2)
10 = 8 MHz (divide-by-4)(2)
01 = 16 MHz (divide-by-2)
00 = 32 MHz (divide-by-1)
bit 5 PLLEN: 96 MHz PLL Enable bit
The 96 MHz PLL must be enabled when the USB module is enabled. This control bit can be overridden
by the PLL96MHZ (Configuration Word 2 <11>) Configuration bit.
1 = Enable the 96 MHz PLL for USB or HSPLL/ECPLL/FRCPLL operation
0 = Disable the 96 MHz PLL
bit 4 Reserved: Reserved bit; do not use
bit 3-0 Unimplemented: Read as ‘0’
Note 1: This bit is automatically cleared when the ROI bit is set and an interrupt occurs.
2: This setting is not allowed while the USB module is enabled.
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REGISTER 8-3: OSCTUN: FRC OSCILLATOR TUNE REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— TUN5(1) TUN4(1) TUN3(1) TUN2(1) TUN1(1) TUN0(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-6 Unimplemented: Read as ‘0’
bit 5-0 TUN<5:0>: FRC Oscillator Tuning bits(1)
011111 = Maximum frequency deviation
011110 =
·
·
·
000001 =
000000 = Center frequency, oscillator is running at factory calibrated frequency
111111 =
·
·
·
100001 =
100000 = Minimum frequency deviation
Note 1: Increments or decrements of TUN<5:0> may not change the FRC frequency in equal steps over the FRC
tuning range and may not be monotonic.
2010 Microchip Technology Inc. DS39975A-page 143
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8.4 Clock Switching Operation
With few limitations, applications are free to switch
between any of the four clock sources (POSC, SOSC,
FRC and LPRC) under software control and at any
time. To limit the possible side effects that could result
from this flexibility, PIC24F devices have a safeguard
lock built into the switching process.
8.4.1 ENABLING CLOCK SWITCHING
To enable clock switching, the FCKSM1 Configuration
bit in CW2 must be programmed to ‘0’. (Refer to
Section 26.1 “Configuration Bits” for further details.)
If the FCKSM1 Configuration bit is unprogrammed (‘1’),
the clock switching function and Fail-Safe Clock Monitor
function are disabled. This is the default setting.
The NOSCx (OSCCON<10:8>) control bits do not
control the clock selection when clock switching is
disabled. However, the COSCx (OSCCON<14:12>)
control bits will reflect the clock source selected by the
FNOSCx Configuration bits.
The OSWEN (OSCCON<0>) control bit has no effect
when clock switching is disabled; It is held at ‘0’ at all
times.
8.4.2 OSCILLATOR SWITCHING
SEQUENCE
At a minimum, performing a clock switch requires this
basic sequence:
1. If desired, read the COSCx (OSCCON<14:12>)
control bits to determine the current oscillator
source.
2. Perform the unlock sequence to allow a write to
the OSCCON register high byte.
3. Write the appropriate value to the NOSCx
(OSCCON<10:8>) control bits for the new
oscillator source.
4. Perform the unlock sequence to allow a write to
the OSCCON register low byte.
5. Set the OSWEN bit to initiate the oscillator
switch.
Once the basic sequence is completed, the system
clock hardware responds automatically as follows:
1. The clock switching hardware compares the
COSCx bits with the new value of the NOSCx
bits. If they are the same, then the clock switch
is a redundant operation. In this case, the
OSWEN bit is cleared automatically and the
clock switch is aborted.
2. If a valid clock switch has been initiated, the
LOCK (OSCCON<5>) and CF (OSCCON<3>)
bits are cleared.
3. The new oscillator is turned on by the hardware
if it is not currently running. If a crystal oscillator
must be turned on, the hardware will wait until
the OST expires. If the new source is using the
PLL, then the hardware waits until a PLL lock is
detected (LOCK = 1).
4. The hardware waits for 10 clock cycles from the
new clock source and then performs the clock
switch.
5. The hardware clears the OSWEN bit to indicate a
successful clock transition. In addition, the
NOSCx bit values are transferred to the COSCx
bits.
6. The old clock source is turned off at this time,
with the exception of LPRC (if WDT or FSCM
are enabled) or SOSC (if SOSCEN remains
set).
Note: The Primary Oscillator mode has three
different submodes (XT, HS and EC)
which are determined by the POSCMDx
Configuration bits. While an application
can switch to and from Primary Oscillator
mode in software, it cannot switch
between the different primary submodes
without reprogramming the device.
Note 1: The processor will continue to execute
code throughout the clock switching
sequence. Timing-sensitive code should
not be executed during this time.
2: Direct clock switches between any
Primary Oscillator mode with PLL and
FRCPLL modes are not permitted. This
applies to clock switches in either direc-
tion. In these instances, the application
must switch to FRC mode as a transition
clock source between the two PLL
modes.
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DS39975A-page 144 2010 Microchip Technology Inc.
A recommended code sequence for a clock switch
includes the following:
1. Disable interrupts during the OSCCON register
unlock and write sequence.
2. Execute the unlock sequence for the OSCCON
high byte by writing 78h and 9Ah to
OSCCON<15:8> in two back-to-back instructions.
3. Write new oscillator source to the NOSCx bits in
the instruction immediately following the unlock
sequence.
4. Execute the unlock sequence for the OSCCON
low byte by writing 46h and 57h to
OSCCON<7:0> in two back-to-back instructions.
5. Set the OSWEN bit in the instruction immediately
following the unlock sequence.
6. Continue to execute code that is not
clock-sensitive (optional).
7. Invoke an appropriate amount of software delay
(cycle counting) to allow the selected oscillator
and/or PLL to start and stabilize.
8. Check to see if OSWEN is ‘0’. If it is, the switch
was successful. If OSWEN is still set, then check
the LOCK bit to determine the cause of failure.
The core sequence for unlocking the OSCCON register
and initiating a clock switch is shown in Example 8-1.
EXAMPLE 8-1: BASIC CODE SEQUENCE
FOR CLOCK SWITCHING
IN ASSEMBLY
8.5 96 MHz PLL Block
The 96 MHz PLL block is implemented to generate the
stable 48 MHz clock required for full-speed USB
operation and the system clock from the same oscillator
source. The 96 MHz PLL block is shown in Figure 8-2.
The 96 MHz PLL block requires a 4 MHz input signal; it
uses this to generate a 96 MHz signal from a fixed, 24x
PLL. This is, in turn, divided into two branches. The first
branch generates the USB clock and the second branch
generates the system clock. The 96 MHz PLL block can
be enabled and disabled using the PLL96MHZ Configu-
ration bit (Configuration Word<11>) or through the
PLLEN (CLKDIV<5>) control bit when the PLL96MHZ
Configuration bit is not set. Note that the PLL96MHZ
Configuration bit and PLLEN register bit are available
only for PIC24F devices with USB.
The 96 MHz PLL prescaler does not automatically
sense the incoming oscillator frequency. The user must
manually configure the PLL divider to generate the
required 4 MHz output, using the PLLDIV<2:0> Config-
uration bits (Configuration Word 2<14:12> in most
devices).
;Place the new oscillator selection in W0
;OSCCONH (high byte) Unlock Sequence
MOV #OSCCONH, w1
MOV #0x78, w2
MOV #0x9A, w3
MOV.b w2, [w1]
MOV.b w3, [w1]
;Set new oscillator selection
MOV.b WREG, OSCCONH
;OSCCONL (low byte) unlock sequence
MOV #OSCCONL, w1
MOV #0x46, w2
MOV #0x57, w3
MOV.b w2, [w1]
MOV.b w3, [w1]
;Start oscillator switch operation
BSET OSCCON,#0
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FIGURE 8-2: 96 MHz PLL BLOCK
8.5.1 SYSTEM CLOCK GENERATION
The system clock is generated from the 96 MHz branch
using a configurable postscaler/divider to generate a
range of frequencies for the system clock multiplexer.
The output of the multiplexer is further passed through
a fixed divide-by-3 divider and the final output is used
as the system clock. Figure 8-2 shows this logic in the
system clock sub-block. Since the source is a 96 MHz
signal, the possible system clock frequencies are listed
in Table 8-2. The available system clock options are
always the same, regardless of the setting of the
PLLDIV Configuration bits.
TABLE 8-2: SYSTEM CLOCK OPTIONS FOR 96 MHz PLL BLOCK
PLL
96 MHz
PLL
3
2
Prescaler
4 MHz
PLL
Prescaler
48 MHz Clock
for USB Module
PLL Output
for System Clock
CPDIV<1:0>
PLLDIV<2:0>
Input from
POSC
Input from
FRC
FNOSC<2:0>
(4 MHz or
8 MHz)
00
01
10
11
32 MHz
111
110
101
100
011
010
001
000
12
8
8
6
5
4
3
2
1
4
2
1
MCU Clock Division
(CPDIV<1:0>)
System Clock Frequency
(Instruction Rate in MIPS)
None (00)32MHz (16)
2 (01)16MHz (8)
4 (10)8MHz (4)
(1)
8 (11)4MHz (2)
(1)
Note 1: These options are not compatible with USB operation. They may be used whenever the PLL branch is
selected and the USB module is disabled.
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8.5.2 USB CLOCK GENERATION
In the USB-On-The-Go module in the
PIC24FJ256GB210 family of devices, the primary
oscillator with the PLL block can be used as a valid
clock source for USB operation. The FRC oscillator
(implemented with ±1.0% accuracy) can be combined
with a PLL block, providing another option for a valid
USB clock source. There is no provision to provide a
separate external 48 MHz clock to the USB module.
The USB module sources its clock signal from a
96 MHz PLL. Due to the requirement that a 4 MHz input
must be provided to generate the 96 MHz signal, the
oscillator operation is limited to a range of possible val-
ues. Table 8-3 shows the valid oscillator configurations
(i.e., ECPLL, HSPLL, XTPLL and FRCPLL) for USB
operation. This sets the correct PLLDIV configuration
for the specified oscillator frequency and the output
frequency of the USB clock branch is always 48 MHz.
TABLE 8-3: VALID OSCILLATOR CONFIGURATIONS FOR USB OPERATIONS
Input Oscillator Frequency Clock Mode PLL Division
(PLLDIV<2:0>)
48 MHz ECPLL 12 (111)
32 MHz HSPLL, ECPLL 8 (110)
24 MHz HSPLL, ECPLL 6 (101)
20 MHz HSPLL, ECPLL 5 (100)
16 MHz HSPLL, ECPLL 4 (011)
12 MHz HSPLL, ECPLL 3 (010)
8 MHz ECPLL, HSPLL, XTPLL, FRCPLL 2 (001)
4 MHz ECPLL, HSPLL, XTPLL, FRCPLL 1 (000)
Note: For USB devices, the use of a primary oscillator or external clock source, with a frequency above 32 MHz,
does not imply that the device’s system clock can be run at the same speed when the USB module is not
used. The maximum system clock for all PIC24F devices is 32 MHz.
2010 Microchip Technology Inc. DS39975A-page 147
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8.5.3 CONSIDERATIONS FOR USB
OPERATION
When using the USB On-The-Go module in
PIC24FJ256GB210 family devices, users must always
observe these rules in configuring the system clock:
• For USB operation, the selected clock source
(EC, HS or XT) must meet the USB clock
tolerance requirements.
• The Primary Oscillator/PLL modes are the only
oscillator configurations that permit USB opera-
tion. There is no provision to provide a separate
external clock source to the USB module.
• While the FRCPLL Oscillator mode is used for
USB applications, users must always ensure that
the FRC source is configured to provide a
frequency of 4 MHz or 8 MHz (RCDIV<2:0> = 001
or 000) and that the USB PLL prescaler is
configured appropriately.
All other oscillator modes are available; however, USB
operation is not possible when these modes are
selected. They may still be useful in cases where other
power levels of operation are desirable and the USB
module is not needed (e.g., the application is sleeping
and waiting for a bus attachment).
8.6 Reference Clock Output
In addition to the CLKO output (FOSC/2) available in
certain oscillator modes, the device clock in the
PIC24FJ256GB210 family devices can also be config-
ured to provide a reference clock output signal to a port
pin. This feature is available in all oscillator configurations
and allows the user to select a greater range of clock
submultiples to drive external devices in the application.
This reference clock output is controlled by the
REFOCON register (Register 8-4). Setting the ROEN bit
(REFOCON<15>) makes the clock signal available on
the REFO pin. The RODIV bits (REFOCON<11:8>)
enable the selection of 16 different clock divider options.
The ROSSLP and ROSEL bits (REFOCON<13:12>)
control the availability of the reference output during
Sleep mode. The ROSEL bit determines if the oscillator
on OSCI and OSCO, or the current system clock
source, is used for the reference clock output. The
ROSSLP bit determines if the reference source is
available on REFO when the device is in Sleep mode.
To use the reference clock output in Sleep mode, both
the ROSSLP and ROSEL bits must be set. The device
clock must also be configured for one of the primary
modes (EC, HS or XT); otherwise, if the POSCEN bit is
not also set, the oscillator on OSCI and OSCO will be
powered down when the device enters Sleep mode.
Clearing the ROSEL bit allows the reference output
frequency to change as the system clock changes
during any clock switches.
PIC24FJ256GB210 FAMILY
DS39975A-page 148 2010 Microchip Technology Inc.
REGISTER 8-4: REFOCON: REFERENCE OSCILLATOR CONTROL REGISTER
R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ROEN — ROSSLP ROSEL(1) RODIV3 RODIV2 RODIV1 RODIV0
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 ROEN: Reference Oscillator Output Enable bit
1 = Reference oscillator is enabled on REFO pin
0 = Reference oscillator is disabled
bit 14 Unimplemented: Read as ‘0’
bit 13 ROSSLP: Reference Oscillator Output Stop in Sleep bit
1 = Reference oscillator continues to run in Sleep
0 = Reference oscillator is disabled in Sleep
bit 12 ROSEL: Reference Oscillator Source Select bit(1)
1 = Primary oscillator is used as the base clock
0 = System clock is used as the base clock; base clock reflects any clock switching of the device
bit 11-8 RODIV<3:0>: Reference Oscillator Divisor Select bits
1111 = Base clock value divided by 32,768
1110 = Base clock value divided by 16,384
1101 = Base clock value divided by 8,192
1100 = Base clock value divided by 4,096
1011 = Base clock value divided by 2,048
1010 = Base clock value divided by 1,024
1001 = Base clock value divided by 512
1000 = Base clock value divided by 256
0111 = Base clock value divided by 128
0110 = Base clock value divided by 64
0101 = Base clock value divided by 32
0100 = Base clock value divided by 16
0011 = Base clock value divided by 8
0010 = Base clock value divided by 4
0001 = Base clock value divided by 2
0000 = Base clock value
bit 7-0 Unimplemented: Read as ‘0’
Note 1: Note that the crystal oscillator must be enabled using the FOSC<2:0> bits; the crystal maintains the
operation in Sleep mode.
2010 Microchip Technology Inc. DS39975A-page 149
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9.0 POWER-SAVING FEATURES
The PIC24FJ256GB210 family of devices provides the
ability to manage power consumption by selectively
managing clocking to the CPU and the peripherals. In
general, a lower clock frequency and a reduction in the
number of circuits being clocked constitutes lower
consumed power. All PIC24F devices manage power
consumption in four different ways:
• Clock Frequency
• Instruction-Based Sleep and Idle modes
• Software Controlled Doze mode
• Selective Peripheral Control in Software
Combinations of these methods can be used to
selectively tailor an application’s power consumption,
while still maintaining critical application features, such
as timing-sensitive communications.
9.1 Clock Frequency and Clock
Switching
PIC24F devices allow for a wide range of clock
frequencies to be selected under application control. If
the system clock configuration is not locked, users can
choose low-power or high-precision oscillators by simply
changing the NOSC bits. The process of changing a
system clock during operation, as well as limitations to
the process, are discussed in more detail in Section 8.0
“Oscillator Configuration”.
9.2 Instruction-Based Power-Saving
Modes
PIC24F devices have two special power-saving modes
that are entered through the execution of a special
PWRSAV instruction. Sleep mode stops clock operation
and halts all code execution; Idle mode halts the CPU
and code execution, but allows peripheral modules to
continue operation. The assembly syntax of the
PWRSAV instruction is shown in Example 9-1.
Sleep and Idle modes can be exited as a result of an
enabled interrupt, WDT time-out or a device Reset.
When the device exits these modes, it is said to
“wake-up”.
9.2.1 SLEEP MODE
Sleep mode has these features:
• The system clock source is shut down. If an
on-chip oscillator is used, it is turned off.
• The device current consumption will be reduced
to a minimum, provided that no I/O pin is sourcing
current.
• The Fail-Safe Clock Monitor (FSCM) does not
operate during Sleep mode since the system
clock source is disabled.
• The LPRC clock will continue to run in Sleep
mode if the WDT is enabled.
• The WDT, if enabled, is automatically cleared
prior to entering Sleep mode.
• Some device features or peripherals may
continue to operate in Sleep mode. This includes
items such as the input change notification on the
I/O ports or peripherals that use an external clock
input. Any peripheral that requires the system
clock source for its operation will be disabled in
Sleep mode. Users can opt to make the voltage
regulator enter standby mode on entering Sleep
mode by clearing the VREGS bit (RCON<8>).
This will decrease current consumption but will
add a delay, TVREG, to the wake-up time. For this
reason, applications that do not use the voltage
regulator should set this bit.
The device will wake-up from Sleep mode on any of
these events:
• On any interrupt source that is individually
enabled
• On any form of device Reset
• On a WDT time-out
On wake-up from Sleep, the processor will restart with
the same clock source that was active when Sleep
mode was entered.
EXAMPLE 9-1: PWRSAV INSTRUCTION
SYNTAX
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 10. “Power-Saving Features”
(DS39698). The information in this data
sheet supersedes the information in the
FRM.
PWRSAV #0 ; Put the device into SLEEP mode
PWRSAV #1 ; Put the device into IDLE mode
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DS39975A-page 150 2010 Microchip Technology Inc.
9.2.2 IDLE MODE
Idle mode has these features:
• The CPU will stop executing instructions.
• The WDT is automatically cleared.
• The system clock source remains active. By
default, all peripheral modules continue to operate
normally from the system clock source, but can
also be selectively disabled (see Section 9.4
“Selective Peripheral Module Control”).
• If the WDT or FSCM is enabled, the LPRC will
also remain active.
The device will wake from Idle mode on any of these
events:
• Any interrupt that is individually enabled.
• Any device Reset.
• A WDT time-out.
On wake-up from Idle, the clock is reapplied to the CPU
and instruction execution begins immediately, starting
with the instruction following the PWRSAV instruction or
the first instruction in the ISR.
9.2.3 INTERRUPTS COINCIDENT WITH
POWER SAVE INSTRUCTIONS
Any interrupt that coincides with the execution of a
PWRSAV instruction will be held off until entry into Sleep
or Idle mode has completed. The device will then
wake-up from Sleep or Idle mode.
9.3 Doze Mode
Generally, changing clock speed and invoking one of
the power-saving modes are the preferred strategies
for reducing power consumption. There may be cir-
cumstances, however, where this is not practical. For
example, it may be necessary for an application to
maintain uninterrupted synchronous communication,
even while it is doing nothing else. Reducing system
clock speed may introduce communication errors,
while using a power-saving mode may stop
communications completely.
Doze mode is a simple and effective alternative method
to reduce power consumption while the device is still
executing code. In this mode, the system clock contin-
ues to operate from the same source and at the same
speed. Peripheral modules continue to be clocked at
the same speed while the CPU clock speed is reduced.
Synchronization between the two clock domains is
maintained, allowing the peripherals to access the
SFRs while the CPU executes code at a slower rate.
Doze mode is enabled by setting the DOZEN bit
(CLKDIV<11>). The ratio between peripheral and core
clock speed is determined by the DOZE<2:0> bits
(CLKDIV<14:12>). There are eight possible
configurations, from 1:1 to 1:128, with 1:1 being the
default.
It is also possible to use Doze mode to selectively
reduce power consumption in event driven applica-
tions. This allows clock-sensitive functions, such as
synchronous communications, to continue without
interruption while the CPU idles, waiting for something
to invoke an interrupt routine. Enabling the automatic
return to full-speed CPU operation on interrupts is
enabled by setting the ROI bit (CLKDIV<15>). By
default, interrupt events have no effect on Doze mode
operation.
9.4 Selective Peripheral Module
Control
Idle and Doze modes allow users to substantially
reduce power consumption by slowing or stopping the
CPU clock. Even so, peripheral modules still remain
clocked, and thus, consume power. There may be
cases where the application needs what these modes
do not provide: the allocation of power resources to
CPU processing with minimal power consumption from
the peripherals.
PIC24F devices address this requirement by allowing
peripheral modules to be selectively disabled, reducing
or eliminating their power consumption. This can be
done with two control bits:
• The Peripheral Enable bit, generically named,
“XXXEN”, located in the module’s main control
SFR.
• The Peripheral Module Disable (PMD) bit,
generically named, “XXXMD”, located in one of
the PMD Control registers.
Both bits have similar functions in enabling or disabling
its associated module. Setting the PMD bit for a module
disables all clock sources to that module, reducing its
power consumption to an absolute minimum. In this
state, the control and status registers associated with
the peripheral will also be disabled, so writes to those
registers will have no effect and read values will be
invalid. Many peripheral modules have a corresponding
PMD bit.
In contrast, disabling a module by clearing its XXXEN
bit disables its functionality, but leaves its registers
available to be read and written to. This reduces power
consumption, but not by as much as setting the PMD
bit does. Most peripheral modules have an enable bit;
exceptions include input capture, output compare and
RTCC.
To achieve more selective power savings, peripheral
modules can also be selectively disabled when the
device enters Idle mode. This is done through the
control bit of the generic name format, “XXXIDL”. By
default, all modules that can operate during Idle mode
will do so. Using the disable on Idle feature allows
further reduction of power consumption during Idle
mode, enhancing power savings for extremely critical
power applications.
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10.0 I/O PORTS
All of the device pins (except VDD, VSS, MCLR and
OSCI/CLKI) are shared between the peripherals and
the parallel I/O ports. All I/O input ports feature Schmitt
Trigger (ST) inputs for improved noise immunity.
10.1 Parallel I/O (PIO) Ports
A parallel I/O port that shares a pin with a peripheral is,
in general, subservient to the peripheral. The periph-
eral’s output buffer data and control signals are
provided to a pair of multiplexers. The multiplexers
select whether the peripheral or the associated port
has ownership of the output data and control signals of
the I/O pin. The logic also prevents “loop through”, in
which a port’s digital output can drive the input of a
peripheral that shares the same pin. Figure 10-1 shows
how ports are shared with other peripherals and the
associated I/O pin to which they are connected.
When a peripheral is enabled and it is actively driving
an associated pin, the use of the pin as a general
purpose output pin is disabled. The I/O pin may be
read, but the output driver for the parallel port bit will be
disabled. If a peripheral is enabled, but it is not actively
driving a pin, that pin may be driven by a port.
All port pins have three registers directly associated
with their operation as digital I/O and one register asso-
ciated with their operation as analog input. The Data
Direction register (TRISx) determines whether the pin
is an input or an output. If the data direction bit is a ‘1’,
then the pin is an input. All port pins are defined as
inputs after a Reset. Reads from the Output Latch reg-
ister (LATx), read the latch; writes to the latch, write the
latch. Reads from the port (PORTx), read the port pins;
writes to the port pins, write to the latch.
Any bit and its associated data and control registers
that are not valid for a particular device will be
disabled. That means the corresponding LATx and
TRISx registers, and the port pin will read as zeros.
When a pin is shared with another peripheral or func-
tion that is defined as an input only, it is regarded as a
dedicated port because there is no other competing
source of inputs.
FIGURE 10-1: BLOCK DIAGRAM OF A TYPICAL SHARED PORT STRUCTURE
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 12. “I/O Ports with Peripheral
Pin Select (PPS)” (DS39711). The infor-
mation in this data sheet supersedes the
information in the FRM.
QD
CK
WR LAT +
TRIS Latch
I/O Pin
WR PORT
Data Bus
QD
CK
Data Latch
Read PORT
Read TRIS
1
0
1
0
WR TRIS
Peripheral Output Data
Output Enable
Peripheral Input Data
I/O
Peripheral Module
Peripheral Output Enable
PIO Module
Output Multiplexers
Output Data
Input Data
Peripheral Module Enable
Read LAT
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DS39975A-page 152 2010 Microchip Technology Inc.
10.1.1 I/O PORT WRITE/READ TIMING
One instruction cycle is required between a port direction
change or port write operation and a read operation of
the same port. Typically, this instruction would be a NOP.
10.1.2 OPEN-DRAIN CONFIGURATION
In addition to the PORT, LAT and TRIS registers for data
control, each port pin can also be individually configured
for either a digital or open-drain output. This is controlled
by the Open-Drain Control register, ODCx, associated
with each port. Setting any of the bits configures the
corresponding pin to act as an open-drain output.
The open-drain feature allows the generation of
outputs higher than VDD (e.g., 5V) on any desired
digital only pins by using external pull-up resistors. The
maximum open-drain voltage allowed is the same as
the maximum VIH specification.
10.1.3 CONFIGURING D+ AND D- PINS
(RG2 AND RG3)
The input buffers of the RG2 and RG3 pins are, by
default, tri-stated. To use these pins as input pins, the
UTRDIS bit (U1CNFG2<0>) should be set, which
enables the input buffers on these pins.
10.2 Configuring Analog Port Pins
(ANSEL)
The ANSx and TRISx registers control the operation of
the pins with analog function. Each port pin with analog
function is associated with one of the ANS bits (see
Register 10-1 through Register 10-7), which decides if
the pin function should be analog or digital. Refer to
Table 10-1 for detailed behavior of the pin for different
ANSx and TRISx bit settings.
When reading the PORT register, all pins configured as
analog input channels will read as cleared (a low level).
10.2.1 ANALOG INPUT PINS AND
VOLTAGE CONSIDERATIONS
The voltage tolerance of pins used as device inputs is
dependent on the pin’s input function. Pins that are used
as digital only inputs are able to handle DC voltages of up
to 5.5V, a level typical for digital logic circuits. In contrast,
pins that also have analog input functions of any kind can
only tolerate voltages up to VDD. Voltage excursions
beyond VDD on these pins should always be avoided.
Table 10-2 summarizes the input capabilities. Refer to
Section 29.1 “DC Characteristics” for more details.
TABLE 10-1: CONFIGURING ANALOG/DIGITAL FUNCTION OF AN I/O PIN
Pin Function ANSx Setting TRISx Setting Comments
Analog Input 11It is recommended to keep ANSx = 1.
Analog Output 11It is recommended to keep ANSx = 1.
Digital Input 01Firmware must wait at least one instruction cycle
after configuring a pin as a digital input before a valid
input value can be read.
Digital Output 00Make sure to disable the analog output function on
the pin if any is present.
TABLE 10-2: INPUT VOLTAGE LEVELS FOR PORT OR PIN TOLERATED DESCRIPTION INPUT
Port or Pin Tolerated Input Description
PORTA(1)<10:9, 7:6>
VDD Only VDD input levels are tolerated.
PORTB<15:0>
PORTC(1)<15:12, 4>
PORTD<7:6>
PORTE(1)<9>
PORTF<0>
PORTG<9:6, 3:2>
PORTA(1)<15:14, 5:0>
5.5V Tolerates input levels above VDD, useful
for most standard logic.
PORTC(1)<3:1>
PORTD(1)<15:8, 5:0>
PORTE(1)<8:0>
PORTF(1)<13:12, 8:7, 5:1>
PORTG(1)<15:12, 1:0>
Note 1: Not all of the pins of these PORTS are implemented in 64-pin devices (PIC24FJXXXGB206); refer to the
device pinout diagrams for the details.
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REGISTER 10-1: ANSA: PORTA ANALOG FUNCTION SELECTION REGISTER(1)
U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-1 U-0
— — — — — ANSA10 ANSA9 —
bit 15 bit 8
R/W-1 R/W-1 U-0 U-0 U-0 U-0 U-0 U-0
ANSA7 ANSA6 — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-11 Unimplemented: Read as ‘0’
bit 10-9 ANSA<10:9>: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 8 Unimplemented: Read as ‘0’
bit 7-6 ANSA<7:6>: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 5-0 Unimplemented: Read as ‘0’
Note 1: This register is not available on 64-pin devices (PIC24FJXXXGB206).
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DS39975A-page 154 2010 Microchip Technology Inc.
REGISTER 10-2: ANSB: PORTB ANALOG FUNCTION SELECTION REGISTER
R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
ANSB15 ANSB14 ANSB13 ANSB12 ANSB11 ANSB10 ANSB9 ANSB8
bit 15 bit 8
R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
ANSB7 ANSB6 ANSB5 ANSB4 ANSB3 ANSB2 ANSB1 ANSB0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-0 ANSB<15:0>: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
REGISTER 10-3: ANSC: PORTC ANALOG FUNCTION SELECTION REGISTER
U-0 R/W-1 R/W-1 U-0 U-0 U-0 U-0 U-0
— ANSC14 ANSC13 —————
bit 15 bit 8
U-0 U-0 U-0 R/W-1 U-0 U-0 U-0 U-0
— — — ANSC4(1) — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-13 ANSC<14:13>: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 12-5 Unimplemented: Read as ‘0’
bit 4 ANSC4: Analog Function Selection bit(1)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 3-0 Unimplemented: Read as ‘0’
Note 1: This bit is not available on 64-pin devices (PIC24FJXXXGB206).
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REGISTER 10-4: ANSD: PORTD ANALOG FUNCTION SELECTION REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-1 R/W-1 U-0 U-0 U-0 U-0 U-0 U-0
ANSD7 ANSD6 — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7-6 ANSD<7:6>: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 5-0 Unimplemented: Read as ‘0’
REGISTER 10-5: ANSE: PORTE ANALOG FUNCTION SELECTION REGISTER(1)
U-0 U-0 U-0 U-0 U-0 U-0 R/W-1 U-0
— — — — — — ANSE9 —
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-10 Unimplemented: Read as ‘0’
bit 9 ANSE9: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 8-0 Unimplemented: Read as ‘0’
Note 1: This register is not available in 64-pin devices (PIC24FJXXXGB206).
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DS39975A-page 156 2010 Microchip Technology Inc.
REGISTER 10-6: ANSF: PORTF ANALOG FUNCTION SELECTION REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 R/W-1
— — — — — — —ANSF0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-1 Unimplemented: Read as ‘0’
bit 0 ANSF0: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
REGISTER 10-7: ANSG: PORTG ANALOG FUNCTION SELECTION REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-1
— — — — — — ANSG9 ANSG8
bit 15 bit 8
R/W-1 R/W-1 U-0 U-0 U-0 U-0 U-0 U-0
ANSG7 ANSG6 — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-10 Unimplemented: Read as ‘0’
bit 9-6 ANSG<9:6>: Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 5-0 Unimplemented: Read as ‘0’
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10.3 Input Change Notification
The input change notification function of the I/O ports
allows the PIC24FJ256GB210 family of devices to gen-
erate interrupt requests to the processor in response to
a Change-of-State (COS) on selected input pins. This
feature is capable of detecting input Change-of-States,
even in Sleep mode, when the clocks are disabled.
Depending on the device pin count, there are up to
84 external inputs that may be selected (enabled) for
generating an interrupt request on a Change-of-State.
Registers, CNEN1 through CNEN6, contain the inter-
rupt enable control bits for each of the CN input pins.
Setting any of these bits enables a CN interrupt for the
corresponding pins.
Each CN pin has a both a weak pull-up and a weak
pull-down connected to it. The pull-ups act as a current
source that is connected to the pin, while the
pull-downs act as a current sink that is connected to the
pin. These eliminate the need for external resistors
when push button or keypad devices are connected.
The pull-ups and pull-downs are separately enabled
using the CNPU1 through CNPU6 registers (for
pull-ups), and the CNPD1 through CNPD6 registers
(for pull-downs). Each CN pin has individual control bits
for its pull-up and pull-down. Setting a control bit
enables the weak pull-up or pull-down for the
corresponding pin.
When the internal pull-up is selected, the pin pulls up to
VDD – 1.1V (typical). When the internal pull-down is
selected, the pin pulls down to VSS.
EXAMPLE 10-1: PORT WRITE/READ IN ASSEMBLY
EXAMPLE 10-2: PORT WRITE/READ IN ‘C’
Note: Pull-ups on change notification pins
should always be disabled whenever the
port pin is configured as a digital output.
Note: To use CN83 and CN84, which are on the
D+ and D- pins, the UTRDIS bit
(U1CNFG2<0>) should be set.
MOV 0xFF00, W0 ; Con figure PORTB<1 5:8> as inputs
MOV W0, TRISB ; and PORTB<7:0> as output s
NOP ; Delay 1 cycle
BTSS PORTB, #13 ; Next Instruction
TRISB = 0xFF00; //Configure PORTB<1 5:8> as inputs and PO RTB<7:0 > as ou tputs
Nop(); //Del ay 1 cy cle
If (PORTBbits.RB13) { }; //Next Instruction
PIC24FJ256GB210 FAMILY
DS39975A-page 158 2010 Microchip Technology Inc.
10.4 Peripheral Pin Select (PPS)
A major challenge in general purpose devices is provid-
ing the largest possible set of peripheral features while
minimizing the conflict of features on I/O pins. In an
application that needs to use more than one peripheral
multiplexed on a single pin, inconvenient work arounds
in application code or a complete redesign may be the
only option.
The Peripheral Pin Select (PPS) feature provides an
alternative to these choices by enabling the user’s
peripheral set selection and its placement on a wide
range of I/O pins. By increasing the pinout options
available on a particular device, users can better tailor
the microcontroller to their entire application, rather
than trimming the application to fit the device.
The Peripheral Pin Select feature operates over a fixed
subset of digital I/O pins. Users may independently
map the input and/or output of any one of many digital
peripherals to any one of these I/O pins. PPS is per-
formed in software and generally does not require the
device to be reprogrammed. Hardware safeguards are
included that prevent accidental or spurious changes to
the peripheral mapping once it has been established.
10.4.1 AVAILABLE PINS
The PPS feature is used with a range of up to 44 pins,
depending on the particular device and its pin count.
Pins that support the Peripheral Pin Select feature
include the designation, “RPn” or “RPIn”, in their full pin
designation, where “n” is the remappable pin number.
“RP” is used to designate pins that support both remap-
pable input and output functions, while “RPI” indicates
pins that support remappable input functions only.
PIC24FJ256GB210 family devices support a larger
number of remappable input only pins than remappable
input/output pins. In this device family, there are up to
32 remappable input/output pins, depending on the pin
count of the particular device selected; these are num-
bered, RP0 through RP31. Remappable input only pins
are numbered above this range, from RPI32 to RPI43
(or the upper limit for that particular device).
See Table 1-1 for a summary of pinout options in each
package offering.
10.4.2 AVAILABLE PERIPHERALS
The peripherals managed by the PPS are all digital
only peripherals. These include general serial commu-
nications (UART and SPI), general purpose timer clock
inputs, timer related peripherals (input capture and out-
put compare) and external interrupt inputs. Also
included are the outputs of the comparator module,
since these are discrete digital signals.
PPS is not available for I2C, change notification inputs,
RTCC alarm outputs, EPMP signals or peripherals with
analog inputs.
A key difference between pin select and non pin select
peripherals is that pin select peripherals are not asso-
ciated with a default I/O pin. The peripheral must
always be assigned to a specific I/O pin before it can be
used. In contrast, non pin select peripherals are always
available on a default pin, assuming that the peripheral
is active and not conflicting with another peripheral.
10.4.2.1 Peripheral Pin Select Function
Priority
Pin-selectable peripheral outputs (e.g., OC, UART
transmit) will take priority over general purpose digital
functions on a pin, such as EPMP and port I/O. Special-
ized digital outputs, such as USB functionality, will take
priority over PPS outputs on the same pin. The pin
diagrams list peripheral outputs in the order of priority.
Refer to them for priority concerns on a particular pin.
Unlike PIC24F devices with fixed peripherals,
pin-selectable peripheral inputs will never take owner-
ship of a pin. The pin’s output buffer will be controlled
by the TRISx setting or by a fixed peripheral on the pin.
If the pin is configured in Digital mode then the PPS
input will operate correctly. If an analog function is
enabled on the pin, the PPS input will be disabled.
10.4.3 CONTROLLING PERIPHERAL PIN
SELECT
PPS features are controlled through two sets of Special
Function Registers (SFRs): one to map peripheral
inputs and one to map outputs. Because they are
separately controlled, a particular peripheral’s input
and output (if the peripheral has both) can be placed on
any selectable function pin without constraint.
The association of a peripheral to a peripheral-selectable
pin is handled in two different ways, depending on if an
input or an output is being mapped.
10.4.3.1 Input Mapping
The inputs of the Peripheral Pin Select options are
mapped on the basis of the peripheral; that is, a control
register associated with a peripheral dictates the pin it
will be mapped to. The RPINRx registers are used to
configure peripheral input mapping (see Register 10-8
through Register 10-28). Each register contains two
sets of 6-bit fields, with each set associated with one of
the pin-selectable peripherals. Programming a given
peripheral’s bit field with an appropriate 6-bit value
maps the RPn/RPIn pin with that value to that
peripheral. For any given device, the valid range of
values for any of the bit fields corresponds to the max-
imum number of Peripheral Pin Selections supported
by the device.
2010 Microchip Technology Inc. DS39975A-page 159
PIC24FJ256GB210 FAMILY
TABLE 10-3: SELECTABLE INPUT SOURCES (MAPS INPUT TO FUNCTION)(1)
Input Name Function Name Register Function Mapping
Bits
External Interrupt 1 INT1 RPINR0 INT1R<5:0>
External Interrupt 2 INT2 RPINR1 INT2R<5:0>
External Interrupt 3 INT3 RPINR1 INT3R<5:0>
External Interrupt 4 INT4 RPINR2 INT4R<5:0>
Input Capture 1 IC1 RPINR7 IC1R<5:0>
Input Capture 2 IC2 RPINR7 IC2R<5:0>
Input Capture 3 IC3 RPINR8 IC3R<5:0>
Input Capture 4 IC4 RPINR8 IC4R<5:0>
Input Capture 5 IC5 RPINR9 IC5R<5:0>
Input Capture 6 IC6 RPINR9 IC6R<5:0>
Input Capture 7 IC7 RPINR10 IC7R<5:0>
Input Capture 8 IC8 RPINR10 IC8R<5:0>
Input Capture 9 IC9 RPINR15 IC9R<5:0>
Output Compare Fault A OCFA RPINR11 OCFAR<5:0>
Output Compare Fault B OCFB RPINR11 OCFBR<5:0>
SPI1 Clock Input SCK1IN RPINR20 SCK1R<5:0>
SPI1 Data Input SDI1 RPINR20 SDI1R<5:0>
SPI1 Slave Select Input SS1IN RPINR21 SS1R<5:0>
SPI2 Clock Input SCK2IN RPINR22 SCK2R<5:0>
SPI2 Data Input SDI2 RPINR22 SDI2R<5:0>
SPI2 Slave Select Input SS2IN RPINR23 SS2R<5:0>
SPI3 Clock Input SCK3IN RPINR28 SCK3R<5:0>
SPI3 Data Input SDI3 RPINR28 SDI3R<5:0>
SPI3 Slave Select Input SS3IN RPINR29 SS3R<5:0>
Timer2 External Clock T2CK RPINR3 T2CKR<5:0>
Timer3 External Clock T3CK RPINR3 T3CKR<5:0>
Timer4 External Clock T4CK RPINR4 T4CKR<5:0>
Timer5 External Clock T5CK RPINR4 T5CKR<5:0>
UART1 Clear To Send U1CTS RPINR18 U1CTSR<5:0>
UART1 Receive U1RX RPINR18 U1RXR<5:0>
UART2 Clear To Send U2CTS RPINR19 U2CTSR<5:0>
UART2 Receive U2RX RPINR19 U2RXR<5:0>
UART3 Clear To Send U3CTS RPINR21 U3CTSR<5:0>
UART3 Receive U3RX RPINR17 U3RXR<5:0>
UART4 Clear To Send U4CTS RPINR27 U4CTSR<5:0>
UART4 Receive U4RX RPINR27 U4RXR<5:0>
Note 1: Unless otherwise noted, all inputs use the Schmitt Trigger (ST) input buffers.
PIC24FJ256GB210 FAMILY
DS39975A-page 160 2010 Microchip Technology Inc.
10.4.3.2 Output Mapping
In contrast to inputs, the outputs of the Peripheral Pin
Select options are mapped on the basis of the pin. In
this case, a control register associated with a particular
pin dictates the peripheral output to be mapped. The
RPORx registers are used to control output mapping.
Each register contains two 6-bit fields, with each field
being associated with one RPn pin (see Register 10-29
through Register 10-44). The value of the bit field
corresponds to one of the peripherals and that
peripheral’s output is mapped to the pin (see
Table 10-4).
Because of the mapping technique, the list of peripher-
als for output mapping also includes a null value of
‘000000’. This permits any given pin to remain discon-
nected from the output of any of the pin-selectable
peripherals.
TABLE 10-4: SELECTABLE OUTPUT SOURCES (MAPS FUNCTION TO OUTPUT)
Output Function Number(1) Function Output Name
0 NULL(2) Null
1 C1OUT Comparator 1 Output
2 C2OUT Comparator 2 Output
3 U1TX UART1 Transmit
4U1RTS
(3) UART1 Request To Send
5 U2TX UART2 Transmit
6U2RTS
(3) UART2 Request To Send
7 SDO1 SPI1 Data Output
8 SCK1OUT SPI1 Clock Output
9 SS1OUT SPI1 Slave Select Output
10 SDO2 SPI2 Data Output
11 SCK2OUT SPI2 Clock Output
12 SS2OUT SPI2 Slave Select Output
18 OC1 Output Compare 1
19 OC2 Output Compare 2
20 OC3 Output Compare 3
21 OC4 Output Compare 4
22 OC5 Output Compare 5
23 OC6 Output Compare 6
24 OC7 Output Compare 7
25 OC8 Output Compare 8
28 U3TX UART3 Transmit
29 U3RTS(3) UART3 Request To Send
30 U4TX UART4 Transmit
31 U4RTS(3) UART4 Request To Send
32 SDO3 SPI3 Data Output
33 SCK3OUT SPI3 Clock Output
34 SS3OUT SPI3 Slave Select Output
35 OC9 Output Compare 9
36 C3OUT Comparator 3 Output
37-63 (unused) NC
Note 1: Setting the RPORx register with the listed value assigns that output function to the associated RPn pin.
2: The NULL function is assigned to all RPn outputs at device Reset and disables the RPn output function.
3: IrDA® BCLK functionality uses this output.
2010 Microchip Technology Inc. DS39975A-page 161
PIC24FJ256GB210 FAMILY
10.4.3.3 Mapping Limitations
The control schema of the Peripheral Pin Select is
extremely flexible. Other than systematic blocks that
prevent signal contention, caused by two physical pins
being configured as the same functional input or two
functional outputs configured as the same pin, there
are no hardware enforced lockouts. The flexibility
extends to the point of allowing a single input to drive
multiple peripherals or a single functional output to
drive multiple output pins.
10.4.3.4 Mapping Exceptions for
PIC24FJ256GB210 Devices
Although the PPS registers theoretically allow for up to
64 remappable I/O pins, not all of these are imple-
mented in all devices. For PIC24FJ256GB210 family
devices, the maximum number of remappable pins
available are 44, which includes 12 input only pins. In
addition, some pins in the RP and RPI sequences are
unimplemented in lower pin count devices. The
differences in available remappable pins are
summarized in Table 10-5.
When developing applications that use remappable
pins, users should also keep these things in mind:
• For the RPINRx registers, bit combinations corre-
sponding to an unimplemented pin for a particular
device are treated as invalid. The corresponding
module will not have an input mapped to it. For all
PIC24FJ256GB210 family devices, this includes
all values greater than 43 (‘101011’).
• For RPORx registers, the bit fields corresponding
to an unimplemented pin will also be unimple-
mented. Writing to these fields will have no effect.
10.4.4 CONTROLLING CONFIGURATION
CHANGES
Because peripheral remapping can be changed during
run time, some restrictions on peripheral remapping
are needed to prevent accidental configuration
changes. PIC24F devices include three features to
prevent alterations to the peripheral map:
• Control register lock sequence
• Continuous state monitoring
• Configuration bit remapping lock
10.4.4.1 Control Register Lock
Under normal operation, writes to the RPINRx and
RPORx registers are not allowed. Attempted writes will
appear to execute normally, but the contents of the
registers will remain unchanged. To change these reg-
isters, they must be unlocked in hardware. The register
lock is controlled by the IOLOCK bit (OSCCON<6>).
Setting IOLOCK prevents writes to the control
registers; clearing IOLOCK allows writes.
To set or clear IOLOCK, a specific command sequence
must be executed:
1. Write 46h to OSCCON<7:0>.
2. Write 57h to OSCCON<7:0>.
3. Clear (or set) IOLOCK as a single operation.
Unlike the similar sequence with the oscillator’s LOCK
bit, IOLOCK remains in one state until changed. This
allows all of the Peripheral Pin Selects to be configured
with a single unlock sequence, followed by an update
to all control registers, then locked with a second lock
sequence.
10.4.4.2 Continuous State Monitoring
In addition to being protected from direct writes, the
contents of the RPINRx and RPORx registers are
constantly monitored in hardware by shadow registers.
If an unexpected change in any of the registers occurs
(such as cell disturbances caused by ESD or other
external events), a Configuration Mismatch Reset will
be triggered.
10.4.4.3 Configuration Bit Pin Select Lock
As an additional level of safety, the device can be con-
figured to prevent more than one write session to the
RPINRx and RPORx registers. The IOL1WAY
(CW2<4>) Configuration bit blocks the IOLOCK bit
from being cleared after it has been set once. If
IOLOCK remains set, the register unlock procedure will
not execute and the Peripheral Pin Select Control reg-
isters cannot be written to. The only way to clear the bit
and re-enable peripheral remapping is to perform a
device Reset.
In the default (unprogrammed) state, IOL1WAY is set,
restricting users to one write session. Programming
IOL1WAY allows users unlimited access (with the
proper use of the unlock sequence) to the Peripheral
Pin Select registers.
TABLE 10-5: REMAPPABLE PIN EXCEPTIONS FOR PIC24FJ256GB210 FAMILY DEVICES
Device Pin Count
RP Pins (I/O) RPI Pins
Total Unimplemented Total Unimplemented
64-Pin
(PIC24FJXXXGB206)
28 RP5, RP15, RP30, RP31 1 RPI32-36, RPI38-43
100/121-Pin
(PIC24FJXXXGB210)
32 — 12 —
PIC24FJ256GB210 FAMILY
DS39975A-page 162 2010 Microchip Technology Inc.
10.4.5 CONSIDERATIONS FOR
PERIPHERAL PIN SELECTION
The ability to control Peripheral Pin Selection intro-
duces several considerations into application design
that could be overlooked. This is particularly true for
several common peripherals that are available only as
remappable peripherals.
The main consideration is that the Peripheral Pin
Selects are not available on default pins in the device’s
default (Reset) state. Since all RPINRx registers reset
to ‘111111’ and all RPORx registers reset to ‘000000’,
all Peripheral Pin Select inputs are tied to VSS and all
Peripheral Pin Select outputs are disconnected.
This situation requires the user to initialize the device
with the proper peripheral configuration before any
other application code is executed. Since the IOLOCK
bit resets in the unlocked state, it is not necessary to
execute the unlock sequence after the device has
come out of Reset. For application safety, however, it is
best to set IOLOCK and lock the configuration after
writing to the control registers.
Because the unlock sequence is timing-critical, it must
be executed as an assembly language routine in the
same manner as changes to the oscillator configura-
tion. If the bulk of the application is written in ‘C’, or
another high-level language, the unlock sequence
should be performed by writing in-line assembly.
Choosing the configuration requires the review of all
Peripheral Pin Selects and their pin assignments,
especially those that will not be used in the application.
In all cases, unused pin-selectable peripherals should
be disabled completely. Unused peripherals should
have their inputs assigned to an unused RPn/RPIn pin
function. I/O pins with unused RPn functions should be
configured with the null peripheral output.
The assignment of a peripheral to a particular pin does
not automatically perform any other configuration of the
pin’s I/O circuitry. In theory, this means adding a
pin-selectable output to a pin may mean inadvertently
driving an existing peripheral input when the output is
driven. Users must be familiar with the behavior of
other fixed peripherals that share a remappable pin and
know when to enable or disable them. To be safe, fixed
digital peripherals that share the same pin should be
disabled when not in use.
Along these lines, configuring a remappable pin for a
specific peripheral does not automatically turn that
feature on. The peripheral must be specifically config-
ured for operation, and enabled as if it were tied to a fixed
pin. Where this happens in the application code (immedi-
ately following device Reset and peripheral configuration
or inside the main application routine) depends on the
peripheral and its use in the application.
A final consideration is that Peripheral Pin Select func-
tions neither override analog inputs nor reconfigure
pins with analog functions for digital I/O. If a pin is
configured as an analog input on device Reset, it must
be explicitly reconfigured as digital I/O when used with
a Peripheral Pin Select.
Example 10-3 shows a configuration for bidirectional
communication with flow control using UART1. The
following input and output functions are used:
• Input Functions: U1RX, U1CTS
• Output Functions: U1TX, U1RTS
EXAMPLE 10-3: CONFIGURING UART1
INPUT AND OUTPUT
FUNCTIONS
Note: In tying Peripheral Pin Select inputs to
RP63, RP63 need not exist on a device for
the registers to be reset to it.
// Unlock Registers
asm volatile( "MOV #OSCCON, w1 \n"
"MOV #0x46, w2 \n"
"MOV #0x57, w3 \n"
"MOV.b w2, [w1] \n"
"MOV.b w3, [w1] \n"
"BCLR OSCCON,#6");
// or use C30 built-in macro:
// _builtin_write_OSCCONL (OSCCON & 0xbf);
// Configure Input Functions (Table
Table 10-2))
// Assign U1RX To Pin RP0
RPINR18bits.U1RXR = 0;
// Assign U1CTS To Pin RP1
RPINR18bits.U1CTSR = 1;
// Configure Output Functions (Table 10-4)
// Assign U1TX To Pin RP2
RPOR1bits.RP2R = 3;
// Assign U1RTS To Pin RP3
RPOR1bits.RP3R = 4;
// Lock Registers
asm volatile ("MOV #OSCCON, w1 \n"
"MOV #0x46, w2 \n"
"MOV #0x57, w3 \n"
"MOV.b w2, [w1]\ n"
"MOV.b w3, [w1] \n"
"BSET OSCCON, #6") ;
// or use C30 built-in macro:
// _builtin_write_OSCCONL (OSCCON 0x40);
2010 Microchip Technology Inc. DS39975A-page 163
PIC24FJ256GB210 FAMILY
10.4.6 PERIPHERAL PIN SELECT
REGISTERS
The PIC24FJ256GB210 family of devices implements
a total of 37 registers for remappable peripheral
configuration:
• Input Remappable Peripheral Registers (21)
• Output Remappable Peripheral Registers (16)
Note: Input and output register values can only be
changed if IOLOCK (OSCCON<6>) = 0.
See Section 10.4.4.1 “Control Register
Lock” for a specific command sequence.
REGISTER 10-8: RPINR0: PERIPHERAL PIN SELECT INPUT REGISTER 0
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— INT1R5 INT1R4 INT1R3 INT1R2 INT1R1 INT1R0
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 INT1R<5:0>: Assign External Interrupt 1 (INT1) to the Corresponding RPn or RPIn Pin bits
bit 7-0 Unimplemented: Read as ‘0’
REGISTER 10-9: RPINR1: PERIPHERAL PIN SELECT INPUT REGISTER 1
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— INT3R5 INT3R4 INT3R3 INT3R2 INT3R1 INT3R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— INT2R5 INT2R4 INT2R3 INT2R2 INT2R1 INT2R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 INT3R<5:0>: Assign External Interrupt 3 (INT3) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 INT2R<5:0>: Assign External Interrupt 2 (INT2) to the Corresponding RPn or RPIn Pin bits
PIC24FJ256GB210 FAMILY
DS39975A-page 164 2010 Microchip Technology Inc.
REGISTER 10-10: RPINR2: PERIPHERAL PIN SELECT INPUT REGISTER 2
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— INT4R5 INT4R4 INT4R3 INT4R2 INT4R1 INT4R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-6 Unimplemented: Read as ‘0’
bit 5-0 INT4R<5:0>: Assign External Interrupt 4 (INT4) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-11: RPINR3: PERIPHERAL PIN SELECT INPUT REGISTER 3
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— T3CKR5 T3CKR4 T3CKR3 T3CKR2 T3CKR1 T3CKR0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— T2CKR5 T2CKR4 T2CKR3 T2CKR2 T2CKR1 T2CKR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 T3CKR<5:0>: Assign Timer3 External Clock (T3CK) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 T2CKR<5:0>: Assign Timer2 External Clock (T2CK) to the Corresponding RPn or RPIn Pin bits
2010 Microchip Technology Inc. DS39975A-page 165
PIC24FJ256GB210 FAMILY
REGISTER 10-12: RPINR4: PERIPHERAL PIN SELECT INPUT REGISTER 4
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— T5CKR5 T5CKR4 T5CKR3 T5CKR2 T5CKR1 T5CKR0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— T4CKR5 T4CKR4 T4CKR3 T4CKR2 T4CKR1 T4CKR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 T5CKR<5:0>: Assign Timer5 External Clock (T5CK) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 T4CKR<5:0>: Assign Timer4 External Clock (T4CK) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-13: RPINR7: PERIPHERAL PIN SELECT INPUT REGISTER 7
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC2R5 IC2R4 IC2R3 IC2R2 IC2R1 IC2R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC1R5 IC1R4 IC1R3 IC1R2 IC1R1 IC1R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 IC2R<5:0>: Assign Input Capture 2 (IC2) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 IC1R<5:0>: Assign Input Capture 1 (IC1) to the Corresponding RPn or RPIn Pin bits
PIC24FJ256GB210 FAMILY
DS39975A-page 166 2010 Microchip Technology Inc.
REGISTER 10-14: RPINR8: PERIPHERAL PIN SELECT INPUT REGISTER 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC4R5 IC4R4 IC4R3 IC4R2 IC4R1 IC4R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC3R5 IC3R4 IC3R3 IC3R2 IC3R1 IC3R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 IC4R<5:0>: Assign Input Capture 4 (IC4) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 IC3R<5:0>: Assign Input Capture 3 (IC3) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-15: RPINR9: PERIPHERAL PIN SELECT INPUT REGISTER 9
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC6R5 IC6R4 IC6R3 IC6R2 IC6R1 IC6R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC5R5 IC5R4 IC5R3 IC5R2 IC5R1 IC5R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 IC6R<5:0>: Assign Input Capture 6 (IC6) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 IC5R<5:0>: Assign Input Capture 5 (IC5) to the Corresponding RPn or RPIn Pin bits
2010 Microchip Technology Inc. DS39975A-page 167
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REGISTER 10-16: RPINR10: PERIPHERAL PIN SELECT INPUT REGISTER 10
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC8R5 IC8R4 IC8R3 IC8R2 IC8R1 IC8R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC7R5 IC7R4 IC7R3 IC7R2 IC7R1 IC7R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 IC8R<5:0>: Assign Input Capture 8 (IC8) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 IC7R<5:0>: Assign Input Capture 7 (IC7) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-17: RPINR11: PERIPHERAL PIN SELECT INPUT REGISTER 11
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— OCFBR5 OCFBR4 OCFBR3 OCFBR2 OCFBR1 OCFBR0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— OCFAR5 OCFAR4 OCFAR3 OCFAR2 OCFAR1 OCFAR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 OCFBR<5:0>: Assign Output Compare Fault B (OCFB) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 OCFAR<5:0>: Assign Output Compare Fault A (OCFA) to the Corresponding RPn or RPIn Pin bits
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DS39975A-page 168 2010 Microchip Technology Inc.
REGISTER 10-18: RPINR15: PERIPHERAL PIN SELECT INPUT REGISTER 15
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— IC9R5 IC9R4 IC9R3 IC9R2 IC9R1 IC9R0
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 IC9R<5:0>: Assign Input Capture 9 (IC9) to the Corresponding RPn or RPIn Pin bits
bit 7-0 Unimplemented: Read as ‘0’
REGISTER 10-19: RPINR17: PERIPHERAL PIN SELECT INPUT REGISTER 17
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U3RXR5 U3RXR4 U3RXR3 U3RXR2 U3RXR1 U3RXR0
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 U3RXR<5:0>: Assign UART3 Receive (U3RX) to the Corresponding RPn or RPIn Pin bits
bit 7-0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 169
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REGISTER 10-20: RPINR18: PERIPHERAL PIN SELECT INPUT REGISTER 18
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U1CTSR5 U1CTSR4 U1CTSR3 U1CTSR2 U1CTSR1 U1CTSR0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U1RXR5 U1RXR4 U1RXR3 U1RXR2 U1RXR1 U1RXR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 U1CTSR<5:0>: Assign UART1 Clear to Send (U1CTS) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 U1RXR<5:0>: Assign UART1 Receive (U1RX) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-21: RPINR19: PERIPHERAL PIN SELECT INPUT REGISTER 19
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U2CTSR5 U2CTSR4 U2CTSR3 U2CTSR2 U2CTSR1 U2CTSR0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U2RXR5 U2RXR4 U2RXR3 U2RXR2 U2RXR1 U2RXR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 U2CTSR<5:0>: Assign UART2 Clear to Send (U2CTS) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 U2RXR<5:0>: Assign UART2 Receive (U2RX) to the Corresponding RPn or RPIn Pin bits
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REGISTER 10-22: RPINR20: PERIPHERAL PIN SELECT INPUT REGISTER 20
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— SCK1R5 SCK1R4 SCK1R3 SCK1R2 SCK1R1 SCK1R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
— — SDI1R5 SDI1R4 SDI1R3 SDI1R2 SDI1R1 SDI1R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 SCK1R<5:0>: Assign SPI1 Clock Input (SCK1IN) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 SDI1R<5:0>: Assign SPI1 Data Input (SDI1) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-23: RPINR21: PERIPHERAL PIN SELECT INPUT REGISTER 21
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U3CTSR5 U3CTSR4 U3CTSR3 U3CTSR2 U3CTSR1 U3CTSR0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— SS1R5 SS1R4 SS1R3 SS1R2 SS1R1 SS1R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 U3CTSR<5:0>: Assign UART3 Clear to Send (U3CTS) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 SS1R<5:0>: Assign SPI1 Slave Select Input (SS1IN) to the Corresponding RPn or RPIn Pin bits
2010 Microchip Technology Inc. DS39975A-page 171
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REGISTER 10-24: RPINR22: PERIPHERAL PIN SELECT INPUT REGISTER 22
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— SCK2R5 SCK2R4 SCK2R3 SCK2R2 SCK2R1 SCK2R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— SDI2R5 SDI2R4 SDI2R3 SDI2R2 SDI2R1 SDI2R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 SCK2R<5:0>: Assign SPI2 Clock Input (SCK2IN) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 SDI2R<5:0>: Assign SPI2 Data Input (SDI2) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-25: RPINR23: PERIPHERAL PIN SELECT INPUT REGISTER 23
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— SS2R5 SS2R4 SS2R3 SS2R2 SS2R1 SS2R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-6 Unimplemented: Read as ‘0’
bit 5-0 SS2R<5:0>: Assign SPI2 Slave Select Input (SS2IN) to the Corresponding RPn or RPIn Pin bits
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DS39975A-page 172 2010 Microchip Technology Inc.
REGISTER 10-26: RPINR27: PERIPHERAL PIN SELECT INPUT REGISTER 27
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U4CTSR5 U4CTSR4 U4CTSR3 U4CTSR2 U4CTSR1 U4CTSR0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— U4RXR5 U4RXR4 U4RXR3 U4RXR2 U4RXR1 U4RXR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 U4CTSR<5:0>: Assign UART4 Clear to Send (U4CTS) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 U4RXR<5:0>: Assign UART4 Receive (U4RX) to the Corresponding RPn or RPIn Pin bits
REGISTER 10-27: RPINR28: PERIPHERAL PIN SELECT INPUT REGISTER 28
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— SCK3R5 SCK3R4 SCK3R3 SCK3R2 SCK3R1 SCK3R0
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
— — SDI3R5 SDI3R4 SDI3R3 SDI3R2 SDI3R1 SDI3R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 SCK3R<5:0>: Assign SPI3 Clock Input (SCK3IN) to the Corresponding RPn or RPIn Pin bits
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 SDI3R<5:0>: Assign SPI3 Data Input (SDI3) to the Corresponding RPn or RPIn Pin bits
2010 Microchip Technology Inc. DS39975A-page 173
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REGISTER 10-28: RPINR29: PERIPHERAL PIN SELECT INPUT REGISTER 29
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
—— SS3R5 SS3R4 SS3R3 SS3R2 SS3R1 SS3R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-6 Unimplemented: Read as ‘0’
bit 5-0 SS3R<5:0>: Assign SPI3 Slave Select Input (SS31IN) to the Corresponding RPn or RPIn Pin bits
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REGISTER 10-29: RPOR0: PERIPHERAL PIN SELECT OUTPUT REGISTER 0
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP1R5 RP1R4 RP1R3 RP1R2 RP1R1 RP1R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP0R5 RP0R4 RP0R3 RP0R2 RP0R1 RP0R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP1R<5:0>: RP1 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP1 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP0R<5:0>: RP0 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP0 (see Table 10-4 for peripheral function numbers).
REGISTER 10-30: RPOR1: PERIPHERAL PIN SELECT OUTPUT REGISTER 1
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP3R5 RP3R4 RP3R3 RP3R2 RP3R1 RP3R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP2R5 RP2R4 RP2R3 RP2R2 RP2R1 RP2R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP3R<5:0>: RP3 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP3 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP2R<5:0>: RP2 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP2 (see Table 10-4 for peripheral function numbers).
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REGISTER 10-31: RPOR2: PERIPHERAL PIN SELECT OUTPUT REGISTER 2
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
——RP5R5
(1) RP5R4(1) RP5R3(1) RP5R2(1) RP5R1(1) RP5R0(1)
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP4R5 RP4R4 RP4R3 RP4R2 RP4R1 RP4R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP5R<5:0>: RP5 Output Pin Mapping bits(1)
Peripheral output number n is assigned to pin, RP5 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP4R<5:0>: RP4 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP4 (see Table 10-4 for peripheral function numbers).
Note 1: Unimplemented in 64-pin devices; read as ‘0’.
REGISTER 10-32: RPOR3: PERIPHERAL PIN SELECT OUTPUT REGISTER 3
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP7R5 RP7R4 RP7R3 RP7R2 RP7R1 RP7R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP6R5 RP6R4 RP6R3 RP6R2 RP6R1 RP6R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP7R<5:0>: RP7 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP7 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP6R<5:0>: RP6 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP6 (see Table 10-4 for peripheral function numbers).
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REGISTER 10-33: RPOR4: PERIPHERAL PIN SELECT OUTPUT REGISTER 4
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP9R5 RP9R4 RP9R3 RP9R2 RP9R1 RP9R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP8R5 RP8R4 RP8R3 RP8R2 RP8R1 RP8R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP9R<5:0>: RP9 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP9 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP8R<5:0>: RP8 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP8 (see Table 10-4 for peripheral function numbers).
REGISTER 10-34: RPOR5: PERIPHERAL PIN SELECT OUTPUT REGISTER 5
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP11R5 RP11R4 RP11R3 RP11R2 RP11R1 RP11R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP10R5 RP10R4 RP10R3 RP10R2 RP10R1 RP10R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP11R<5:0>: RP11 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP11 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP10R<5:0>: RP10 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP10 (see Table 10-4 for peripheral function numbers).
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REGISTER 10-35: RPOR6: PERIPHERAL PIN SELECT OUTPUT REGISTER 6
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP13R5 RP13R4 RP13R3 RP13R2 RP13R1 RP13R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP12R5 RP12R4 RP12R3 RP12R2 RP12R1 RP12R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP13R<5:0>: RP13 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP13 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP12R<5:0>: RP12 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP12 (see Table 10-4 for peripheral function numbers).
REGISTER 10-36: RPOR7: PERIPHERAL PIN SELECT OUTPUT REGISTER 7
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
——RP15R5
(1) RP15R4(1) RP15R3(1) RP15R2(1) RP15R1(1) RP15R0(1)
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP14R5 RP14R4 RP14R3 RP14R2 RP14R1 RP14R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP15R<5:0>: RP15 Output Pin Mapping bits(1)
Peripheral output number n is assigned to pin, RP0 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP14R<5:0>: RP14 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP14 (see Table 10-4 for peripheral function numbers).
Note 1: Unimplemented in 64-pin devices; read as ‘0’.
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REGISTER 10-37: RPOR8: PERIPHERAL PIN SELECT OUTPUT REGISTER 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP17R5 RP17R4 RP17R3 RP17R2 RP17R1 RP17R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP16R5 RP16R4 RP16R3 RP16R2 RP16R1 RP16R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP17R<5:0>: RP17 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP17 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP16R<5:0>: RP16 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP16 (see Table 10-4 for peripheral function numbers).
REGISTER 10-38: RPOR9: PERIPHERAL PIN SELECT OUTPUT REGISTER 9
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP19R5 RP19R4 RP19R3 RP19R2 RP19R1 RP19R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP18R5 RP18R4 RP18R3 RP18R2 RP18R1 RP18R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP19R<5:0>: RP19 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP19 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP18R<5:0>: RP18 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP18 (see Table 10-4 for peripheral function numbers).
2010 Microchip Technology Inc. DS39975A-page 179
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REGISTER 10-39: RPOR10: PERIPHERAL PIN SELECT OUTPUT REGISTER 10
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP21R5 RP21R4 RP21R3 RP21R2 RP21R1 RP21R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP20R5 RP20R4 RP20R3 RP20R2 RP20R1 RP20R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP21R<5:0>: RP21 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP21 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP20R<5:0>: RP20 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP20 (see Table 10-4 for peripheral function numbers).
REGISTER 10-40: RPOR11: PERIPHERAL PIN SELECT OUTPUT REGISTER 11
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP23R5 RP23R4 RP23R3 RP23R2 RP23R1 RP23R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP22R5 RP22R4 RP22R3 RP22R2 RP22R1 RP22R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP23R<5:0>: RP23 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP23 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP22R<5:0>: RP22 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP22 (see Table 10-4 for peripheral function numbers).
PIC24FJ256GB210 FAMILY
DS39975A-page 180 2010 Microchip Technology Inc.
REGISTER 10-41: RPOR12: PERIPHERAL PIN SELECT OUTPUT REGISTER 12
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP25R5 RP25R4 RP25R3 RP25R2 RP25R1 RP25R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP24R5 RP24R4 RP24R3 RP24R2 RP24R1 RP24R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP25R<5:0>: RP25 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP25 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP24R<5:0>: RP24 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP24 (see Table 10-4 for peripheral function numbers).
REGISTER 10-42: RPOR13: PERIPHERAL PIN SELECT OUTPUT REGISTER 13
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP27R5 RP27R4 RP27R3 RP27R2 RP27R1 RP27R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP26R5 RP26R4 RP26R3 RP26R2 RP26R1 RP26R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP27R<5:0>: RP27 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP27 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP26R<5:0>: RP26 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP26 (see Table 10-4 for peripheral function numbers).
2010 Microchip Technology Inc. DS39975A-page 181
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REGISTER 10-43: RPOR14: PERIPHERAL PIN SELECT OUTPUT REGISTER 14
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP29R5 RP29R4 RP29R3 RP29R2 RP29R1 RP29R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP28R5 RP28R4 RP28R3 RP28R2 RP28R1 RP28R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP29R<5:0>: RP29 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP29 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP28R<5:0>: RP28 Output Pin Mapping bits
Peripheral output number n is assigned to pin, RP28 (see Table 10-4 for peripheral function numbers).
REGISTER 10-44: RPOR15: PERIPHERAL PIN SELECT OUTPUT REGISTER 15(1)
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP31R5 RP31R4 RP31R3 RP31R2 RP31R1 RP31R0
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— RP30R5 RP30R4 RP30R3 RP30R2 RP30R1 RP30R0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13-8 RP31R<5:0>: RP31 Output Pin Mapping bits(1)
Peripheral output number n is assigned to pin, RP31 (see Table 10-4 for peripheral function numbers).
bit 7-6 Unimplemented: Read as ‘0’
bit 5-0 RP30R<5:0>: RP30 Output Pin Mapping bits(1)
Peripheral output number n is assigned to pin, RP30 (see Table 10-4 for peripheral function numbers).
Note 1: Unimplemented in 64-pin devices; read as ‘0’.
PIC24FJ256GB210 FAMILY
DS39975A-page 182 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 183
PIC24FJ256GB210 FAMILY
11.0 TIMER1
The Timer1 module is a 16-bit timer, which can serve
as the time counter for the Real-Time Clock (RTC) or
operate as a free-running, interval timer/counter.
Timer1 can operate in three modes:
•16-Bit Timer
• 16-Bit Synchronous Counter
• 16-Bit Asynchronous Counter
Timer1 also supports these features:
• Timer Gate Operation
• Selectable Prescaler Settings
• Timer Operation during CPU Idle and Sleep
modes
• Interrupt on 16-Bit Period Register Match or
Falling Edge of External Gate Signal
Figure 11-1 presents a block diagram of the 16-bit timer
module.
To configure Timer1 for operation:
1. Set the TON bit (= 1).
2. Select the timer prescaler ratio using the
TCKPS<1:0> bits.
3. Set the Clock and Gating modes using the TCS
and TGATE bits.
4. Set or clear the TSYNC bit to configure
synchronous or asynchronous operation.
5. Load the timer period value into the PR1
register.
6. If interrupts are required, set the interrupt enable
bit, T1IE. Use the priority bits, T1IP<2:0>, to set
the interrupt priority.
FIGURE 11-1: 16-BIT TIMER1 MODULE BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 14. “Timers” (DS39704). The
information in this data sheet supersedes
the information in the FRM.
TON
Sync
SOSCI
SOSCO/
PR1
Set T1IF
Equal Comparator
TMR1
Reset
SOSCEN
1
0
TSYNC
Q
QD
CK
TCKPS<1:0>
Prescaler
1, 8, 64, 256
2
TGATE
TCY
1
0
T1CK
TCS
1x
01
TGATE
00
Gate
Sync
PIC24FJ256GB210 FAMILY
DS39975A-page 184 2010 Microchip Technology Inc.
REGISTER 11-1: T1CON: TIMER1 CONTROL REGISTER(1)
R/W-0 U-0 R/W-0 U-0 U-0 U-0 U-0 U-0
TON —TSIDL—————
bit 15 bit 8
U-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 U-0
— TGATE TCKPS1 TCKPS0 — TSYNC TCS —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 TON: Timer1 On bit
1 = Starts 16-bit Timer1
0 = Stops 16-bit Timer1
bit 14 Unimplemented: Read as ‘0’
bit 13 TSIDL: Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12-7 Unimplemented: Read as ‘0’
bit 6 TGATE: Timer1 Gated Time Accumulation Enable bit
When TCS = 1:
This bit is ignored.
When TCS = 0:
1 = Gated time accumulation is enabled
0 = Gated time accumulation is disabled
bit 5-4 TCKPS<1:0>: Timer1 Input Clock Prescale Select bits
11 = 1:256
10 = 1:64
01 = 1:8
00 = 1:1
bit 3 Unimplemented: Read as ‘0’
bit 2 TSYNC: Timer1 External Clock Input Synchronization Select bit
When TCS = 1:
1 = Synchronize external clock input
0 = Do not synchronize external clock input
When TCS = 0:
This bit is ignored.
bit 1 TCS: Timer1 Clock Source Select bit
1 = External clock from T1CK pin (on the rising edge)
0 = Internal clock (FOSC/2)
bit 0 Unimplemented: Read as ‘0’
Note 1: Changing the value of TxCON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
2010 Microchip Technology Inc. DS39975A-page 185
PIC24FJ256GB210 FAMILY
12.0 TIMER2/3 AND TIMER4/5
The Timer2/3 and Timer4/5 modules are 32-bit timers,
which can also be configured as four independent, 16-bit
timers with selectable operating modes.
As 32-bit timers, Timer2/3 and Timer4/5 can each
operate in three modes:
• Two independent 16-bit timers with all 16-bit
operating modes (except Asynchronous Counter
mode)
• Single 32-bit timer
• Single 32-bit synchronous counter
They also support these features:
• Timer Gate Operation
• Selectable Prescaler Settings
• Timer Operation during Idle and Sleep modes
• Interrupt on a 32-Bit Period Register Match
• ADC Event Trigger (only on Timer2/3 in 32-bit
mode and Timer3 in 16-bit mode)
Individually, all four of the 16-bit timers can function as
synchronous timers or counters. They also offer the
features listed above except for the ADC Event Trigger.
The trigger is implemented only on Timer2/3 in 32-bit
mode and Timer3 in 16-bit mode. The operating modes
and enabled features are determined by setting the
appropriate bit(s) in the T2CON, T3CON, T4CON and
T5CON registers. T2CON and T4CON are shown in
generic form in Register 12-1; T3CON and T5CON are
shown in generic form Register 12-2.
For 32-bit timer/counter operation, Timer2 and Timer4
are the least significant word; Timer3 and Timer4 are
the most significant word of the 32-bit timers.
To configure Timer2/3 or Timer4/5 for 32-bit operation:
1. Set the T32 bit (T2CON<3> or T4CON<3> = 1).
2. Select the prescaler ratio for Timer2 or Timer4
using the TCKPS<1:0> bits.
3. Set the Clock and Gating modes using the TCS
and TGATE bits. If TCS is set to an external
clock, RPINRx (TxCK) must be configured to
an available RPn/RPIn pin. For more informa-
tion, see Section 10.4 “Peripheral Pin Select
(PPS)”.
4. Load the timer period value. PR3 (or PR5) will
contain the most significant word (msw) of the
value while PR2 (or PR4) contains the least
significant word (lsw).
5. If interrupts are required, set the interrupt enable
bit, T3IE or T5IE; use the priority bits, T3IP<2:0>
or T5IP<2:0>, to set the interrupt priority. Note
that while Timer2 or Timer4 controls the timer,
the interrupt appears as a Timer3 or Timer5
interrupt.
6. Set the TON bit (= 1).
The timer value, at any point, is stored in the register
pair, TMR<3:2> (or TMR<5:4>). TMR3 (TMR5) always
contains the most significant word of the count, while
TMR2 (TMR4) contains the least significant word.
To configure any of the timers for individual 16-bit
operation:
1. Clear the T32 bit corresponding to that timer
(T2CON<3> for Timer2 and Timer3 or
T4CON<3> for Timer4 and Timer5).
2. Select the timer prescaler ratio using the
TCKPS<1:0> bits.
3. Set the Clock and Gating modes using the TCS
and TGATE bits. See Section 10.4 “Peripheral
Pin Select (PPS)” for more information.
4. Load the timer period value into the PRx register.
5. If interrupts are required, set the interrupt enable
bit, TxIE; use the priority bits, TxIP<2:0>, to set
the interrupt priority.
6. Set the TON (TxCON<15> = 1) bit.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 14. “Timers” (DS39704). The
information in this data sheet supersedes
the information in the FRM.
Note: For 32-bit operation, T3CON and T5CON
control bits are ignored. Only T2CON and
T4CON control bits are used for setup and
control. Timer2 and Timer4 clock and gate
inputs are utilized for the 32-bit timer
modules, but an interrupt is generated with
the Timer3 or Timer5 interrupt flags.
PIC24FJ256GB210 FAMILY
DS39975A-page 186 2010 Microchip Technology Inc.
FIGURE 12-1: TIMER2/3 AND TIMER4/5 (32-BIT) BLOCK DIAGRAM
TMR3 TMR2
Set T3IF (T5IF)
Equal Comparator
PR3 PR2
Reset
LSB MSB
Note 1: The 32-Bit Timer Configuration bit, T32, must be set for 32-bit timer/counter operation. All control bits are
respective to the T2CON and T4CON registers.
2: The timer clock input must be assigned to an available RPn/RPIn pin before use. See Section 10.4 “Peripheral
Pin Select (PPS)” for more information.
3: The ADC event trigger is available only on Timer 2/3 in 32-bit mode and Timer 3 in 16-bit mode.
Data Bus<15:0>
TMR3HLD
Read TMR2 (TMR4)(1)
Write TMR2 (TMR4)(1)
16
16
16
Q
QD
CK
TGATE
0
1
TON
TCKPS<1:0>
Prescaler
1, 8, 64, 256
2
TCY
TCS(2)
TGATE(2)
Gate
T2CK
Sync
ADC Event Trigger(3)
Sync
(T4CK)
(PR5) (PR4)
(TMR5HLD)
(TMR5) (TMR4)
1x
01
00
2010 Microchip Technology Inc. DS39975A-page 187
PIC24FJ256GB210 FAMILY
FIGURE 12-2: TIMER2 AND TIMER4 (16-BIT SYNCHRONOUS) BLOCK DIAGRAM
FIGURE 12-3: TIMER3 AND TIMER5 (16-BIT ASYNCHRONOUS) BLOCK DIAGRAM
TON
TCKPS<1:0>
Prescaler
1, 8, 64, 256
2
TCY TCS(1)
1x
01
TGATE(1)
00
Gate
T2CK
Sync
PR2 (PR4)
Set T2IF (T4IF)
Equal Comparator
TMR2 (TMR4)
Reset
Q
QD
CK
TGATE
1
0
(T4CK)
Sync
Note 1: The timer clock input must be assigned to an available RPn/RPIn pin before use. See Section 10.4 “Peripheral
Pin Select (PPS)” for more information.
TON
TCKPS<1:0>
2
TCY TCS(1)
1x
01
TGATE(1)
00
T3CK
PR3 (PR5)
Set T3IF (T5IF)
Equal Comparator
TMR3 (TMR5)
Reset
Q
QD
CK
TGATE
1
0
ADC Event Trigger(2)
(T5CK)
Prescaler
1, 8, 64, 256
Sync
Note 1: The timer clock input must be assigned to an available RPn/RPIn pin before use. See Section 10.4 “Peripheral
Pin Select (PPS)” for more information.
2: The ADC event trigger is available only on Timer3.
PIC24FJ256GB210 FAMILY
DS39975A-page 188 2010 Microchip Technology Inc.
REGISTER 12-1: TxCON: TIMER2 AND TIMER4 CONTROL REGISTER(3)
R/W-0 U-0 R/W-0 U-0 U-0 U-0 U-0 U-0
TON —TSIDL—————
bit 15 bit 8
U-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 U-0
— TGATE TCKPS1 TCKPS0 T32(1) —TCS
(2) —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 TON: Timerx On bit
When TxCON<3> = 1:
1 = Starts 32-bit Timerx/y
0 = Stops 32-bit Timerx/y
When TxCON<3> = 0:
1 = Starts 16-bit Timerx
0 = Stops 16-bit Timerx
bit 14 Unimplemented: Read as ‘0’
bit 13 TSIDL: Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12-7 Unimplemented: Read as ‘0’
bit 6 TGATE: Timerx Gated Time Accumulation Enable bit
When TCS = 1:
This bit is ignored.
When TCS = 0:
1 = Gated time accumulation is enabled
0 = Gated time accumulation is disabled
bit 5-4 TCKPS<1:0>: Timerx Input Clock Prescale Select bits
11 = 1:256
10 = 1:64
01 = 1:8
00 = 1:1
bit 3 T32: 32-Bit Timer Mode Select bit(1)
1 = Timerx and Timery form a single 32-bit timer
0 = Timerx and Timery act as two 16-bit timers
In 32-bit mode, T3CON control bits do not affect 32-bit timer operation.
bit 2 Unimplemented: Read as ‘0’
bit 1 TCS: Timerx Clock Source Select bit(2)
1 = External clock from pin, TxCK (on the rising edge)
0 = Internal clock (FOSC/2)
bit 0 Unimplemented: Read as ‘0’
Note 1: In T4CON, the T45 bit is implemented instead of T32 to select 32-bit mode. In 32-bit mode, the T3CON or
T5CON control bits do not affect 32-bit timer operation.
2: If TCS = 1, RPINRx (TxCK) must be configured to an available RPn/RPIn pin. For more information, see
Section 10.4 “Peripheral Pin Select (PPS)”.
3: Changing the value of TxCON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
2010 Microchip Technology Inc. DS39975A-page 189
PIC24FJ256GB210 FAMILY
REGISTER 12-2: TyCON: TIMER3 AND TIMER5 CONTROL REGISTER(3)
R/W-0 U-0 R/W-0 U-0 U-0 U-0 U-0 U-0
TON(1) —TSIDL
(1) —————
bit 15 bit 8
U-0 R/W-0 R/W-0 R/W-0 U-0 U-0 R/W-0 U-0
—TGATE
(1) TCKPS1(1) TCKPS0(1) ——TCS
(1,2) —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 TON: Timery On bit(1)
1 = Starts 16-bit Timery
0 = Stops 16-bit Timery
bit 14 Unimplemented: Read as ‘0’
bit 13 TSIDL: Stop in Idle Mode bit(1)
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12-7 Unimplemented: Read as ‘0’
bit 6 TGATE: Timery Gated Time Accumulation Enable bit(1)
When TCS = 1:
This bit is ignored.
When TCS = 0:
1 = Gated time accumulation is enabled
0 = Gated time accumulation is disabled
bit 5-4 TCKPS<1:0>: Timery Input Clock Prescale Select bits(1)
11 = 1:256
10 = 1:64
01 = 1:8
00 = 1:1
bit 3-2 Unimplemented: Read as ‘0’
bit 1 TCS: Timery Clock Source Select bit(1,2)
1 = External clock from pin, TyCK (on the rising edge)
0 = Internal clock (FOSC/2)
bit 0 Unimplemented: Read as ‘0’
Note 1: When 32-bit operation is enabled (T2CON<3> or T4CON<3> = 1), these bits have no effect on Timery
operation; all timer functions are set through T2CON and T4CON.
2: If TCS = 1, RPINRx (TxCK) must be configured to an available RPn/RPIn pin. See Section 10.4 “Peripheral
Pin Select (PPS)” for more information.
3: Changing the value of TyCON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
PIC24FJ256GB210 FAMILY
DS39975A-page 190 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 191
PIC24FJ256GB210 FAMILY
13.0 INPUT CAPTURE WITH
DEDICATED TIMERS
Devices in the PIC24FJ256GB210 family comprise
nine independent input capture modules. Each of the
modules offers a wide range of configuration and
operating options for capturing external pulse events
and generating interrupts.
Key features of the input capture module include:
• Hardware configurable for 32-bit operation in all
modes by cascading two adjacent modules
• Synchronous and Trigger modes of output
compare operation, with up to 30 user-selectable
sync/trigger sources available
• A 4-level FIFO buffer for capturing and holding
timer values for several events
• Configurable interrupt generation
• Up to 6 clock sources available for each module,
driving a separate internal 16-bit counter
The module is controlled through two registers:
ICxCON1 (Register 13-1) and ICxCON2 (Register 13-2).
A general block diagram of the module is shown in
Figure 13-1.
13.1 General Operating Modes
13.1.1 SYNCHRONOUS AND TRIGGER
MODES
When the input capture module operates in a
free-running mode, the internal 16-bit counter,
ICxTMR, counts up continuously, wrapping around
from FFFFh to 0000h on each overflow, with its period
synchronized to the selected external clock source.
When a capture event occurs, the current 16-bit value
of the internal counter is written to the FIFO buffer.
In Synchronous mode, the module begins capturing
events on the ICx pin as soon as its selected clock
source is enabled. Whenever an event occurs on the
selected sync source, the internal counter is reset. In
Trigger mode, the module waits for a Sync event from
another internal module to occur before allowing the
internal counter to run.
Standard, free-running operation is selected by setting
the SYNCSEL bits (ICxCON2<4:0>) to ‘00000’ and
clearing the ICTRIG bit (ICxCON2<7>). Synchronous
and Trigger modes are selected any time the
SYNCSEL bits are set to any value except ‘00000’.
The ICTRIG bit selects either Synchronous or Trigger
mode; setting the bit selects Trigger mode operation. In
both modes, the SYNCSEL bits determine the
sync/trigger source.
When the SYNCSEL bits are set to ‘00000’ and
ICTRIG is set, the module operates in Software Trigger
mode. In this case, capture operations are started by
manually setting the TRIGSTAT bit (ICxCON2<6>).
FIGURE 13-1: INPUT CAPTURE BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 34. “Input Capture with
Dedicated Timer” (DS39722). The infor-
mation in this data sheet supersedes the
information in the FRM.
Note 1: The ICx inputs must be assigned to an available RPn/RPIn pin before use. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
ICXBUF
4-Level FIFO Buffer
ICX Pin(1)
ICM<2:0>
Set ICXIF
Edge Detect Logic
ICI1<:0>
ICOV, ICBNE
Interrupt
Logic
System Bus
Prescaler
Counter
1:1/4/16
and
Clock Synchronizer
Event and
Clock
Select
IC Clock
Sources
Sync and
ICTSEL<2:0>
SYNCSEL<4:0>
Trigger
16
16
16
ICXTMR
Increment
Reset
Sync and
Trigger
Logic
Trigger Sources
PIC24FJ256GB210 FAMILY
DS39975A-page 192 2010 Microchip Technology Inc.
13.1.2 CASCADED (32-BIT) MODE
By default, each module operates independently with
its own 16-bit timer. To increase resolution, adjacent
even and odd modules can be configured to function as
a single 32-bit module. (For example, Modules 1 and 2
are paired, as are Modules 3 and 4, and so on.) The
odd numbered module (ICx) provides the Least Signif-
icant 16 bits of the 32-bit register pairs and the even
module (ICy) provides the Most Significant 16 bits.
Wrap-arounds of the ICx registers cause an increment
of their corresponding ICy registers.
Cascaded operation is configured in hardware by
setting the IC32 bits (ICxCON2<8>) for both modules.
13.2 Capture Operations
The input capture module can be configured to capture
timer values and generate interrupts on rising edges on
ICx or all transitions on ICx. Captures can be config-
ured to occur on all rising edges or just some (every 4th
or 16th). Interrupts can be independently configured to
generate on each event or a subset of events.
To set up the module for capture operations:
1. Configure the ICx input for one of the available
Peripheral Pin Select pins.
2. If Synchronous mode is to be used, disable the
sync source before proceeding.
3. Make sure that any previous data has been
removed from the FIFO by reading ICxBUF until
the ICBNE bit (ICxCON1<3>) is cleared.
4. Set the SYNCSEL bits (ICxCON2<4:0>) to the
desired sync/trigger source.
5. Set the ICTSEL bits (ICxCON1<12:10>) for the
desired clock source.
6. Set the ICI bits (ICxCON1<6:5>) to the desired
interrupt frequency
7. Select Synchronous or Trigger mode operation:
a) Check that the SYNCSEL bits are not set to
‘00000’.
b) For Synchronous mode, clear the ICTRIG
bit (ICxCON2<7>).
c) For Trigger mode, set ICTRIG, and clear the
TRIGSTAT bit (ICxCON2<6>).
8. Set the ICM bits (ICxCON1<2:0>) to the desired
operational mode.
9. Enable the selected sync/trigger source.
For 32-bit cascaded operations, the setup procedure is
slightly different:
1. Set the IC32 bits for both modules
(ICyCON2<8>) and (ICxCON2<8>), enabling
the even numbered module first. This ensures
the modules will start functioning in unison.
2. Set the ICTSEL and SYNCSEL bits for both
modules to select the same sync/trigger and
time base source. Set the even module first,
then the odd module. Both modules must use
the same ICTSEL and SYNCSEL settings.
3. Clear the ICTRIG bit of the even module
(ICyCON2<7>). This forces the module to run in
Synchronous mode with the odd module,
regardless of its trigger setting.
4. Use the odd module’s ICI bits (ICxCON1<6:5>)
to set the desired interrupt frequency.
5. Use the ICTRIG bit of the odd module
(ICxCON2<7>) to configure Trigger or
Synchronous mode operation.
6. Use the ICM bits of the odd module
(ICxCON1<2:0>) to set the desired capture
mode.
The module is ready to capture events when the time
base and the sync/trigger source are enabled. When
the ICBNE bit (ICxCON1<3>) becomes set, at least
one capture value is available in the FIFO. Read input
capture values from the FIFO until the ICBNE clears to
‘0’.
For 32-bit operation, read both the ICxBUF and
ICyBUF for the full 32-bit timer value (ICxBUF for the
lsw, ICyBUF for the msw). At least one capture value is
available in the FIFO buffer when the odd module’s
ICBNE bit (ICxCON1<3>) becomes set. Continue to
read the buffer registers until ICBNE is cleared
(performed automatically by hardware).
Note: For Synchronous mode operation, enable
the sync source as the last step. Both
input capture modules are held in Reset
until the sync source is enabled.
2010 Microchip Technology Inc. DS39975A-page 193
PIC24FJ256GB210 FAMILY
REGISTER 13-1: ICxCON1: INPUT CAPTURE x CONTROL REGISTER 1
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 U-0
—— ICSIDL ICTSEL2 ICTSEL1 ICTSEL0 — —
bit 15 bit 8
U-0 R/W-0 R/W-0 R-0, HSC R-0, HSC R/W-0 R/W-0 R/W-0
— ICI1 ICI0 ICOV ICBNE ICM2(1) ICM1(1) ICM0(1)
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 ICSIDL: Input Capture x Module Stop in Idle Control bit
1 = Input capture module halts in CPU Idle mode
0 = Input capture module continues to operate in CPU Idle mode
bit 12-10 ICTSEL<2:0>: Input Capture Timer Select bits
111 = System clock (FOSC/2)
110 = Reserved
101 = Reserved
100 = Timer1
011 = Timer5
010 = Timer4
001 = Timer2
000 = Timer3
bit 9-7 Unimplemented: Read as ‘0’
bit 6-5 ICI<1:0>: Select Number of Captures Per Interrupt bits
11 = Interrupt on every fourth capture event
10 = Interrupt on every third capture event
01 = Interrupt on every second capture event
00 = Interrupt on every capture event
bit 4 ICOV: Input Capture x Overflow Status Flag bit (read-only)
1 = Input capture overflow occurred
0 = No input capture overflow occurred
bit 3 ICBNE: Input Capture x Buffer Empty Status bit (read-only)
1 = Input capture buffer is not empty, at least one more capture value can be read
0 = Input capture buffer is empty
bit 2-0 ICM<2:0>: Input Capture Mode Select bits(1)
111 = Interrupt mode: input capture functions as an interrupt pin only when the device is in Sleep or
Idle mode (rising edge detect only, all other control bits are not applicable)
110 = Unused (module disabled)
101 = Prescaler Capture mode: capture on every 16th rising edge
100 = Prescaler Capture mode: capture on every 4th rising edge
011 = Simple Capture mode: capture on every rising edge
010 = Simple Capture mode: capture on every falling edge
001 = Edge Detect Capture mode: capture on every edge (rising and falling); ICI<1:0> bits do not
control interrupt generation for this mode
000 = Input capture module is turned off
Note 1: The ICx input must also be configured to an available RPn/RPIn pin. For more information, see
Section 10.4 “Peripheral Pin Select (PPS)”.
PIC24FJ256GB210 FAMILY
DS39975A-page 194 2010 Microchip Technology Inc.
REGISTER 13-2: ICxCON2: INPUT CAPTURE x CONTROL REGISTER 2
U-0 U-0 U-0 U-0 U-0 U-0 U-0 R/W-0
— — — — — — —IC32
bit 15 bit 8
R/W-0 R/W-0 HS U-0 R/W-0 R/W-1 R/W-1 R/W-0 R/W-1
ICTRIG TRIGSTAT — SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-9 Unimplemented: Read as ‘0’
bit 8 IC32: Cascade Two IC Modules Enable bit (32-bit operation)
1 = ICx and ICy operate in cascade as a 32-bit module (this bit must be set in both modules)
0 = ICx functions independently as a 16-bit module
bit 7 ICTRIG: ICx Sync/Trigger Select bit
1 = Trigger ICx from the source designated by the SYNCSELx bits
0 = Synchronize ICx with the source designated by the SYNCSELx bits
bit 6 TRIGSTAT: Timer Trigger Status bit
1 = Timer source has been triggered and is running (set in hardware, can be set in software)
0 = Timer source has not been triggered and is being held clear
bit 5 Unimplemented: Read as ‘0’
bit 4-0 SYNCSEL<4:0>: Synchronization/Trigger Source Selection bits
11111 = Reserved
11110 = Input Capture 9(2)
11101 = Input Capture 6(2)
11100 = CTMU
(1)
11011 = A/D
(1)
11010 = Comparator 3(1)
11001 = Comparator 2(1)
11000 = Comparator 1(1)
10111 = Input Capture 4(2)
10110 = Input Capture 3(2)
10101 = Input Capture 2(2)
10100 = Input Capture 1(2)
10011 = Input Capture 8(2)
10010 = Input Capture 7(2)
1000x = Reserved
01111 = Timer5
01110 = Timer4
01101 = Timer3
01100 = Timer2
01011 = Timer1
01010 = Input Capture 5(2)
01001 = Output Compare 9
.
.
.
00010 = Output Compare 2
00001 = Output Compare 1
00000 = Not synchronized to any other module
Note 1: Use these inputs as trigger sources only and never as sync sources.
2: Never use an IC module as its own trigger source by selecting this mode.
2010 Microchip Technology Inc. DS39975A-page 195
PIC24FJ256GB210 FAMILY
14.0 OUTPUT COMPARE WITH
DEDICATED TIMERS
Devices in the PIC24FJ256GB210 family feature all of
the 9 independent output compare modules. Each of
these modules offers a wide range of configuration and
operating options for generating pulse trains on internal
device events, and can produce pulse-width modulated
waveforms for driving power applications.
Key features of the output compare module include:
• Hardware configurable for 32-bit operation in all
modes by cascading two adjacent modules
• Synchronous and Trigger modes of output
compare operation, with up to 31 user-selectable
trigger/sync sources available
• Two separate period registers (a main register,
OCxR, and a secondary register, OCxRS) for
greater flexibility in generating pulses of varying
widths
• Configurable for single pulse or continuous pulse
generation on an output event, or continuous
PWM waveform generation
• Up to 6 clock sources available for each module,
driving a separate internal 16-bit counter
14.1 General Operating Modes
14.1.1 SYNCHRONOUS AND TRIGGER
MODES
When the output compare module operates in a
free-running mode, the internal 16-bit counter,
OCxTMR, runs counts up continuously, wrapping
around from 0xFFFF to 0x0000 on each overflow, with
its period synchronized to the selected external clock
source. Compare or PWM events are generated each
time a match between the internal counter and one of
the period registers occurs.
In Synchronous mode, the module begins performing
its compare or PWM operation as soon as its selected
clock source is enabled. Whenever an event occurs on
the selected sync source, the module’s internal counter
is reset. In Trigger mode, the module waits for a sync
event from another internal module to occur before
allowing the counter to run.
Free-running mode is selected by default or any time
that the SYNCSEL bits (OCxCON2<4:0>) are set to
‘00000’. Synchronous or Trigger modes are selected
any time the SYNCSEL bits are set to any value except
‘00000’. The OCTRIG bit (OCxCON2<7>) selects
either Synchronous or Trigger mode; setting the bit
selects Trigger mode operation. In both modes, the
SYNCSEL bits determine the sync/trigger source.
14.1.2 CASCADED (32-BIT) MODE
By default, each module operates independently with
its own set of 16-bit timer and duty cycle registers. To
increase resolution, adjacent even and odd modules
can be configured to function as a single 32-bit module.
(For example, Modules 1 and 2 are paired, as are
Modules 3 and 4, and so on.) The odd numbered
module (OCx) provides the Least Significant 16 bits of
the 32-bit register pairs and the even module (OCy)
provides the Most Significant 16 bits. Wrap-arounds of
the OCx registers cause an increment of their
corresponding OCy registers.
Cascaded operation is configured in hardware by set-
ting the OC32 bit (OCxCON2<8>) for both modules.
For more details on cascading, refer to the “PIC24F
Family Reference Manual”, Section 35. “Output
Compare with Dedicated Timer”.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 35. “Output Compare with
Dedicated Timer” (DS39723). The infor-
mation in this data sheet supersedes the
information in the FRM.
PIC24FJ256GB210 FAMILY
DS39975A-page 196 2010 Microchip Technology Inc.
FIGURE 14-1: OUTPUT COMPARE BLOCK DIAGRAM (16-BIT MODE)
14.2 Compare Operations
In Compare mode (Figure 14-1), the output compare
module can be configured for single-shot or continuous
pulse generation. It can also repeatedly toggle an
output pin on each timer event.
To set up the module for compare operations:
1. Configure the OCx output for one of the
available Peripheral Pin Select pins.
2. Calculate the required values for the OCxR and
(for Double Compare modes) OCxRS Duty Cycle
registers:
a) Determine the instruction clock cycle time.
Take into account the frequency of the
external clock to the timer source (if one is
used) and the timer prescaler settings.
b) Calculate time to the rising edge of the
output pulse relative to the timer start value
(0000h).
c) Calculate the time to the falling edge of the
pulse based on the desired pulse width and
the time to the rising edge of the pulse.
3. Write the rising edge value to OCxR and the
falling edge value to OCxRS.
4. Set the Timer Period register, PRy, to a value
equal to or greater than the value in OCxRS.
5. Set the OCM<2:0> bits for the appropriate
compare operation (= 0xx).
6. For Trigger mode operations, set OCTRIG to
enable Trigger mode. Set or clear TRIGMODE to
configure trigger operation and TRIGSTAT to
select a hardware or software trigger. For
Synchronous mode, clear OCTRIG.
7. Set the SYNCSEL<4:0> bits to configure the
trigger or synchronization source. If free-running
timer operation is required, set the SYNCSEL
bits to ‘00000’ (no sync/trigger source).
8. Select the time base source with the
OCTSEL<2:0> bits. If necessary, set the TON
bits for the selected timer, which enables the
compare time base to count. Synchronous
mode operation starts as soon as the time base
is enabled; Trigger mode operation starts after a
trigger source event occurs.
OCxR and
Comparator
OCxTMR
OCxCON1
OCxCON2
OC Output and
OCx Interrupt
OCx Pin(1)
OCxRS
Comparator
Fault Logic
Match Event
Match Event
Trigger and
Sync Logic
Clock
Select
Increment
Reset
OC Clock
Sources
Trigger and
Sync Sources
Reset
Match Event
OCFA/OCFB(2)
OCTSELx
SYNCSELx
TRIGSTAT
TRIGMODE
OCTRIG
OCMx
OCINV
OCTRIS
FLTOUT
FLTTRIEN
FLTMD
ENFLT<2:0>
OCFLT<2:0>
Note 1: The OCx outputs must be assigned to an available RPn pin before use. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
2: The OCFA/OCFB Fault inputs must be assigned to an available RPn/RPIn pin before use. See Section 10.4
“Peripheral Pin Select (PPS)” for more information.
DCB<1:0>
DCB<1:0>
2010 Microchip Technology Inc. DS39975A-page 197
PIC24FJ256GB210 FAMILY
For 32-bit cascaded operation, these steps are also
necessary:
1. Set the OC32 bits for both registers
(OCyCON2<8> and OCxCON2<8>). Enable the
even numbered module first to ensure the
modules will start functioning in unison.
2. Clear the OCTRIG bit of the even module
(OCyCON2) so the module will run in
Synchronous mode.
3. Configure the desired output and Fault settings
for OCy.
4. Force the output pin for OCx to the output state
by clearing the OCTRIS bit.
5. If Trigger mode operation is required, configure
the trigger options in OCx by using the OCTRIG
(OCxCON2<7>), TRIGMODE (OCxCON1<3>)
and SYNCSEL (OCxCON2<4:0>) bits.
6. Configure the desired Compare or PWM mode
of operation (OCM<2:0>) for OCy first, then for
OCx.
Depending on the output mode selected, the module
holds the OCx pin in its default state and forces a tran-
sition to the opposite state when OCxR matches the
timer. In Double Compare modes, OCx is forced back
to its default state when a match with OCxRS occurs.
The OCxIF interrupt flag is set after an OCxR match in
Single Compare modes and after each OCxRS match
in Double Compare modes.
Single-shot pulse events only occur once, but may be
repeated by simply rewriting the value of the
OCxCON1 register. Continuous pulse events continue
indefinitely until terminated.
14.3 Pulse-Width Modulation (PWM)
Mode
In PWM mode, the output compare module can be
configured for edge-aligned or center-aligned pulse
waveform generation. All PWM operations are
double-buffered (buffer registers are internal to the
module and are not mapped into SFR space).
To configure the output compare module for PWM
operation:
1. Configure the OCx output for one of the
available Peripheral Pin Select pins.
2. Calculate the desired duty cycles and load them
into the OCxR register.
3. Calculate the desired period and load it into the
OCxRS register.
4. Select the current OCx as the synchronization
source by writing 0x1F to the SYNCSEL<4:0>
bits (OCxCON2<4:0>) and ‘0’ to the OCTRIG bit
(OCxCON2<7>).
5. Select a clock source by writing to the
OCTSEL<2:0> bits (OCxCON<12:10>).
6. Enable interrupts, if required, for the timer and
output compare modules. The output compare
interrupt is required for PWM Fault pin utilization.
7. Select the desired PWM mode in the OCM<2:0>
bits (OCxCON1<2:0>).
8. Appropriate Fault inputs may be enabled by
using the ENFLT<2:0> bits as described in
Register 14-1.
9. If a timer is selected as a clock source, set the
selected timer prescale value. The selected
timer’s prescaler output is used as the clock
input for the OCx timer, and not the selected
timer output.
Note: This peripheral contains input and output
functions that may need to be configured
by the Peripheral Pin Select. See
Section 10.4 “Peripheral Pin Select
(PPS)” for more information.
PIC24FJ256GB210 FAMILY
DS39975A-page 198 2010 Microchip Technology Inc.
FIGURE 14-2: OUTPUT COMPARE BLOCK DIAGRAM (DOUBLE-BUFFERED, 16-BIT PWM MODE)
14.3.1 PWM PERIOD
The PWM period is specified by writing to PRy, the
Timer Period register. The PWM period can be
calculated using Equation 14-1.
EQUATION 14-1: CALCULATING THE PWM PERIOD(1)
OCxR and
Comparator
OCxTMR
OCxCON1
OCxCON2
OC Output and
OCx Interrupt
OCx Pin(1)
OCxRS Buffer
Comparator
Fault Logic
Match
Match
Trigger and
Sync Logic
Clock
Select
Increment
Reset
OC Clock
Sources
Trigger and
Sync Sources
Reset
Match Event
OCFA/OCFB(2)
OCTSELx
SYNCSELx
TRIGSTAT
TRIGMODE
OCTRIG
OCMx
OCINV
OCTRIS
FLTOUT
FLTTRIEN
FLTMD
ENFLT<2:0>
OCFLT<2:0>
OCxRS
Event
Event
Rollover
Rollover/Reset
Rollover/Reset
Note 1: The OCx outputs must be assigned to an available RPn pin before use. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
2: The OCFA/OCFB Fault inputs must be assigned to an available RPn/RPIn pin before use. See Section 10.4
“Peripheral Pin Select (PPS)” for more information.
OCxR and
DCB<1:0>
DCB<1:0>
DCB<1:0> Buffers
Note 1: Based on TCY = TOSC * 2; Doze mode and PLL are disabled.
PWM Period = [(PRy) + 1 • TCY • (Timer Prescale Value)
where:
PWM Frequency = 1/[PWM Period]
Note: A PRy value of N will produce a PWM period of N + 1 time base count cycles. For example, a value of 7
written into the PRy register will yield a period consisting of 8 time base cycles.
2010 Microchip Technology Inc. DS39975A-page 199
PIC24FJ256GB210 FAMILY
14.3.2 PWM DUTY CYCLE
The PWM duty cycle is specified by writing to the
OCxRS and OCxR registers. The OCxRS and OCxR
registers can be written to at any time, but the duty
cycle value is not latched until a match between PRy
and TMRy occurs (i.e., the period is complete). This
provides a double buffer for the PWM duty cycle and is
essential for glitchless PWM operation.
Some important boundary parameters of the PWM duty
cycle include:
• If OCxR, OCxRS, and PRy are all loaded with
0000h, the OCx pin will remain low (0% duty
cycle).
• If OCxRS is greater than PRy, the pin will remain
high (100% duty cycle).
See Example 14-1 for PWM mode timing details.
Table 14-1 and Table 14-2 show example PWM
frequencies and resolutions for a device operating at
4 MIPS and 10 MIPS, respectively.
EQUATION 14-2: CALCULATION FOR MAXIMUM PWM RESOLUTION(1)
EXAMPLE 14-1: PWM PERIOD AND DUTY CYCLE CALCULATIONS(1)
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
Maximum PWM Resolution (bits) =
log10
log10(2)
FPWM • (Timer Prescale Value) bits
FCY
()
1. Find the Timer Period register value for a desired PWM frequency of 52.08 kHz, where FOSC = 8 MHz with PLL
(32 MHz device clock rate) and a Timer2 prescaler setting of 1:1.
TCY = 2 * TOSC = 62.5 ns
PWM Period = 1/PWM Frequency = 1/52.08 kHz = 19.2 ms
PWM Period = (PR2 + 1) • TCY • (Timer2 Prescale Value)
19.2 ms = PR2 + 1) • 62.5 ns • 1
PR2 = 306
2. Find the maximum resolution of the duty cycle that can be used with a 52.08 kHz frequency and a 32 MHz device
clock rate:
PWM Resolution = log10(FCY/FPWM)/log
102) bits
= (log10(16 MHz/52.08 kHz)/log102) bits
= 8.3 bits
Note 1: Based on TCY = 2 * TOSC; Doze mode and PLL are disabled.
TABLE 14-1: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 4 MIPS (FCY = 4 MHz)(1)
PWM Frequency 7.6 Hz 61 Hz 122 Hz 977 Hz 3.9 kHz 31.3 kHz 125 kHz
Timer Prescaler Ratio 8111111
Period Register Value FFFFh FFFFh 7FFFh 0FFFh 03FFh 007Fh 001Fh
Resolution (bits) 16 16 15 12 10 7 5
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
TABLE 14-2: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 16 MIPS (FCY = 16 MHz)(1)
PWM Frequency 30.5 Hz 244 Hz 488 Hz 3.9 kHz 15.6 kHz 125 kHz 500 kHz
Timer Prescaler Ratio 8111111
Period Register Value FFFFh FFFFh 7FFFh 0FFFh 03FFh 007Fh 001Fh
Resolution (bits) 16 16 15 12 10 7 5
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
PIC24FJ256GB210 FAMILY
DS39975A-page 200 2010 Microchip Technology Inc.
REGISTER 14-1: OCxCON1: OUTPUT COMPARE x CONTROL REGISTER 1
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— OCSIDL OCTSEL2 OCTSEL1 OCTSEL0 ENFLT2(2) ENFLT1(2)
bit 15 bit 8
R/W-0 R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0 R/W-0 R/W-0 R/W-0
ENFLT0(2) OCFLT2(2) OCFLT1(2) OCFLT0(2) TRIGMODE OCM2(1) OCM1(1) OCM0(1)
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 Unimplemented: Read as ‘0’
bit 13 OCSIDL: Stop Output Compare x in Idle Mode Control bit
1 = Output Compare x halts in CPU Idle mode
0 = Output Compare x continues to operate in CPU Idle mode
bit 12-10 OCTSEL<2:0>: Output Compare x Timer Select bits
111 = Peripheral clock (FCY)
110 = Reserved
101 = Reserved
100 = Timer1 clock (only the synchronous clock is supported)
011 = Timer5 clock
010 = Timer4 clock
001 = Timer3 clock
000 = Timer2 clock
bit 9 ENFLT2: Fault Input 2 Enable bit(2)
1 = Fault 2 (Comparator 1/2/3 out) is enabled(3)
0 = Fault 2 is disabled
bit 8 ENFLT1: Fault Input 1 Enable bit(2)
1 = Fault 1 (OCFB pin) is enabled(4)
0 = Fault 1 is disabled
bit 7 ENFLT0: Fault Input 0 Enable bit(2)
1 = Fault 0 (OCFA pin) is enabled(4)
0 = Fault 0 is disabled
bit 6 OCFLT2: PWM Fault 2 (Comparator 1/2/3) Condition Status bit(2,3)
1 = PWM Fault 2 has occurred
0 = No PWM Fault 2 has occurred
bit 5 OCFLT1: PWM Fault 1 (OCFB pin) Condition Status bit(2,4)
1 = PWM Fault 1 has occurred
0 = No PWM Fault 1 has occurred
bit 4 OCFLT0: PWM Fault 0 (OCFA pin) Condition Status bit(2,4)
1 = PWM Fault 0 has occurred
0 = No PWM Fault 0 has occurred
Note 1: The OCx output must also be configured to an available RPn pin. For more information, see Section 10.4
“Peripheral Pin Select (PPS)”.
2: The Fault input enable and Fault status bits are valid when OCM<2:0> = 111 or 110.
3: The Comparator 1 output controls the OC1-OC3 channels; Comparator 2 output controls the OC4-OC6
channels. Comparator 3 output controls the OC7-OC9 channels.
4: The OCFA/OCFB Fault input must also be configured to an available RPn/RPIn pin. For more information,
see Section 10.4 “Peripheral Pin Select (PPS)”.
2010 Microchip Technology Inc. DS39975A-page 201
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bit 3 TRIGMODE: Trigger Status Mode Select bit
1 = TRIGSTAT (OCxCON2<6>) is cleared when OCxRS = OCxTMR or in software
0 = TRIGSTAT is only cleared by software
bit 2-0 OCM<2:0>: Output Compare x Mode Select bits(1)
111 = Center-Aligned PWM mode on OCx(2)
110 = Edge-Aligned PWM Mode on OCx(2)
101 = Double Compare Continuous Pulse mode: Initialize the OCx pin low, the toggle OCx state is
continuously on alternate matches of OCxR and OCxRS
100 = Double Compare Single-Shot mode: Initialize the OCx pin low, toggle the OCx state on matches
of OCxR and OCxRS for one cycle
011 = Single Compare Continuous Pulse mode: Compare events continuously toggle the OCx pin
010 = Single Compare Single-Shot mode: Initialize OCx pin high, compare event forces the OCx pin low
001 = Single Compare Single-Shot mode: Initialize OCx pin low, compare event forces the OCx pin high
000 = Output compare channel is disabled
REGISTER 14-1: OCxCON1: OUTPUT COMPARE x CONTROL REGISTER 1 (CONTINUED)
Note 1: The OCx output must also be configured to an available RPn pin. For more information, see Section 10.4
“Peripheral Pin Select (PPS)”.
2: The Fault input enable and Fault status bits are valid when OCM<2:0> = 111 or 110.
3: The Comparator 1 output controls the OC1-OC3 channels; Comparator 2 output controls the OC4-OC6
channels. Comparator 3 output controls the OC7-OC9 channels.
4: The OCFA/OCFB Fault input must also be configured to an available RPn/RPIn pin. For more information,
see Section 10.4 “Peripheral Pin Select (PPS)”.
PIC24FJ256GB210 FAMILY
DS39975A-page 202 2010 Microchip Technology Inc.
REGISTER 14-2: OCxCON2: OUTPUT COMPARE x CONTROL REGISTER 2
R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0
FLTMD FLTOUT FLTTRIEN OCINV —DCB1(3) DCB0(3) OC32
bit 15 bit 8
R/W-0 R/W-0 HS R/W-0 R/W-0 R/W-1 R/W-1 R/W-0 R/W-0
OCTRIG TRIGSTAT OCTRIS SYNCSEL4 SYNCSEL3 SYNCSEL2 SYNCSEL1 SYNCSEL0
bit 7 bit 0
Legend: HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 FLTMD: Fault Mode Select bit
1 = Fault mode is maintained until the Fault source is removed and the corresponding OCFLT0 bit is
cleared in software
0 = Fault mode is maintained until the Fault source is removed and a new PWM period starts
bit 14 FLTOUT: Fault Out bit
1 = PWM output is driven high on a Fault
0 = PWM output is driven low on a Fault
bit 13 FLTTRIEN: Fault Output State Select bit
1 = Pin is forced to an output on a Fault condition
0 = Pin I/O condition is unaffected by a Fault
bit 12 OCINV: OCMP Invert bit
1 = OCx output is inverted
0 = OCx output is not inverted
bit 11 Unimplemented: Read as ‘0’
bit 10-9 DCB<11:0>: PWM Duty Cycle Least Significant bits(3)
11 = Delay OCx falling edge by ¾ of the instruction cycle
10 = Delay OCx falling edge by ½ of the instruction cycle
01 = Delay OCx falling edge by ¼ of the instruction cycle
00 = OCx falling edge occurs at the start of the instruction cycle
bit 8 OC32: Cascade Two OC Modules Enable bit (32-bit operation)
1 = Cascade module operation is enabled
0 = Cascade module operation is disabled
bit 7 OCTRIG: OCx Trigger/Sync Select bit
1 = Trigger OCx from the source designated by the SYNCSELx bits
0 = Synchronize OCx with the source designated by the SYNCSELx bits
bit 6 TRIGSTAT: Timer Trigger Status bit
1 = Timer source has been triggered and is running
0 = Timer source has not been triggered and is being held clear
bit 5 OCTRIS: OCx Output Pin Direction Select bit
1 = OCx pin is tri-stated
0 = Output compare peripheral x is connected to an OCx pin
Note 1: Never use an OC module as its own trigger source, either by selecting this mode or another equivalent
SYNCSEL setting.
2: Use these inputs as trigger sources only and never as sync sources.
3: The DCB<1:0> bits are double-buffered in the PWM modes only (OCM<2:0> (OCxCON1<2:0>) = 111, 110).
2010 Microchip Technology Inc. DS39975A-page 203
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bit 4-0 SYNCSEL<4:0>: Trigger/Synchronization Source Selection bits
11111 = This OC module(1)
11110 = Input Capture 9(2)
11101 = Input Capture 6(2)
11100 = CTMU(2)
11011 = A/D(2)
11010 = Comparator 3(2)
11001 = Comparator 2(2)
11000 = Comparator 1(2)
10111 = Input Capture 4(2)
10110 = Input Capture 3(2)
10101 = Input Capture 2(2)
10100 = Input Capture 1(2)
10011 = Input Capture 8(2)
10010 = Input Capture 7(2)
1000x = Reserved
01111 = Timer5
01110 = Timer4
01101 = Timer3
01100 = Timer2
01011 = Timer1
01010 = Input Capture 5(2)
01001 = Output Compare 9(1)
01000 = Output Compare 8(1)
00111 = Output Compare 7(1)
00110 = Output Compare 6(1)
00101 = Output Compare 5(1)
00100 = Output Compare 4(1)
00011 = Output Compare 3(1)
00010 = Output Compare 2(1)
00001 = Output Compare 1(1)
00000 = Not synchronized to any other module
REGISTER 14-2: OCxCON2: OUTPUT COMPARE x CONTROL REGISTER 2 (CONTINUED)
Note 1: Never use an OC module as its own trigger source, either by selecting this mode or another equivalent
SYNCSEL setting.
2: Use these inputs as trigger sources only and never as sync sources.
3: The DCB<1:0> bits are double-buffered in the PWM modes only (OCM<2:0> (OCxCON1<2:0>) = 111, 110).
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DS39975A-page 204 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 205
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15.0 SERIAL PERIPHERAL
INTERFACE (SPI)
The Serial Peripheral Interface (SPI) module is a
synchronous serial interface useful for communicating
with other peripheral or microcontroller devices. These
peripheral devices may be serial EEPROMs, shift
registers, display drivers, A/D Converters, etc. The SPI
module is compatible with the SPI and SIOP Motorola®
interfaces. All devices of the PIC24FJ256GB210 family
include three SPI modules.
The module supports operation in two buffer modes. In
Standard mode, data is shifted through a single serial
buffer. In Enhanced Buffer mode, data is shifted
through an 8-level FIFO buffer.
The module also supports a basic framed SPI protocol
while operating in either Master or Slave mode. A total
of four framed SPI configurations are supported.
The SPI serial interface consists of four pins:
• SDIx: Serial Data Input
• SDOx: Serial Data Output
• SCKx: Shift Clock Input or Output
• SSx: Active-Low Slave Select or Frame
Synchronization I/O Pulse
The SPI module can be configured to operate using 2,
3 or 4 pins. In the 3-pin mode, SSx is not used. In the
2-pin mode, both SDOx and SSx are not used.
Block diagrams of the module in Standard and
Enhanced modes are shown in Figure 15-1 and
Figure 15-2.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 23. “Serial Peripheral Interface
(SPI)” (DS39699). The information in this
data sheet supersedes the information in
the FRM.
Note: Do not perform read-modify-write opera-
tions (such as bit-oriented instructions) on
the SPIxBUF register in either Standard or
Enhanced Buffer mode.
Note: In this section, the SPI modules are
referred to together as SPIx or separately
as SPI1, SPI2 or SPI3. Special Function
Registers will follow a similar notation. For
example, SPIxCON1 and SPIxCON2 refer
to the control registers for any of the 3 SPI
modules.
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DS39975A-page 206 2010 Microchip Technology Inc.
To set up the SPI module for the Standard Master mode
of operation:
1. If using interrupts:
a) Clear the SPIxIF bit in the respective IFS
register.
b) Set the SPIxIE bit in the respective IEC
register.
c) Write the SPIxIP bits in the respective IPC
register to set the interrupt priority.
2. Write the desired settings to the SPIxCON1
and SPIxCON2 registers with MSTEN
(SPIxCON1<5>) = 1.
3. Clear the SPIROV bit (SPIxSTAT<6>).
4. Enable SPI operation by setting the SPIEN bit
(SPIxSTAT<15>).
5. Write the data to be transmitted to the SPIxBUF
register. Transmission (and reception) will start
as soon as data is written to the SPIxBUF
register.
To set up the SPI module for the Standard Slave mode
of operation:
1. Clear the SPIxBUF register.
2. If using interrupts:
a) Clear the SPIxIF bit in the respective IFS
register.
b) Set the SPIxIE bit in the respective IEC
register.
c) Write the SPIxIP bits in the respective IPC
register to set the interrupt priority.
3. Write the desired settings to the SPIxCON1
and SPIxCON2 registers with MSTEN
(SPIxCON1<5>) = 0.
4. Clear the SMP bit.
5. If the CKE bit (SPIxCON1<8>) is set, then the
SSEN bit (SPIxCON1<7>) must be set to enable
the SSx pin.
6. Clear the SPIROV bit (SPIxSTAT<6>).
7. Enable SPI operation by setting the SPIEN bit
(SPIxSTAT<15>).
FIGURE 15-1: SPIx MODULE BLOCK DIAGRAM (STANDARD MODE)
Internal Data Bus
SDIx
SDOx
SSx/FSYNCx
SCKx
SPIxSR
bit 0
Shift Control
Edge
Select
Primary
1:1/4/16/64
Enable
Prescaler
Sync
Clock
Control
SPIxBUF
Control
Transfer
Transfer
Write SPIxBUF
Read SPIxBUF
16
SPIxCON1<1:0>
SPIxCON1<4:2>
Master Clock
Secondary
Prescaler
1:1 to 1:8
FCY
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To set up the SPI module for the Enhanced Buffer
Master mode of operation:
1. If using interrupts:
a) Clear the SPIxIF bit in the respective IFS
register.
b) Set the SPIxIE bit in the respective IEC
register.
c) Write the SPIxIP bits in the respective IPC
register.
2. Write the desired settings to the SPIxCON1
and SPIxCON2 registers with MSTEN
(SPIxCON1<5>) = 1.
3. Clear the SPIROV bit (SPIxSTAT<6>).
4. Select Enhanced Buffer mode by setting the
SPIBEN bit (SPIxCON2<0>).
5. Enable SPI operation by setting the SPIEN bit
(SPIxSTAT<15>).
6. Write the data to be transmitted to the SPIxBUF
register. Transmission (and reception) will start
as soon as data is written to the SPIxBUF
register.
To set up the SPI module for the Enhanced Buffer
Slave mode of operation:
1. Clear the SPIxBUF register.
2. If using interrupts:
a) Clear the SPIxIF bit in the respective IFS
register.
b) Set the SPIxIE bit in the respective IEC
register.
c) Write the SPIxIP bits in the respective IPC
register to set the interrupt priority.
3. Write the desired settings to the SPIxCON1
and SPIxCON2 registers with MSTEN
(SPIxCON1<5>) = 0.
4. Clear the SMP bit.
5. If the CKE bit is set, then the SSEN bit must be
set, thus enabling the SSx pin.
6. Clear the SPIROV bit (SPIxSTAT<6>).
7. Select Enhanced Buffer mode by setting the
SPIBEN bit (SPIxCON2<0>).
8. Enable SPI operation by setting the SPIEN bit
(SPIxSTAT<15>).
FIGURE 15-2: SPIx MODULE BLOCK DIAGRAM (ENHANCED MODE)
Internal Data Bus
SDIx
SDOx
SSx/FSYNCx
SCKx
SPIxSR
bit 0
Shift Control
Edge
Select
FCY
Primary
1:1/4/16/64
Enable
Prescaler
Secondary
Prescaler
1:1 to 1:8
Sync
Clock
Control
SPIXBUF
Control
Transfer
Transfer
Write SPIxBUF
Read SPIxBUF
16
SPIxCON1<1:0>
SPIxCON1<4:2>
Master Clock
8-Level FIFO
Transmit Buffer
8-Level FIFO
Receive Buffer
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REGISTER 15-1: SPIxSTAT: SPIx STATUS AND CONTROL REGISTER
R/W-0 U-0 R/W-0 U-0 U-0 R-0, HSC R-0, HSC R-0, HSC
SPIEN(1) — SPISIDL —— SPIBEC2 SPIBEC1 SPIBEC0
bit 15 bit 8
R-0, HSC R/C-0, HS R-0, HSC R/W-0 R/W-0 R/W-0 R-0, HSC R-0, HSC
SRMPT SPIROV SRXMPT SISEL2 SISEL1 SISEL0 SPITBF SPIRBF
bit 7 bit 0
Legend: C = Clearable bit HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
HSC = Hardware Settable/Clearable bit
bit 15 SPIEN: SPIx Enable bit(1)
1 = Enables the module and configures SCKx, SDOx, SDIx and SSx as serial port pins
0 = Disables themodule
bit 14 Unimplemented: Read as ‘0’
bit 13 SPISIDL: Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12-11 Unimplemented: Read as ‘0’
bit 10-8 SPIBEC<2:0>: SPIx Buffer Element Count bits (valid in Enhanced Buffer mode)
Master mode:
Number of SPI transfers pending.
Slave mode:
Number of SPI transfers unread.
bit 7 SRMPT: Shift Register (SPIxSR) Empty bit (valid in Enhanced Buffer mode)
1 = SPIx Shift register is empty and ready to send or receive
0 = SPIx Shift register is not empty
bit 6 SPIROV: Receive Overflow Flag bit
1 = A new byte/word is completely received and discarded
(The user software has not read the previous data in the SPIxBUF register.)
0 = No overflow has occurred
bit 5 SRXMPT: Receive FIFO Empty bit (valid in Enhanced Buffer mode)
1 = Receive FIFO is empty
0 = Receive FIFO is not empty
bit 4-2 SISEL<2:0>: SPIx Buffer Interrupt Mode bits (valid in Enhanced Buffer mode)
111 = Interrupt when the SPIx transmit buffer is full (SPITBF bit is set)
110 = Interrupt when the last bit is shifted into SPIxSR; as a result, the TX FIFO is empty
101 = Interrupt when the last bit is shifted out of SPIxSR; now the transmit is complete
100 = Interrupt when one data is shifted into the SPIxSR; as a result, the TX FIFO has one open spot
011 = Interrupt when the SPIx receive buffer is full (SPIRBF bit set)
010 = Interrupt when the SPIx receive buffer is 3/4 or more full
001 = Interrupt when data is available in the receive buffer (SRMPT bit is set)
000 = Interrupt when the last data in the receive buffer is read; as a result, the buffer is empty (SRXMPT
bit set)
Note 1: If SPIEN = 1, these functions must be assigned to available RPn/RPIn pins before use. See Section 10.4
“Peripheral Pin Select (PPS)” for more information.
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bit 1 SPITBF: SPIx Transmit Buffer Full Status bit
1 = Transmit has not yet started, SPIxTXB is full
0 = Transmit has started, SPIxTXB is empty
In Standard Buffer mode:
Automatically set in hardware when the CPU writes to the SPIxBUF location, loading SPIxTXB.
Automatically cleared in hardware when the SPIx module transfers data from SPIxTXB to SPIxSR.
In Enhanced Buffer mode:
Automatically set in hardware when the CPU writes to the SPIxBUF location, loading the last available
buffer location.
Automatically cleared in hardware when a buffer location is available for a CPU write.
bit 0 SPIRBF: SPIx Receive Buffer Full Status bit
1 = Receive is complete, SPIxRXB is full
0 = Receive is not complete, SPIxRXB is empty
In Standard Buffer mode:
Automatically set in hardware when SPIx transfers data from SPIxSR to SPIxRXB.
Automatically cleared in hardware when the core reads the SPIxBUF location, reading SPIxRXB.
In Enhanced Buffer mode:
Automatically set in hardware when SPIx transfers data from the SPIxSR to the buffer, filling the last
unread buffer location.
Automatically cleared in hardware when a buffer location is available for a transfer from SPIxSR.
REGISTER 15-1: SPIxSTAT: SPIx STATUS AND CONTROL REGISTER (CONTINUED)
Note 1: If SPIEN = 1, these functions must be assigned to available RPn/RPIn pins before use. See Section 10.4
“Peripheral Pin Select (PPS)” for more information.
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DS39975A-page 210 2010 Microchip Technology Inc.
REGISTER 15-2: SPIXCON1: SPIx CONTROL REGISTER 1
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — — DISSCK(1) DISSDO(2) MODE16 SMP CKE(3)
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
SSEN(4) CKP MSTEN SPRE2 SPRE1 SPRE0 PPRE1 PPRE0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13 Unimplemented: Read as ‘0’
bit 12 DISSCK: Disable SCKx Pin bit (SPI Master modes only)(1)
1 = Internal SPI clock is disabled; pin functions as I/O
0 = Internal SPI clock is enabled
bit 11 DISSDO: Disable SDOx Pin bit(2)
1 = SDOx pin is not used by the module; pin functions as I/O
0 = SDOx pin is controlled by the module
bit 10 MODE16: Word/Byte Communication Select bit
1 = Communication is word-wide (16 bits)
0 = Communication is byte-wide (8 bits)
bit 9 SMP: SPIx Data Input Sample Phase bit
Master mode:
1 = Input data is sampled at the end of data output time
0 = Input data is sampled at the middle of data output time
Slave mode:
SMP must be cleared when SPIx is used in Slave mode.
bit 8 CKE: SPIx Clock Edge Select bit(3)
1 = Serial output data changes on transition from active clock state to Idle clock state (see bit 6)
0 = Serial output data changes on transition from Idle clock state to active clock state (see bit 6)
bit 7 SSEN: Slave Select Enable (Slave mode) bit(4)
1 =SSx pin is used for Slave mode
0 =SSx
pin is not used by the module; pin is controlled by the port function
bit 6 CKP: Clock Polarity Select bit
1 = Idle state for the clock is a high level; active state is a low level
0 = Idle state for the clock is a low level; active state is a high level
bit 5 MSTEN: Master Mode Enable bit
1 = Master mode
0 =Slave mode
Note 1: If DISSCK = 0, SCKx must be configured to an available RPn pin. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
2: If DISSDO = 0, SDOx must be configured to an available RPn pin. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
3: The CKE bit is not used in the Framed SPI modes. The user should program this bit to ‘0’ for the Framed
SPI modes (FRMEN = 1).
4: If SSEN = 1, SSx must be configured to an available RPn/PRIn pin. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
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bit 4-2 SPRE<2:0>: Secondary Prescale bits (Master mode)
111 = Secondary prescale 1:1
110 = Secondary prescale 2:1
.
.
.
000 = Secondary prescale 8:1
bit 1-0 PPRE<1:0>: Primary Prescale bits (Master mode)
11 = Primary prescale 1:1
10 = Primary prescale 4:1
01 = Primary prescale 16:1
00 = Primary prescale 64:1
REGISTER 15-2: SPIXCON1: SPIx CONTROL REGISTER 1 (CONTINUED)
Note 1: If DISSCK = 0, SCKx must be configured to an available RPn pin. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
2: If DISSDO = 0, SDOx must be configured to an available RPn pin. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
3: The CKE bit is not used in the Framed SPI modes. The user should program this bit to ‘0’ for the Framed
SPI modes (FRMEN = 1).
4: If SSEN = 1, SSx must be configured to an available RPn/PRIn pin. See Section 10.4 “Peripheral Pin
Select (PPS)” for more information.
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REGISTER 15-3: SPIxCON2: SPIx CONTROL REGISTER 2
R/W-0 R/W-0 R/W-0 U-0 U-0 U-0 U-0 U-0
FRMEN SPIFSD SPIFPOL —————
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0
— — — — — — SPIFE SPIBEN
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 FRMEN: Framed SPIx Support bit
1 = Framed SPIx support is enabled
0 = Framed SPIx support is disabled
bit 14 SPIFSD: Frame Sync Pulse Direction Control on SSx Pin bit
1 = Frame sync pulse input (slave)
0 = Frame sync pulse output (master)
bit 13 SPIFPOL: Frame Sync Pulse Polarity bit (Frame mode only)
1 = Frame sync pulse is active-high
0 = Frame sync pulse is active-low
bit 12-2 Unimplemented: Read as ‘0’
bit 1 SPIFE: Frame Sync Pulse Edge Select bit
1 = Frame sync pulse coincides with the first bit clock
0 = Frame sync pulse precedes the first bit clock
bit 0 SPIBEN: Enhanced Buffer Enable bit
1 = Enhanced buffer is enabled
0 = Enhanced buffer is disabled (Legacy mode)
2010 Microchip Technology Inc. DS39975A-page 213
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FIGURE 15-3: SPI MASTER/SLAVE CONNECTION (STANDARD MODE)
FIGURE 15-4: SPI MASTER/SLAVE CONNECTION (ENHANCED BUFFER MODES)
Serial Receive Buffer
(SPIxRXB)(2)
Shift Register
(SPIxSR)(2)
LSb
MSb
SDIx
SDOx
Processor 2 (SPI Slave)
SCKx
SSx(1)
Serial Transmit Buffer
(SPIxTXB)(2)
Serial Receive Buffer
(SPIxRXB)
Shift Register
(SPIxSR)
MSb LSb
SDOx
SDIx
Processor 1 (SPI Master)
Serial Clock
SSEN (SPIxCON1<7>) = 1 and MSTEN (SPIxCON1<5>) = 0
Note 1: Using the SSx pin in Slave mode of operation is optional.
2: User must write transmit data to read received data from SPIxBUF. The SPIxTXB and SPIxRXB registers are
memory mapped to SPIxBUF.
SCKx
Serial Transmit Buffer
(SPIxTXB)
MSTEN (SPIxCON1<5>) = 1)
SPIx Buffer
(SPIxBUF)(2)
SPIx Buffer
(SPIxBUF)(2)
Shift Register
(SPIxSR)
LSb
MSb
SDIx
SDOx
Processor 2 (SPI Enhanced Buffer Slave)
SCKx
SSx(1)
Shift Register
(SPIxSR)
MSb LSb
SDOx
SDIx
Processor 1 (SPI Enhanced Buffer Master)
Serial Clock
SSEN (SPIxCON1<7>) = 1,
Note 1: Using the SSx pin in Slave mode of operation is optional.
2: User must write transmit data to read received data from SPIxBUF. The SPIxTXB and SPIxRXB registers are
memory mapped to SPIxBUF.
SSx
SCKx
8-Level FIFO Buffer
MSTEN (SPIxCON1<5>) = 1 and
SPIx Buffer
(SPIxBUF)(2)
8-Level FIFO Buffer
SPIx Buffer
(SPIxBUF)(2)
SPIBEN (SPIxCON2<0>) = 1MSTEN (SPIxCON1<5>) = 0 and
SPIBEN (SPIxCON2<0>) = 1
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DS39975A-page 214 2010 Microchip Technology Inc.
FIGURE 15-5: SPI MASTER, FRAME MASTER CONNECTION DIAGRAM
FIGURE 15-6: SPI MASTER, FRAME SLAVE CONNECTION DIAGRAM
FIGURE 15-7: SPI SLAVE, FRAME MASTER CONNECTION DIAGRAM
FIGURE 15-8: SPI SLAVE, FRAME SLAVE CONNECTION DIAGRAM
SDOx
SDIx
PIC24F
Serial Clock
SSx
SCKx
Frame Sync
Pulse
SDIx
SDOx
Processor 2
SSx
SCKx
(SPI Master, Frame Master)
SDOx
SDIx
PIC24F
Serial Clock
SSx
SCKx
Frame Sync
Pulse
SDIx
SDOx
Processor 2
SSx
SCKx
SPI Master, Frame Slave)
SDOx
SDIx
PIC24F
Serial Clock
SSx
SCKx
Frame Sync.
Pulse
SDIx
SDOx
Processor 2
SSx
SCKx
(SPI Slave, Frame Master)
SDOx
SDIx
PIC24F
Serial Clock
SSx
SCKx
Frame Sync
Pulse
SDIx
SDOx
Processor 2
SSx
SCKx
(SPI Slave, Frame Slave)
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EQUATION 15-1: RELATIONSHIP BETWEEN DEVICE AND SPI CLOCK SPEED(1)
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
FSCK = FCY
Primary Prescaler x Secondary Prescaler
TABLE 15-1: SAMPLE SCKx FREQUENCIES(1,2)
FCY = 16 MHz
Secondary Prescaler Settings
1:1 2:1 4:1 6:1 8:1
Primary Prescaler Settings
1:1 Invalid 8000 4000 2667 2000
4:1 4000 2000 1000 667 500
16:1 1000 500 250 167 125
64:1 250 125 63 42 31
FCY = 5 MHz
Primary Prescaler Settings
1:1 5000 2500 1250 833 625
4:1 1250 625 313 208 156
16:1 313 156 78 52 39
64:17839201310
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
2: SCKx frequencies shown in kHz.
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NOTES:
2010 Microchip Technology Inc. DS39975A-page 217
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16.0 INTER-INTEGRATED
CIRCUIT™ (I2C™)
The Inter-Integrated Circuit™ (I2C™) module is a serial
interface useful for communicating with other periph-
eral or microcontroller devices. These peripheral
devices may be serial EEPROMs, display drivers, A/D
Converters, etc.
The I2C module supports these features:
• Independent master and slave logic
• 7-bit and 10-bit device addresses
• General call address, as defined in the I
2
C protocol
• Clock stretching to provide delays for the
processor to respond to a slave data request
• Both 100 kHz and 400 kHz bus specifications
• Configurable address masking
• Multi-Master modes to prevent loss of messages
in arbitration
• Bus Repeater mode, allowing the acceptance of
all messages as a slave regardless of the address
• Automatic SCL
A block diagram of the module is shown in Figure 16-1.
16.1 Communicating as a Master in a
Single Master Environment
The details of sending a message in Master mode
depends on the communications protocol for the device
being communicated with. Typically, the sequence of
events is as follows:
1. Assert a Start condition on SDAx and SCLx.
2. Send the I2C device address byte to the slave
with a write indication.
3. Wait for and verify an Acknowledge from the
slave.
4. Send the first data byte (sometimes known as
the command) to the slave.
5. Wait for and verify an Acknowledge from the
slave.
6. Send the serial memory address low byte to the
slave.
7. Repeat steps 4 and 5 until all data bytes are
sent.
8. Assert a Repeated Start condition on SDAx and
SCLx.
9. Send the device address byte to the slave with
a read indication.
10. Wait for and verify an Acknowledge from the
slave.
11. Enable master reception to receive serial
memory data.
12. Generate an ACK or NACK condition at the end
of a received byte of data.
13. Generate a Stop condition on SDAx and SCLx.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 24. “Inter-Integrated Circuit™
(I2C™)” (DS39702). The information in
this data sheet supersedes the information
in the FRM.
PIC24FJ256GB210 FAMILY
DS39975A-page 218 2010 Microchip Technology Inc.
FIGURE 16-1: I2C™ BLOCK DIAGRAM
I2CxRCV
Internal
Data Bus
SCLx
SDAx
Shift
Match Detect
I2CxADD
Start and Stop
Bit Detect
Clock
Address Match
Clock
Stretching
I2CxTRN
LSB
Shift Clock
BRG Down Counter
Reload
Control
TCY/2
Start and Stop
Bit Generation
Acknowledge
Generation
Collision
Detect
I2CxCON
I2CxSTAT
Control Logic
Read
LSB
Write
Read
I2CxBRG
I2CxRSR
Write
Read
Write
Read
Write
Read
Write
Read
Write
Read
I2CxMSK
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16.2 Setting Baud Rate When
Operating as a Bus Master
To compute the Baud Rate Generator reload value, use
Equation 16-1.
EQUATION 16-1: COMPUTING BAUD RATE
RELOAD VALUE(1,2)
16.3 Slave Address Masking
The I2CxMSK register (Register 16-3) designates
address bit positions as “don’t care” for both 7-Bit and
10-Bit Addressing modes. Setting a particular bit loca-
tion (= 1) in the I2CxMSK register causes the slave
module to respond whether the corresponding address
bit value is a ‘0’ or a ‘1’. For example, when I2CxMSK
is set to ‘00100000’, the slave module will detect both
addresses, ‘0000000’ and ‘0100000’.
To enable address masking, the Intelligent Peripheral
Management Interface (IPMI) must be disabled by
clearing the IPMIEN bit (I2CxCON<11>).
TABLE 16-2: I2C™ RESERVED ADDRESSES(1)
Note 1: Based on FCY = FOSC/2; Doze mode and
PLL are disabled.
2: These clock rate values are for guidance
only. The actual clock rate can be affected
by various system level parameters. The
actual clock rate should be measured in
its intended application.
FSCL = FCY
I2CxBRG + 1 + FCY
10,000,000
I2CxBRG = FCY
10,000,000
FCY
FSCL –– 1
or:
( )
Note: As a result of changes in the I2C™ proto-
col, the addresses in Table 16-2 are
reserved and will not be Acknowledged in
Slave mode. This includes any address
mask settings that include any of these
addresses.
TABLE 16-1: I2C™ CLOCK RATES(1,2)
Required System FSCL FCY
I2CxBRG Value
Actual FSCL
(Decimal) (Hexadecimal)
100 kHz 16 MHz 157 9D 100 kHz
100 kHz 8 MHz 78 4E 100 kHz
100 kHz 4 MHz 39 27 99 kHz
400 kHz 16 MHz 37 25 404 kHz
400 kHz 8 MHz 18 12 404 kHz
400 kHz 4 MHz 9 9 385 kHz
400 kHz 2 MHz 4 4 385 kHz
1 MHz 16 MHz 13 D 1.026 MHz
1MHz 8MHz 6 6 1.026MHz
1MHz 4MHz 3 3 0.909MHz
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
2: These clock rate values are for guidance only. The actual clock rate can be affected by various system
level parameters. The actual clock rate should be measured in its intended application.
Slave Address R/W Bit Description
0000 000 0 General Call Address(2)
0000 000 1 Start Byte
0000 001 x CBus Address
0000 01x x Reserved
0000 1xx x HS Mode Master Code
1111 0xx x 10-Bit Slave Upper Byte(3)
1111 1xx x Reserved
Note 1: The address bits listed here will never cause an address match, independent of address mask settings.
2: The address will be Acknowledged only if GCEN = 1.
3: A match on this address can only occur on the upper byte in 10-Bit Addressing mode.
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REGISTER 16-1: I2CxCON: I2Cx CONTROL REGISTER
R/W-0 U-0 R/W-0 R/W-1, HC R/W-0 R/W-0 R/W-0 R/W-0
I2CEN — I2CSIDL SCLREL IPMIEN A10M DISSLW SMEN
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0, HC R/W-0, HC R/W-0, HC R/W-0, HC R/W-0, HC
GCEN STREN ACKDT ACKEN RCEN PEN RSEN SEN
bit 7 bit 0
Legend: HC = Hardware Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 I2CEN: I2Cx Enable bit
1 = Enables the I2Cx module and configures the SDAx and SCLx pins as serial port pins
0 = Disables the I2Cx module; all I2C™ pins are controlled by port functions
bit 14 Unimplemented: Read as ‘0’
bit 13 I2CSIDL: Stop in Idle Mode bit
1 = Discontinues module operation when device enters an Idle mode
0 = Continues module operation in Idle mode
bit 12 SCLREL: SCLx Release Control bit (when operating as I2C slave)
1 = Releases SCLx clock
0 = Holds SCLx clock low (clock stretch)
If STREN = 1:
Bit is R/W (i.e., software may write ‘0’ to initiate stretch and write ‘1’ to release clock). Hardware is clear
at the beginning of slave transmission. Hardware is clear at the end of slave reception.
If STREN = 0:
Bit is R/S (i.e., software may only write ‘1’ to release clock). Hardware is clear at the beginning of slave
transmission.
bit 11 IPMIEN: Intelligent Platform Management Interface (IPMI) Enable bit
1 = IPMI Support mode is enabled; all addresses are Acknowledged
0 = IPMI mode is disabled
bit 10 A10M: 10-Bit Slave Addressing bit
1 = I2CxADD is a 10-bit slave address
0 = I2CxADD is a 7-bit slave address
bit 9 DISSLW: Disable Slew Rate Control bit
1 = Slew rate control is disabled
0 = Slew rate control is enabled
bit 8 SMEN: SMBus Input Levels bit
1 = Enables I/O pin thresholds compliant with SMBus specifications
0 = Disables the SMBus input thresholds
bit 7 GCEN: General Call Enable bit (when operating as I2C slave)
1 = Enables interrupt when a general call address is received in the I2CxRSR (module is enabled for
reception)
0 = General call address disabled
bit 6 STREN: SCLx Clock Stretch Enable bit (when operating as I2C slave)
Used in conjunction with the SCLREL bit.
1 = Enables software or receive clock stretching
0 = Disables software or receive clock stretching
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bit 5 ACKDT: Acknowledge Data bit (when operating as I2C master. Applicable during master receive.)
Value that will be transmitted when the software initiates an Acknowledge sequence.
1 = Sends NACK during Acknowledge
0 = Sends ACK during Acknowledge
bit 4 ACKEN: Acknowledge Sequence Enable bit (when operating as I2C master; applicable during master
receive)
1 = Initiates Acknowledge sequence on SDAx and SCLx pins and transmits the ACKDT data bit.
Hardware is clear at the end of the master Acknowledge sequence.
0 = Acknowledge sequence is not in progress
bit 3 RCEN: Receive Enable bit (when operating as I2C master)
1 = Enables Receive mode for I2C. Hardware is clear at the end of the eighth bit of the master receive
data byte.
0 = Receive sequence is not in progress
bit 2 PEN: Stop Condition Enable bit (when operating as I2C master)
1 = Initiates Stop condition on the SDAx and SCLx pins. Hardware is clear at the end of the master
Stop sequence.
0 = Stop condition is not in progress
bit 1 RSEN: Repeated Start Condition Enabled bit (when operating as I2C master)
1 = Initiates Repeated Start condition on the SDAx and SCLx pins. Hardware is clear at the end of the
master Repeated Start sequence
0 = Repeated Start condition is not in progress
bit 0 SEN: Start Condition Enabled bit (when operating as I2C master)
1 = Initiates Start condition on SDAx and SCLx pins. Hardware is clear at end of the master Start
sequence.
0 = Start condition is not in progress
REGISTER 16-1: I2CxCON: I2Cx CONTROL REGISTER (CONTINUED)
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REGISTER 16-2: I2CxSTAT: I2Cx STATUS REGISTER
R-0, HSC R-0, HSC U-0 U-0 U-0 R/C-0, HS R-0, HSC R-0, HSC
ACKSTAT TRSTAT — — — BCL GCSTAT ADD10
bit 15 bit 8
R/C-0, HS R/C-0, HS R-0, HSC R/C-0, HSC R/C-0, HSC R-0, HSC R-0, HSC R-0, HSC
IWCOL I2COV D/A PSR/WRBF TBF
bit 7 bit 0
Legend: C = Clearable bit HS = Hardware Settable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
HSC = Hardware Settable/Clearable bit
bit 15 ACKSTAT: Acknowledge Status bit
1 = NACK was detected last
0 = ACK was detected last
Hardware is set or clear at the end of Acknowledge.
bit 14 TRSTAT: Transmit Status bit
(When operating as I2C™ master. Applicable to master transmit operation.)
1 = Master transmit is in progress (8 bits + ACK)
0 = Master transmit is not in progress
Hardware is set at the beginning of master transmission; hardware is clear at the end of slave Acknowledge.
bit 13-11 Unimplemented: Read as ‘0’
bit 10 BCL: Master Bus Collision Detect bit
1 = A bus collision has been detected during a master operation
0 = No collision
Hardware is set at the detection of a bus collision.
bit 9 GCSTAT: General Call Status bit
1 = General call address was received
0 = General call address was not received
Hardware is set when the address matches the general call address; hardware is clear at Stop detection.
bit 8 ADD10: 10-Bit Address Status bit
1 = 10-bit address was matched
0 = 10-bit address was not matched
Hardware is set at the match of the 2nd byte of the matched 10-bit address; hardware is clear at Stop detection.
bit 7 IWCOL: Write Collision Detect bit
1 = An attempt to write to the I2CxTRN register failed because the I2C module is busy
0 = No collision
Hardware is set at an occurrence of write to I2CxTRN while busy (cleared by software).
bit 6 I2COV: Receive Overflow Flag bit
1 = A byte was received while the I2CxRCV register is still holding the previous byte
0 = No overflow
Hardware is set at an attempt to transfer I2CxRSR to I2CxRCV (cleared by software).
bit 5 D/A: Data/Address bit (when operating as I2C slave)
1 = Indicates that the last byte received was data
0 = Indicates that the last byte received was a device address
Hardware is clear at the device address match. Hardware is set after a transmission finishes or by
reception of a slave byte.
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bit 4 P: Stop bit
1 = Indicates that a Stop bit has been detected last
0 = Stop bit was not detected last
Hardware is set or clear when Start, Repeated Start or Stop is detected.
bit 3 S: Start bit
1 = Indicates that a Start (or Repeated Start) bit has been detected last
0 = Start bit was not detected last
Hardware is set or clear when Start, Repeated Start or Stop is detected.
bit 2 R/W: Read/Write Information bit (when operating as I2C slave)
1 = Read – indicates data transfer is output from the slave
0 = Write – indicates data transfer is input to the slave
Hardware is set or clear after the reception of an I2C device address byte.
bit 1 RBF: Receive Buffer Full Status bit
1 = Receive is complete, I2CxRCV is full
0 = Receive not complete, I2CxRCV is empty
Hardware is set when I2CxRCV is written with the received byte; hardware is clear when the software
reads I2CxRCV.
bit 0 TBF: Transmit Buffer Full Status bit
1 = Transmit is in progress, I2CxTRN is full
0 = Transmit is complete, I2CxTRN is empty
Hardware is set when software writes to I2CxTRN; hardware is clear at the completion of data transmission.
REGISTER 16-2: I2CxSTAT: I2Cx STATUS REGISTER (CONTINUED)
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REGISTER 16-3: I2CxMSK: I2Cx SLAVE MODE ADDRESS MASK REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0
— — — — — — AMSK9 AMSK8
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
AMSK7 AMSK6 AMSK5 AMSK4 AMSK3 AMSK2 AMSK1 AMSK0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-10 Unimplemented: Read as ‘0’
bit 9-0 AMSK<9:0>: Mask for Address Bit x Select bits
1 = Enable masking for bit x of the incoming message address; bit match is not required in this position
0 = Disable masking for bit x; bit match is required in this position
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17.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules available
in the PIC24F device family. The UART is a full-duplex,
asynchronous system that can communicate with
peripheral devices, such as personal computers,
LIN/J2602, RS-232 and RS-485 interfaces. The module
also supports a hardware flow control option with the
UxCTS and UxRTS pins, and also includes an IrDA®
encoder and decoder.
The primary features of the UART module are:
• Full-Duplex, 8 or 9-Bit Data Transmission through
the UxTX and UxRX Pins
• Even, Odd or No Parity Options (for 8-bit data)
• One or Two Stop bits
• Hardware Flow Control Option with the UxCTS
and UxRTS Pins
• Fully Integrated Baud Rate Generator with 16-Bit
Prescaler
• Baud Rates Ranging from 15 bps to 1 Mbps at
16 MIPS
• 4-Deep, First-In-First-Out (FIFO) Transmit Data
Buffer
• 4-Deep FIFO Receive Data Buffer
• Parity, Framing and Buffer Overrun Error Detection
• Support for 9-bit mode with Address Detect
(9th bit = 1)
• Transmit and Receive Interrupts
• Loopback mode for Diagnostic Support
• Support for Sync and Break Characters
• Supports Automatic Baud Rate Detection
•IrDA
® Encoder and Decoder Logic
• 16x Baud Clock Output for IrDA Support
A simplified block diagram of the UART is shown in
Figure 17-1. The UART module consists of these key
important hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver
FIGURE 17-1: UART SIMPLIFIED BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 21. “UART” (DS39708). The
information in this data sheet supersedes
the information in the FRM.
UxRX
IrDA®
Hardware Flow Control
UARTx Receiver
UARTx Transmitter UxTX
UxCTS
UxRTS/BCLKx
Baud Rate Generator
Note: The UART inputs and outputs must all be assigned to available RPn/RPIn pins before use. See Section 10.4
“Peripheral Pin Select (PPS)” for more information.
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17.1 UART Baud Rate Generator (BRG)
The UART module includes a dedicated, 16-bit Baud
Rate Generator. The UxBRG register controls the
period of a free-running, 16-bit timer. Equation 17-1
shows the formula for computation of the baud rate with
BRGH = 0.
EQUATION 17-1: UART BAUD RATE WITH
BRGH = 0(1,2)
Example 17-1 shows the calculation of the baud rate
error for the following conditions:
•FCY = 4 MHz
• Desired Baud Rate = 9600
The maximum baud rate (BRGH = 0) possible is
FCY/16 (for UxBRG = 0) and the minimum baud rate
possible is FCY/(16 * 65536).
Equation 17-2 shows the formula for computation of
the baud rate with BRGH = 1.
EQUATION 17-2: UART BAUD RATE WITH
BRGH = 1(1,2)
The maximum baud rate (BRGH = 1) possible is FCY/4
(for UxBRG = 0) and the minimum baud rate possible
is FCY/(4 * 65536).
Writing a new value to the UxBRG register causes the
BRG timer to be reset (cleared). This ensures the BRG
does not wait for a timer overflow before generating the
new baud rate.
EXAMPLE 17-1: BAUD RATE ERROR CALCULATION (BRGH = 0)(1)
Note 1: FCY denotes the instruction cycle clock
frequency (FOSC/2).
2: Based on FCY = FOSC/2; Doze mode
and PLL are disabled.
Baud Rate = FCY
16 • (UxBRG + 1)
UxBRG = FCY
16 • Baud Rate – 1
Note 1: FCY denotes the instruction cycle clock
frequency.
2: Based on FCY = FOSC/2; Doze mode
and PLL are disabled.
Baud Rate = FCY
4 • (UxBRG + 1)
UxBRG = FCY
4 • Baud Rate – 1
Note: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
Desired Baud Rate = FCY/(16 (BRGx + 1))
Solving for BRGx Value:
BRGx = ((FCY/Desired Baud Rate)/16) – 1
BRGx = ((4000000/9600)/16) – 1
BRGx = 25
Calculated Baud Rate = 4000000/(16 (25 + 1))
= 9615
Error = (Calculated Baud Rate – Desired Baud Rate)
Desired Baud Rate
= (9615 – 9600)/9600
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17.2 Transmitting in 8-Bit Data Mode
1. Set up the UART:
a) Write appropriate values for data, parity and
Stop bits.
b) Write appropriate baud rate value to the
UxBRG register.
c) Set up transmit and receive interrupt enable
and priority bits.
2. Enable the UART.
3. Set the UTXEN bit (causes a transmit interrupt
two cycles after being set).
4. Write a data byte to the lower byte of UxTXREG
word. The value will be immediately transferred
to the Transmit Shift Register (TSR) and the
serial bit stream will start shifting out with the
next rising edge of the baud clock.
5. Alternately, the data byte may be transferred
while UTXEN = 0 and then the user may set
UTXEN. This will cause the serial bit stream to
begin immediately because the baud clock will
start from a cleared state.
6. A transmit interrupt will be generated as per
interrupt control bit, UTXISELx.
17.3 Transmitting in 9-Bit Data Mode
1. Set up the UART (as described in Section 17.2
“Transmitting in 8-Bit Data Mode”).
2. Enable the UART.
3. Set the UTXEN bit (causes a transmit interrupt).
4. Write UxTXREG as a 16-bit value only.
5. A word write to UxTXREG triggers the transfer
of the 9-bit data to the TSR. The serial bit stream
will start shifting out with the first rising edge of
the baud clock.
6. A transmit interrupt will be generated as per the
setting of control bit, UTXISELx.
17.4 Break and Sync Transmit
Sequence
The following sequence will send a message frame
header, made up of a Break, followed by an auto-baud
sync byte.
1. Configure the UART for the desired mode.
2. Set UTXEN and UTXBRK to set up the Break
character.
3. Load the UxTXREG with a dummy character to
initiate transmission (value is ignored).
4. Write ‘55h’ to UxTXREG; this loads the Sync
character into the transmit FIFO.
5. After the Break has been sent, the UTXBRK bit
is reset by hardware. The Sync character now
transmits.
17.5 Receiving in 8-Bit or 9-Bit Data
Mode
1. Set up the UART (as described in Section 17.2
“Transmitting in 8-Bit Data Mode”).
2. Enable the UART.
3. A receive interrupt will be generated when one
or more data characters have been received as
per interrupt control bit, URXISELx.
4. Read the OERR bit to determine if an overrun
error has occurred. The OERR bit must be reset
in software.
5. Read UxRXREG.
The act of reading the UxRXREG character will move
the next character to the top of the receive FIFO,
including a new set of PERR and FERR values.
17.6 Operation of UxCTS and UxRTS
Control Pins
UARTx Clear to Send (UxCTS) and Request to Send
(UxRTS) are the two hardware controlled pins that are
associated with the UART module. These two pins
allow the UART to operate in Simplex and Flow Control
mode. They are implemented to control the transmis-
sion and reception between the Data Terminal
Equipment (DTE). The UEN<1:0> bits in the UxMODE
register configure these pins.
17.7 Infrared Support
The UART module provides two types of infrared UART
support: one is the IrDA clock output to support an
external IrDA encoder and decoder device (legacy
module support), and the other is the full implementa-
tion of the IrDA encoder and decoder. Note that
because the IrDA modes require a 16x baud clock, they
will only work when the BRGH bit (UxMODE<3>) is ‘0’.
17.7.1 IrDA CLOCK OUTPUT FOR
EXTERNAL IrDA SUPPORT
To support external IrDA encoder and decoder devices,
the BCLKx pin (same as the UxRTS pin) can be
configured to generate the 16x baud clock. With
UEN<1:0> = 11, the BCLKx pin will output the 16x
baud clock if the UART module is enabled. It can be
used to support the IrDA codec chip.
17.7.2 BUILT-IN IrDA ENCODER AND
DECODER
The UART has full implementation of the IrDA encoder
and decoder as part of the UART module. The built-in
IrDA encoder and decoder functionality is enabled
using the IREN bit (UxMODE<12>). When enabled
(IREN = 1), the receive pin (UxRX) acts as the input
from the infrared receiver. The transmit pin (UxTX) acts
as the output to the infrared transmitter.
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REGISTER 17-1: UxMODE: UARTx MODE REGISTER
R/W-0 U-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0
UARTEN(1) — USIDL IREN(2) RTSMD — UEN1 UEN0
bit 15 bit 8
R/W-0, HC R/W-0 R/W-0, HC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
WAKE LPBACK ABAUD RXINV BRGH PDSEL1 PDSEL0 STSEL
bit 7 bit 0
Legend: HC = Hardware Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 UARTEN: UARTx Enable bit(1)
1 = UARTx is enabled; all UARTx pins are controlled by UARTx as defined by UEN<1:0>
0 = UARTx is disabled; all UARTx pins are controlled by port latches; UARTx power consumption is minimal
bit 14 Unimplemented: Read as ‘0’
bit 13 USIDL: Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12 IREN: IrDA® Encoder and Decoder Enable bit(2)
1 = IrDA encoder and decoder are enabled
0 = IrDA encoder and decoder are disabled
bit 11 RTSMD: Mode Selection for UxRTS Pin bit
1 =UxRTS pin is in Simplex mode
0 =UxRTS
pin is in Flow Control mode
bit 10 Unimplemented: Read as ‘0’
bit 9-8 UEN<1:0>: UARTx Enable bits
11 = UxTX, UxRX and BCLKx pins are enabled and used; UxCTS pin is controlled by port latches
10 = UxTX, UxRX, UxCTS and UxRTS pins are enabled and used
01 = UxTX, UxRX and UxRTS pins are enabled and used; UxCTS pin is controlled by port latches
00 = UxTX and UxRX pins are enabled and used; UxCTS and UxRTS/BCLKx pins are controlled by port
latches
bit 7 WAKE: Wake-up on Start Bit Detect During Sleep Mode Enable bit
1 = UARTx will continue to sample the UxRX pin; interrupt is generated on the falling edge, bit is cleared
in hardware on the following rising edge
0 = No wake-up is enabled
bit 6 LPBACK: UARTx Loopback Mode Select bit
1 = Enable Loopback mode
0 = Loopback mode is disabled
bit 5 ABAUD: Auto-Baud Enable bit
1 = Enable baud rate measurement on the next character – requires reception of a sync field (55h);
cleared in hardware upon completion
0 = Baud rate measurement is disabled or completed
Note 1: If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. See
Section 10.4 “Peripheral Pin Select (PPS)” for more information.
2: This feature is only available for the 16x BRG mode (BRGH = 0).
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bit 4 RXINV: Receive Polarity Inversion bit
1 = UxRX Idle state is ‘0’
0 = UxRX Idle state is ‘1’
bit 3 BRGH: High Baud Rate Enable bit
1 = High-Speed mode (4 BRG clock cycles per bit)
0 = Standard-Speed mode (16 BRG clock cycles per bit)
bit 2-1 PDSEL<1:0>: Parity and Data Selection bits
11 = 9-bit data, no parity
10 = 8-bit data, odd parity
01 = 8-bit data, even parity
00 = 8-bit data, no parity
bit 0 STSEL: Stop Bit Selection bit
1 = Two Stop bits
0 = One Stop bit
REGISTER 17-1: UxMODE: UARTx MODE REGISTER (CONTINUED)
Note 1: If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. See
Section 10.4 “Peripheral Pin Select (PPS)” for more information.
2: This feature is only available for the 16x BRG mode (BRGH = 0).
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REGISTER 17-2: UxSTA: UARTx STATUS AND CONTROL REGISTER
R/W-0 R/W-0 R/W-0 U-0 R/W-0 HC R/W-0 R-0, HSC R-1, HSC
UTXISEL1 UTXINV(1) UTXISEL0 — UTXBRK UTXEN(2) UTXBF TRMT
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R-1, HSC R-0, HSC R-0, HSC R/C-0, HS R-0, HSC
URXISEL1 URXISEL0 ADDEN RIDLE PERR FERR OERR URXDA
bit 7 bit 0
Legend: C = Clearable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
HS = Hardware Settable bit HC = Hardware Clearable bit
bit 15,13 UTXISEL<1:0>: Transmission Interrupt Mode Selection bits
11 = Reserved; do not use
10 = Interrupt when a character is transferred to the Transmit Shift Register (TSR), and as a result,
the transmit buffer becomes empty
01 = Interrupt when the last character is shifted out of the Transmit Shift Register; all transmit
operations are completed
00 = Interrupt when a character is transferred to the Transmit Shift Register (this implies there is at
least one character open in the transmit buffer)
bit 14 UTXINV: IrDA® Encoder Transmit Polarity Inversion bit(1)
IREN = 0:
1 = UxTX is Idle ‘0’
0 = UxTX is Idle ‘1’
IREN = 1:
1 = UxTX is Idle ‘1’
0 = UxTX is Idle ‘0’
bit 12 Unimplemented: Read as ‘0’
bit 11 UTXBRK: Transmit Break bit
1 = Send Sync Break on next transmission – Start bit, followed by twelve ‘0’ bits, followed by Stop bit;
cleared by hardware upon completion
0 = Sync Break transmission is disabled or completed
bit 10 UTXEN: Transmit Enable bit(2)
1 = Transmit is enabled, UxTX pin controlled by UARTx
0 = Transmit is disabled, any pending transmission is aborted and the buffer is reset; UxTX pin is
controlled by port.
bit 9 UTXBF: Transmit Buffer Full Status bit (read-only)
1 = Transmit buffer is full
0 = Transmit buffer is not full, at least one more character can be written
bit 8 TRMT: Transmit Shift Register Empty bit (read-only)
1 = Transmit Shift Register is empty and the transmit buffer is empty (the last transmission has
completed)
0 = Transmit Shift Register is not empty, a transmission is in progress or queued
Note 1: Value of bit only affects the transmit properties of the module when the IrDA® encoder is enabled
(IREN = 1).
2: If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. See
Section 10.4 “Peripheral Pin Select (PPS)” for more information.
2010 Microchip Technology Inc. DS39975A-page 231
PIC24FJ256GB210 FAMILY
bit 7-6 URXISEL<1:0>: Receive Interrupt Mode Selection bits
11 = Interrupt is set on an RSR transfer, making the receive buffer full (i.e., has 4 data characters)
10 = Interrupt is set on an RSR transfer, making the receive buffer 3/4 full (i.e., has 3 data characters)
0x = Interrupt is set when any character is received and transferred from the RSR to the receive buffer;
receive buffer has one or more characters
bit 5 ADDEN: Address Character Detect bit (bit 8 of received data = 1)
1 = Address Detect mode is enabled
If 9-bit mode is not selected, this does not take effect.
0 = Address Detect mode is disabled
bit 4 RIDLE: Receiver Idle bit (read-only)
1 = Receiver is Idle
0 = Receiver is active
bit 3 PERR: Parity Error Status bit (read-only)
1 = Parity error has been detected for the current character (character at the top of the receive FIFO)
0 = Parity error has not been detected
bit 2 FERR: Framing Error Status bit (read-only)
1 = Framing error has been detected for the current character (character at the top of the receive FIFO)
0 = Framing error has not been detected
bit 1 OERR: Receive Buffer Overrun Error Status bit (clear/read-only)
1 = Receive buffer has overflowed
0 = Receive buffer has not overflowed (clearing a previously set OERR bit (10 transition); will reset
the receiver buffer and the RSR to the empty state
bit 0 URXDA: Receive Buffer Data Available bit (read-only)
1 = Receive buffer has data, at least one more character can be read
0 = Receive buffer is empty
REGISTER 17-2: UxSTA: UARTx STATUS AND CONTROL REGISTER (CONTINUED)
Note 1: Value of bit only affects the transmit properties of the module when the IrDA® encoder is enabled
(IREN = 1).
2: If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. See
Section 10.4 “Peripheral Pin Select (PPS)” for more information.
PIC24FJ256GB210 FAMILY
DS39975A-page 232 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 233
PIC24FJ256GB210 FAMILY
18.0 UNIVERSAL SERIAL BUS WITH
ON-THE-GO SUPPORT (USB
OTG)
PIC24FJ256GB210 family devices contain a full-speed
and low-speed compatible, On-The-Go (OTG) USB
Serial Interface Engine (SIE). The OTG capability
allows the device to act either as a USB peripheral
device or as a USB embedded host with limited host
capabilities. The OTG capability allows the device to
dynamically switch from device to host operation using
OTG’s Host Negotiation Protocol (HNP).
For more details on OTG operation, refer to the
“On-The-Go Supplement” to the “USB 2.0 Specifica-
tion”, published by the USB-IF. For more details on
USB operation, refer to the “Universal Serial Bus
Specification”, v2.0.
The USB OTG module offers these features:
• USB functionality in Device and Host modes, and
OTG capabilities for application-controlled mode
switching
• Software-selectable module speeds of full speed
(12 Mbps) or low speed (1.5 Mbps, available in
Host mode only)
• Support for all four USB transfer types: control,
interrupt, bulk and isochronous
• 16 bidirectional endpoints for a total of 32 unique
endpoints
• DMA interface for data RAM access
• Queues up to sixteen unique endpoint transfers
without servicing
• Integrated, on-chip USB transceiver with support
for off-chip transceivers via a digital interface
• Integrated VBUS generation with on-chip
comparators and boost generation, and support of
external VBUS comparators and regulators
through a digital interface
• Configurations for on-chip bus pull-up and
pull-down resistors
A simplified block diagram of the USB OTG module is
shown in Figure 18-1.
The USB OTG module can function as a USB peripheral
device or as a USB host, and may dynamically switch
between Device and Host modes under software
control. In either mode, the same data paths and Buffer
Descriptors (BDs) are used for the transmission and
reception of data.
In discussing USB operation, this section will use a
controller-centric nomenclature for describing the direc-
tion of the data transfer between the microcontroller and
the USB. RX (Receive) will be used to describe transfers
that move data from the USB to the microcontroller and
TX (Transmit) will be used to describe transfers that
move data from the microcontroller to the USB.
Table 18-1 shows the relationship between data
direction in this nomenclature and the USB tokens
exchanged.
TABLE 18-1: CONTROLLER-CENTRIC
DATA DIRECTION FOR USB
HOST OR TARGET
This chapter presents the most basic operations
needed to implement USB OTG functionality in an
application. A complete and detailed discussion of the
USB protocol and its OTG supplement are beyond the
scope of this data sheet. It is assumed that the user
already has a basic understanding of USB architecture
and the latest version of the protocol.
Not all steps for proper USB operation (such as device
enumeration) are presented here. It is recommended
that application developers use an appropriate device
driver to implement all of the necessary features.
Microchip provides a number of application-specific
resources, such as USB firmware and driver support.
Refer to www.microchip.com/usb for the latest
firmware and driver support.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 27. “USB On-The-Go (OTG)”
(DS39721). The information in this data
sheet supersedes the information in the
FRM.
USB Mode
Direction
RX TX
Device OUT or SETUP IN
Host IN OUT or SETUP
PIC24FJ256GB210 FAMILY
DS39975A-page 234 2010 Microchip Technology Inc.
FIGURE 18-1: USB OTG MODULE BLOCK DIAGRAM
48 MHz USB Clock
D+(1)
D-(1)
USBID(1)
VBUS(1)
Transceiver
VBUSON(1)
Comparators
USB
SRP Charge
SRP Discharge
Registers
and
Control
Interface
Voltage
System
RAM
Full-Speed Pull-up
Host Pull-Down
Host Pull-Down
Note 1: Pins are multiplexed with digital I/O and other device features.
VMIO(1)
VPIO(1)
DMH(1)
DPH(1)
DMLN(1)
DPLN(1)
RCV(1)
VBUS
Boost
Assist
External Transceiver Interface
USBOEN(1)
VCMPST1/VBUSVLD(1)
VCMPST2/SESSVLD(1)
VBUSST(1)
VCPCON(1)
SIE
USB
SESSEND(1)
Transceiver Power 3.3V
VUSB
2010 Microchip Technology Inc. DS39975A-page 235
PIC24FJ256GB210 FAMILY
18.1 Hardware Configuration
18.1.1 DEVICE MODE
18.1.1.1 D+ Pull-up Resistor
PIC24FJ256GB210 family devices have a built-in
1.5 k resistor on the D+ line that is available when the
microcontroller is operating in Device mode. This is
used to signal an external Host that the device is
operating in Full-Speed Device mode. It is engaged by
setting the USBEN bit (U1CON<0>). If the OTGEN bit
(U1OTGCON<2>) is set, then the D+ pull-up is enabled
through the DPPULUP bit (U1OTGCON<7>).
Alternatively, an external resistor may be used on D+,
as shown in Figure 18-2.
FIGURE 18-2: EXTERNAL PULL-UP FOR
FULL-SPEED DEVICE
MODE
18.1.1.2 Power Modes
Many USB applications will likely have several different
sets of power requirements and configuration. The
most common power modes encountered are:
•Bus Power Only mode
• Self-Power Only mode
• Dual Power with Self-Power Dominance
Bus Power Only mode (Figure 18-3) is effectively the
simplest method. All power for the application is drawn
from the USB.
To meet the inrush current requirements of the
“USB 2.0 OTG Specification”, the total effective capac-
itance appearing across VBUS and ground must be no
more than 10 F.
In the USB Suspend mode, devices must consume no
more than 2.5 mA from the 5V VBUS line of the USB
cable. During the USB Suspend mode, the D+ or D-
pull-up resistor must remain active, which will consume
some of the allowed suspend current.
In Self-Power Only mode (Figure 18-4), the USB
application provides its own power, with very little
power being pulled from the USB. Note that an attach
indication is added to indicate when the USB has been
connected and the host is actively powering VBUS.
To meet compliance specifications, the USB module
(and the D+ or D- pull-up resistor) should not be enabled
until the host actively drives VBUS high. One of the 5.5V
tolerant I/O pins may be used for this purpose.
The application should never source any current onto
the 5V VBUS pin of the USB cable.
The Dual Power mode with Self-Power Dominance
(Figure 18-5) allows the application to use internal
power primarily, but switch to power from the USB
when no internal power is available. Dual power
devices must also meet all of the special requirements
for inrush current and Suspend mode current previ-
ously described, and must not enable the USB module
until VBUS is driven high.
FIGURE 18-3: BUS POWER ONLY
FIGURE 18-4: SELF-POWER ONLY
PIC®MCU Host
Controller/HUB
VUSB
D+
D-
1.5 k
VDD
VUSB
VSS
VBUS
~5V
3.3V
Low IQ Regulator
Attach Sense VBUS
100
VDD
VUSB
VSS
VSELF
~3.3V
Attach Sense
100 k
100
VBUS
~5V VBUS
PIC24FJ256GB210 FAMILY
DS39975A-page 236 2010 Microchip Technology Inc.
FIGURE 18-5: DUAL POWER EXAMPLE
18.1.2 HOST AND OTG MODES
18.1.2.1 D+ and D- Pull-Down Resistors
PIC24FJ256GB210 family devices have a built-in
15 k pull-down resistor on the D+ and D- lines. These
are used in tandem to signal to the bus that the micro-
controller is operating in Host mode. They are engaged
by setting the HOSTEN bit (U1CON<3>). If the OTGEN
bit (U1OTGCON<2>) is set, then these pull-downs are
enabled by setting the DPPULDWN and DMPULDWN
bits (U1OTGCON<5:4>).
18.1.2.2 Power Configurations
In Host mode, as well as Host mode in On-The-Go
operation, the “USB 2.0 OTG Specification” requires
that the host application should supply power on VBUS.
Since the microcontroller is running below VBUS, and is
not able to source sufficient current, a separate power
supply must be provided.
When the application is always operating in Host mode,
a simple circuit can be used to supply VBUS and
regulate current on the bus (Figure 18-6). For OTG
operation, it is necessary to be able to turn VBUS on or
off as needed, as the microcontroller switches between
Device and Host modes. A typical example using an
external charge pump is shown in Figure 18-7.
FIGURE 18-6: HOST INTERFACE EXAMPLE
VDD
VUSB
VBUS
VSS
Attach Sense
VBUS
VSELF
100
~3.3V
~5V
100 k
3.3V
Low IQ
Regulator
A/D Pin
VUSB
VDD
VSS
D+
D-
VBUS
ID
D+
D-
VBUS
ID
GND
+3.3V +3.3V
Polymer PTC
Thermal Fuse
Micro A/B
Connector
150 µF 2 k
2 k
0.1 µF,
3.3V
+5V PIC® MCU
2010 Microchip Technology Inc. DS39975A-page 237
PIC24FJ256GB210 FAMILY
FIGURE 18-7: OTG INTERFACE EXAMPLE
18.1.2.3 VBUS Voltage Generation with
External Devices
When operating as a USB host, either as an A-device
in an OTG configuration or as an embedded host, VBUS
must be supplied to the attached device.
PIC24FJ256GB210 family devices have an internal
VBUS boost assist to help generate the required 5V
VBUS from the available voltages on the board. This is
comprised of a simple PWM output to control a Switch
mode power supply, and built-in comparators to
monitor output voltage and limit current.
To enable voltage generation:
1. Verify that the USB module is powered
(U1PWRC<0> = 1) and that the VBUS discharge
is disabled (U1OTGCON<0> = 0).
2. Set the PWM period (U1PWMRRS<7:0>) and
duty cycle (U1PWMRRS<15:8>) as required.
3. Select the required polarity of the output signal
based on the configuration of the external circuit
with the PWMPOL bit (U1PWMCON<9>).
4. Select the desired target voltage using the
VBUSCHG bit (U1OTGCON<1>).
5. Enable the PWM counter by setting the CNTEN
bit to ‘1’ (U1PWMCON<8>).
6. Enable the PWM module by setting the PWMEN
bit (U1PWMCON<15>) to ‘1’.
7. Enable the VBUS generation circuit
(U1OTGCON<3> = 1).
18.1.3 USING AN EXTERNAL INTERFACE
Some applications may require the USB interface to be
isolated from the rest of the system.
PIC24FJ256GB210 family devices include a complete
interface to communicate with and control an external
USB transceiver, including the control of data line
pull-ups and pull-downs. The VBUS voltage generation
control circuit can also be configured for different VBUS
generation topologies.
Refer to the “PIC24F Family Reference Manual”,
Section 27. “USB On-The-Go (OTG)” for information
on using the external interface.
18.1.4 CALCULATING TRANSCEIVER
POWER REQUIREMENTS
The USB transceiver consumes a variable amount of
current depending on the characteristic impedance of
the USB cable, the length of the cable, the VUSB supply
voltage and the actual data patterns moving across the
USB cable. Longer cables have larger capacitances
and consume more total energy when switching output
states. The total transceiver current consumption will
be application-specific. Equation 18-1 can help
estimate how much current actually may be required in
full-speed applications.
Refer to the “PIC24F Family Reference Manual”,
Section 27. “USB On-The-Go (OTG)” for a complete
discussion on transceiver power consumption.
I/O
I/O
VSS
D+
D-
VBUS
ID
D+
D-
VBUS
ID
GND
Micro A/B
Connector 40 k
4.7 µF
VDD
PIC® MCU
10 µF
VIN
SELECT
SHND
PGOOD
MCP1253
VOUT
C+
C-
GND
1 µF
Note: This section describes the general
process for VBUS voltage generation and
control. Please refer to the “PIC24F
Family Reference Manual” for additional
examples.
PIC24FJ256GB210 FAMILY
DS39975A-page 238 2010 Microchip Technology Inc.
EQUATION 18-1: ESTIMATING USB TRANSCEIVER CURRENT CONSUMPTION
Legend: VUSB – Voltage applied to the VUSB pin in volts (3.0V to 3.6V).
PZERO – Percentage (in decimal) of the IN traffic bits sent by the PIC® microcontroller that are a value
of ‘0’.
PIN – Percentage (in decimal) of total bus bandwidth that is used for IN traffic.
LCABLE – Length (in meters) of the USB cable. The “USB 2.0 OTG Specification” requires that
full-speed applications use cables no longer than 5m.
IPULLUP – Current which the nominal, 1.5 k pull-up resistor (when enabled) must supply to the USB
cable.
40 mA • VUSB • PZERO • PIN • LCABLE
IXCVR = 3.3V • 5m + IPULLUP
2010 Microchip Technology Inc. DS39975A-page 239
PIC24FJ256GB210 FAMILY
18.2 USB Buffer Descriptors and
the BDT
Endpoint buffer control is handled through a structure
called the Buffer Descriptor Table (BDT). This provides
a flexible method for users to construct and control
endpoint buffers of various lengths and configurations.
The BDT can be located in any available, 512-byte
aligned block of data RAM. The BDT Pointer
(U1BDTP1) contains the upper address byte of the
BDT and sets the location of the BDT in RAM. The user
must set this pointer to indicate the table’s location.
The BDT is composed of Buffer Descriptors (BDs)
which are used to define and control the actual buffers
in the USB RAM space. Each BD consists of two, 16-bit
“soft” (non-fixed-address) registers, BDnSTAT and
BDnADR, where n represents one of the 64 possible
BDs (range of 0 to 63). BDnSTAT is the status register
for BDn, while BDnADR specifies the starting address
for the buffer associated with BDn.
Depending on the endpoint buffering configuration
used, there are up to 64 sets of Buffer Descriptors, for
a total of 256 bytes. At a minimum, the BDT must be at
least 8 bytes long. This is because the “USB 2.0 OTG
Specification” mandates that every device must have
Endpoint 0 with both input and output for initial setup.
Endpoint mapping in the BDT is dependent on three
variables:
• Endpoint number (0 to 15)
• Endpoint direction (RX or TX)
• Ping-pong settings (U1CNFG1<1:0>)
Figure 18-8 illustrates how these variables are used to
map endpoints in the BDT.
In Host mode, only Endpoint 0 Buffer Descriptors are
used. All transfers utilize the Endpoint 0 Buffer Descrip-
tor and Endpoint Control register (U1EP0). For received
packets, the attached device’s source endpoint is
indicated by the value of ENDPT<3:0> in the USB status
register (U1STAT<7:4>). For transmitted packets, the
attached device’s destination endpoint is indicated by
the value written to the Token register (U1TOK).
FIGURE 18-8: BDT MAPPING FOR ENDPOINT BUFFERING MODES
Note: Since BDnADR is a 16-bit register, only
the first 64 Kbytes of RAM can be
accessed by the USB module.
EP1 TX Even
EP1 RX Even
EP1 RX Odd
EP1 TX Odd
Descriptor
Descriptor
Descriptor
Descriptor
EP1 TX
EP15 TX
EP1 RX
EP0 RX
PPB<1:0> = 00
EP0 TX
EP1 TX
No Ping-Pong
EP15 TX
EP0 TX
EP0 RX Even
PPB<1:0> = 01
EP0 RX Odd
EP1 RX
Ping-Pong Buffer
EP15 TX Odd
EP0 TX Even
EP0 RX Even
PPB<1:0> = 10
EP0 RX Odd
EP0 TX Odd
Ping-Pong Buffers
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Descriptor
Note: Memory area is not shown to scale.
Descriptor
Descriptor
Descriptor
Descriptor
Buffers on EP0 OUT on all EPs
EP1 TX Even
EP1 RX Even
EP1 RX Odd
EP1 TX Odd
Descriptor
Descriptor
Descriptor
Descriptor
EP15 TX Odd
EP0 RX
PPB<1:0> = 11
EP0 TX
Ping-Pong Buffers
Descriptor
Descriptor
Descriptor
on all other EPs
except EP0
Total BDT Space: Total BDT Space: Total BDT Space: Total BDT Space:
128 Bytes 132 Bytes 256 Bytes 248 Bytes
PIC24FJ256GB210 FAMILY
DS39975A-page 240 2010 Microchip Technology Inc.
BDs have a fixed relationship to a particular endpoint,
depending on the buffering configuration. Table 18-2
provides the mapping of BDs to endpoints. This rela-
tionship also means that gaps may occur in the BDT if
endpoints are not enabled contiguously. This, theoreti-
cally, means that the BDs for disabled endpoints could
be used as buffer space. In practice, users should
avoid using such spaces in the BDT unless a method
of validating BD addresses is implemented.
18.2.1 BUFFER OWNERSHIP
Because the buffers and their BDs are shared between
the CPU and the USB module, a simple semaphore
mechanism is used to distinguish which is allowed to
update the BD and associated buffers in memory. This
is done by using the UOWN bit as a semaphore to
distinguish which is allowed to update the BD and
associated buffers in memory. UOWN is the only bit
that is shared between the two configurations of
BDnSTAT.
When UOWN is clear, the BD entry is “owned” by the
microcontroller core. When the UOWN bit is set, the BD
entry and the buffer memory are “owned” by the USB
peripheral. The core should not modify the BD or its
corresponding data buffer during this time. Note that
the microcontroller core can still read BDnSTAT while
the SIE owns the buffer and vice versa.
The Buffer Descriptors have a different meaning based
on the source of the register update. Register 18-1 and
Register 18-2 show the differences in BDnSTAT
depending on its current “ownership”.
When UOWN is set, the user can no longer depend on
the values that were written to the BDs. From this point,
the USB module updates the BDs as necessary, over-
writing the original BD values. The BDnSTAT register is
updated by the SIE with the token PID and the transfer
count is updated.
18.2.2 DMA INTERFACE
The USB OTG module uses a dedicated DMA to
access both the BDT and the endpoint data buffers.
Since part of the address space of the DMA is dedi-
cated to the Buffer Descriptors, a portion of the memory
connected to the DMA must comprise a contiguous
address space properly mapped for the access by the
module.
TABLE 18-2: ASSIGNMENT OF BUFFER DESCRIPTORS FOR THE DIFFERENT
BUFFERING MODES
Endpoint
BDs Assigned to Endpoint
Mode 0
(No Ping-Pong)
Mode 1
(Ping-Pong on EP0 OUT)
Mode 2
(Ping-Pong on all EPs)
Mode 3
(Ping-Pong on all other EPs,
except EP0)
Out In Out In Out In Out In
0 0 1 0 (E), 1 (O) 2 0 (E), 1 (O) 2 (E), 3 (O) 0 1
1 2 3 3 4 4 (E), 5 (O) 6 (E), 7 (O) 2 (E), 3 (O) 4 (E), 5 (O)
2 4 5 5 6 8 (E), 9 (O) 10 (E), 11 (O) 6 (E), 7 (O) 8 (E), 9 (O)
3 6 7 7 8 12 (E), 13 (O) 14 (E), 15 (O) 10 (E), 11 (O) 12 (E), 13 (O)
4 8 9 9 10 16 (E), 17 (O) 18 (E), 19 (O) 14 (E), 15 (O) 16 (E), 17 (O)
5 10 11 11 12 20 (E), 21 (O) 22 (E), 23 (O) 18 (E), 19 (O) 20 (E), 21 (O)
6 12 13 13 14 24 (E), 25 (O) 26 (E), 27 (O) 22 (E), 23 (O) 24 (E), 25 (O)
7 14 15 15 16 28 (E), 29 (O) 30 (E), 31 (O) 26 (E), 27 (O) 28 (E), 29 (O)
8 16 17 17 18 32 (E), 33 (O) 34 (E), 35 (O) 30 (E), 31 (O) 32 (E), 33 (O)
9 18 19 19 20 36 (E), 37 (O) 38 (E), 39 (O) 34 (E), 35 (O) 36 (E), 37 (O)
10 20 21 21 22 40 (E), 41 (O) 42 (E), 43 (O) 38 (E), 39 (O) 40 (E), 41 (O)
11 22 23 23 24 44 (E), 45 (O) 46 (E), 47 (O) 42 (E), 43 (O) 44 (E), 45 (O)
12 24 25 25 26 48 (E), 49 (O) 50 (E), 51 (O) 46 (E), 47 (O) 48 (E), 49 (O)
13 26 27 27 28 52 (E), 53 (O) 54 (E), 55 (O) 50 (E), 51 (O) 52 (E), 53 (O)
14 28 29 29 30 56 (E), 57 (O) 58 (E), 59 (O) 54 (E), 55 (O) 56 (E), 57 (O)
15 30 31 31 32 60 (E), 61 (O) 62 (E), 63 (O) 58 (E), 59 (O) 60 (E), 61 (O)
Legend: (E) = Even transaction buffer, (O) = Odd transaction buffer
2010 Microchip Technology Inc. DS39975A-page 241
PIC24FJ256GB210 FAMILY
REGISTER 18-1: BDnSTAT: BUFFER DESCRIPTOR n STATUS REGISTER PROTOTYPE, USB
MODE (BD0STAT THROUGH BD63STAT)
R/W-x R/W-x R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
UOWN DTS PID3 PID2 PID1 PID0 BC9 BC8
bit 15 bit 8
R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
BC7 BC6 BC5 BC4 BC3 BC2 BC1 BC0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 UOWN: USB Own bit
1 = The USB module owns the BD and its corresponding buffer; the CPU must not modify the BD or
the buffer
bit 14 DTS: Data Toggle Packet bit
1 = Data 1 packet
0 = Data 0 packet
bit 13-10 PID<3:0>: Packet Identifier bits (written by the USB module)
In Device mode:
Represents the PID of the received token during the last transfer.
In Host mode:
Represents the last returned PID or the transfer status indicator.
bit 9-0 BC<9:0>: Byte Count bits
This represents the number of bytes to be transmitted or the maximum number of bytes to be received
during a transfer. Upon completion, the byte count is updated by the USB module with the actual
number of bytes transmitted or received.
PIC24FJ256GB210 FAMILY
DS39975A-page 242 2010 Microchip Technology Inc.
REGISTER 18-2: BDnSTAT: BUFFER DESCRIPTOR n STATUS REGISTER PROTOTYPE, CPU
MODE (BD0STAT THROUGH BD63STAT)
R/W-x R/W-x r-0 r-0 R/W-x R/W-x R/W-x, HSC R/W-x, HSC
UOWN DTS(1) Reserved Reserved DTSEN BSTALL BC9 BC8
bit 15 bit 8
R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
BC7 BC6 BC5 BC4 BC3 BC2 BC1 BC0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit r = Reserved bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘r’ = Reserved bit x = Bit is unknown
bit 15 UOWN: USB Own bit
0 = The microcontroller core owns the BD and its corresponding buffer; the USB module ignores all
other fields in the BD
bit 14 DTS: Data Toggle Packet bit(1)
1 = Data 1 packet
0 = Data 0 packet
bit 13-12 Reserved: Maintain as ‘0’
bit 11 DTSEN: Data Toggle Synchronization Enable bit
1 = Data toggle synchronization is enabled; data packets with incorrect sync value will be ignored
0 = No data toggle synchronization is performed
bit 10 BSTALL: Buffer Stall Enable bit
1 = Buffer STALL enabled; STALL handshake issued if a token is received that would use the BD in
the given location (UOWN bit remains set, BD value is unchanged); corresponding EPSTALL bit
will get set on any STALL handshake
0 = Buffer STALL disabled
bit 9-0 BC<9:0>: Byte Count bits
This represents the number of bytes to be transmitted or the maximum number of bytes to be received
during a transfer. Upon completion, the byte count is updated by the USB module with the actual
number of bytes transmitted or received.
Note 1: This bit is ignored unless DTSEN = 1.
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18.3 USB Interrupts
The USB OTG module has many conditions that can
be configured to cause an interrupt. All interrupt
sources use the same interrupt vector.
Figure 18-9 shows the interrupt logic for the USB
module. There are two layers of interrupt registers in
the USB module. The top level consists of overall USB
status interrupts; these are enabled and flagged in the
U1IE and U1IR registers, respectively. The second
level consists of USB error conditions, which are
enabled and flagged in the U1EIR and U1EIE registers.
An interrupt condition in any of these triggers a USB
Error Interrupt Flag (UERRIF) in the top level.
Interrupts may be used to trap routine events in a USB
transaction. Figure 18-10 provides some common
events within a USB frame and their corresponding
interrupts.
FIGURE 18-9: USB OTG INTERRUPT FUNNEL
DMAEF
DMAEE
BTOEF
BTOEE
DFN8EF
DFN8EE
CRC16EF
CRC16EE
CRC5EF (EOFEF)
CRC5EE (EOFEE)
PIDEF
PIDEE
ATTACHIF
ATTACHIE
RESUMEIF
RESUMEIE
IDLEIF
IDLEIE
TRNIF
TRNIE
SOFIF
SOFIE
URSTIF (DETACHIF)
URSTIE (DETACHIE)
(UERRIF)
UERRIE
Set USB1IF
STALLIF
STALLIE
BTSEF
BTSEE
T1MSECIF
TIMSECIE
LSTATEIF
LSTATEIE
ACTVIF
ACTVIE
SESVDIF
SESVDIE
SESENDIF
SESENDIE
VBUSVDIF
VBUSVDIE
IDIF
IDIE
Second Level (USB Error) Interrupts
Top Level (USB Status) Interrupts
Top Level (USB OTG) Interrupts
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18.3.1 CLEARING USB OTG INTERRUPTS
Unlike device level interrupts, the USB OTG interrupt
status flags are not freely writable in software. All USB
OTG flag bits are implemented as hardware set only
bits. Additionally, these bits can only be cleared in
software by writing a ‘1’ to their locations (i.e., perform-
ing a MOV type instruction). Writing a ‘0’ to a flag bit (i.e.,
a BCLR instruction) has no effect.
FIGURE 18-10: EXAMPLE OF A USB TRANSACTION AND INTERRUPT EVENTS
18.4 Device Mode Operation
The following section describes how to perform a com-
mon Device mode task. In Device mode, USB transfers
are performed at the transfer level. The USB module
automatically performs the status phase of the transfer.
18.4.1 ENABLING DEVICE MODE
1. Reset the Ping-Pong Buffer Pointers by setting,
then clearing, the Ping-Pong Buffer Reset bit,
PPBRST (U1CON<1>).
2. Disable all interrupts (U1IE and U1EIE = 00h).
3. Clear any existing interrupt flags by writing FFh
to U1IR and U1EIR.
4. Verify that VBUS is present (non OTG devices
only).
5. Enable the USB module by setting the USBEN
bit (U1CON<0>).
6. Set the OTGEN bit (U1OTGCON<2>) to enable
OTG operation.
7. Enable the endpoint zero buffer to receive the
first setup packet by setting the EPRXEN and
EPHSHK bits for Endpoint 0 (U1EP0<3,0> = 1).
8. Power up the USB module by setting the
USBPWR bit (U1PWRC<0>).
9. Enable the D+ pull-up resistor to signal an attach
by setting DPPULUP bit (U1OTGCON<7>).
Note: Throughout this data sheet, a bit that can
only be cleared by writing a ‘1’ to its loca-
tion is referred to as “Write 1 to clear”. In
register descriptions, this function is
indicated by the descriptor, “K”.
USB Reset
SOFRESET SETUP DATA STATUS SOF
SETUP Token Data ACK
OUT Token Empty Data ACK
Start-of-Frame (SOF)
IN Token Data ACK
SOFIF
URSTIF
1ms Frame
Differential Data
From Host From Host To Ho s t
From Host To Host From Host
From Host From Host To H ost
Transaction
Control Transfer(1)
Transaction
Complete
Note 1: The control transfer shown here is only an example showing events that can occur for every transaction. Typical
control transfers will spread across multiple frames.
Set TRNIF
Set TRNIF
Set TRNIF
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18.4.2 RECEIVING AN IN TOKEN IN
DEVICE MODE
1. Attach to a USB host and enumerate as described
in Chapter 9 of the “USB 2.0 Specification”.
2. Create a data buffer and populate it with the data
to send to the host.
3. In the appropriate (even or odd) TX BD for the
desired endpoint:
a) Set up the status register (BDnSTAT) with
the correct data toggle (DATA0/1) value and
the byte count of the data buffer.
b) Set up the address register (BDnADR) with
the starting address of the data buffer.
c) Set the UOWN bit of the status register to
‘1’.
4. When the USB module receives an IN token, it
automatically transmits the data in the buffer.
Upon completion, the module updates the status
register (BDnSTAT) and sets the Transfer
Complete Interrupt Flag, TRNIF (U1IR<3>).
18.4.3 RECEIVING AN OUT TOKEN IN
DEVICE MODE
1. Attach to a USB host and enumerate as
described in Chapter 9 of the “USB 2.0
Specification”.
2. Create a data buffer with the amount of data you
are expecting from the host.
3. In the appropriate (even or odd) TX BD for the
desired endpoint:
a) Set up the status register (BDnSTAT) with
the correct data toggle (DATA0/1) value and
the byte count of the data buffer.
b) Set up the address register (BDnADR) with
the starting address of the data buffer.
c) Set the UOWN bit of the status register to
‘1’.
4. When the USB module receives an OUT token,
it automatically receives the data sent by the
host to the buffer. Upon completion, the module
updates the status register (BDnSTAT) and sets
the Transfer Complete Interrupt Flag, TRNIF
(U1IR<3>).
18.5 Host Mode Operation
The following sections describe how to perform common
Host mode tasks. In Host mode, USB transfers are
invoked explicitly by the host software. The host
software is responsible for the Acknowledge portion of
the transfer. Also, all transfers are performed using the
Endpoint 0 Control register (U1EP0) and Buffer
Descriptors.
18.5.1 ENABLE HOST MODE AND
DISCOVER A CONNECTED DEVICE
1. Enable Host mode by setting the HOSTEN bit
(U1CON<3>). This causes the Host mode con-
trol bits in other USB OTG registers to become
available.
2. Enable the D+ and D- pull-down resistors by
setting the DPPULDWN and DMPULDWN bits
(U1OTGCON<5:4>). Disable the D+ and D-
pull-up resistors by clearing the DPPULUP and
DMPULUP bits (U1OTGCON<7:6>).
3. At this point, SOF generation begins with the
SOF counter loaded with 12,000. Eliminate
noise on the USB by clearing the SOFEN bit
(U1CON<0>) to disable Start-of-Frame packet
generation.
4. Enable the device attached interrupt by setting
the ATTACHIE bit (U1IE<6>).
5. Wait for the device attached interrupt
(U1IR<6> = 1). This is signaled by the USB
device changing the state of D+ or D- from ‘0’
to ‘1’ (SE0 to J-state). After it occurs, wait
100 ms for the device power to stabilize.
6. Check the state of the JSTATE and SE0 bits in
U1CON. If the JSTATE bit (U1CON<7>) is ‘0’,
the connecting device is low speed. If the con-
necting device is low speed, set the low
LSPDEN and LSPD bits (U1ADDR<7>, and
U1EP0<7>) to enable low-speed operation.
7. Reset the USB device by setting the USBRST
bit (U1CON<4>) for at least 50 ms, sending
Reset signaling on the bus. After 50 ms,
terminate the Reset by clearing USBRST.
8. In order to keep the connected device from
going into suspend, enable the SOF packet
generation by setting the SOFEN bit.
9. Wait 10 ms for the device to recover from Reset.
10. Perform enumeration as described by Chapter 9
of the “USB 2.0 Specification”.
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18.5.2 COMPLETE A CONTROL
TRANSACTION TO A CONNECTED
DEVICE
1. Follow the procedure described in Section 18.5.1
“Enable Host Mode and Discover a Connected
Device” to discover a device.
2. Set up the Endpoint Control register for
bidirectional control transfers by writing 0Dh to
U1EP0 (this sets the EPCONDIS, EPTXEN and
EPHSHK bits).
3. Place a copy of the device framework setup
command in a memory buffer. See Chapter 9 of
the “USB 2.0 Specification” for information on
the device framework command set.
4. Initialize the Buffer Descriptor (BD) for the
current (even or odd) TX EP0 to transfer the
eight bytes of command data for a device
framework command (i.e., GET DEVICE
DESCRIPTOR):
a) Set the BD data buffer address (BD0ADR)
to the starting address of the 8-byte
memory buffer containing the command.
b) Write 8008h to BD0STAT (this sets the
UOWN bit and sets a byte count of 8).
5. Set the USB device address of the target device
in the address register (U1ADDR<6:0>). After a
USB bus Reset, the device USB address will be
zero. After enumeration, it will be set to another
value between 1 and 127.
6. Write D0h to U1TOK; this is a SETUP token to
Endpoint 0, the target device’s default control
pipe. This initiates a SETUP token on the bus,
followed by a data packet. The device hand-
shake is returned in the PID field of BD0STAT
after the packets are complete. When the USB
module updates BD0STAT, a transfer done
interrupt is asserted (the TRNIF flag is set). This
completes the setup phase of the setup transac-
tion as referenced in Chapter 9 of the “USB 2.0
Specification”.
7. To initiate the data phase of the setup transac-
tion (i.e., get the data for the GET DEVICE
DESCRIPTOR command), set up a buffer in
memory to store the received data.
8. Initialize the current (even or odd) RX or TX (RX
for IN, TX for OUT) EP0 BD to transfer the data.
a) Write C040h to BD0STAT. This sets the
UOWN, configures Data Toggle (DTS) to
DATA1 and sets the byte count to the length
of the data buffer (64 or 40h in this case).
b) Set BD0ADR to the starting address of the
data buffer.
9. Write the Token register with the appropriate IN
or OUT token to Endpoint 0, the target device’s
default control pipe (e.g., write 90h to U1TOK for
an IN token for a GET DEVICE DESCRIPTOR
command). This initiates an IN token on the bus
followed by a data packet from the device to the
host. When the data packet completes, the
BD0STAT is written and a transfer done interrupt
is asserted (the TRNIF flag is set). For control
transfers with a single packet data phase, this
completes the data phase of the setup transac-
tion as referenced in Chapter 9 of the “USB 2.0
Specification”. If more data needs to be
transferred, return to step 8.
10. To initiate the status phase of the setup transac-
tion, set up a buffer in memory to receive or send
the zero length status phase data packet.
11. Initialize the current (even or odd) TX EP0 BD to
transfer the status data:
a) Set the BDT buffer address field to the start
address of the data buffer.
b) Write 8000h to BD0STAT (set UOWN bit,
configure DTS to DATA0 and set byte count
to 0).
12. Write the Token register with the appropriate IN
or OUT token to Endpoint 0, the target device’s
default control pipe (e.g., write 01h to U1TOK for
an OUT token for a GET DEVICE DESCRIPTOR
command). This initiates an OUT token on the
bus followed by a zero length data packet from
the host to the device. When the data packet
completes, the BD is updated with the
handshake from the device and a transfer done
interrupt is asserted (the TRNIF flag is set). This
completes the status phase of the setup
transaction as described in Chapter 9 of the
“USB 2.0 Specification”.
Note: Only one control transaction can be
performed per frame.
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18.5.3 SEND A FULL-SPEED BULK DATA
TRANSFER TO A TARGET DEVICE
1. Follow the procedure described in Section 18.5.1
“Enable Host Mode and Discover a Connected
Device” and Section 18.5.2 “Complete a Con-
trol Transaction to a Connected Device” to
discover and configure a device.
2. To enable transmit and receive transfers with
handshaking enabled, write 1Dh to U1EP0. If
the target device is a low-speed device, also set
the LSPD (U1EP0<7>) bit. If you want the hard-
ware to automatically retry indefinitely if the
target device asserts a NAK on the transfer,
clear the Retry Disable bit, RETRYDIS
(U1EP0<6>).
3. Set up the BD for the current (even or odd) TX
EP0 to transfer up to 64 bytes.
4. Set the USB device address of the target device
in the address register (U1ADDR<6:0>).
5. Write an OUT token to the desired endpoint to
U1TOK. This triggers the module’s transmit
state machines to begin transmitting the token
and the data.
6. Wait for the Transfer Done Interrupt Flag,
TRNIF. This indicates that the BD has been
released back to the microprocessor and the
transfer has completed. If the retry disable bit is
set, the handshake (ACK, NAK, STALL or
ERROR (0Fh)) is returned in the BD PID field. If
a STALL interrupt occurs, the pending packet
must be dequeued and the error condition in the
target device cleared. If a detach interrupt
occurs (SE0 for more than 2.5 µs), then the
target has detached (U1IR<0> is set).
7. Once the transfer done interrupt occurs (TRNIF
is set), the BD can be examined and the next
data packet queued by returning to step 2.
18.6 OTG Operation
18.6.1 SESSION REQUEST PROTOCOL
(SRP)
An OTG A-device may decide to power down the V
BUS
supply when it is not using the USB link through the
Session Request Protocol (SRP). Software may do this
by clearing VBUSON (U1OTGCON<3>). When the V
BUS
supply is powered down, the A-device is said to have
ended a USB session.
An OTG A-device or embedded host may repower the
VBUS supply at any time (initiate a new session). An
OTG B-device may also request that the OTG A-device
repower the VBUS supply (initiate a new session). This
is accomplished via Session Request Protocol (SRP).
Prior to requesting a new session, the B-device must
first check that the previous session has definitely
ended. To do this, the B-device must check for two
conditions:
1. VBUS supply is below the session valid voltage, and
2. Both D+ and D- have been low for at least 2 ms.
The B-device will be notified of Condition 1 by the
SESENDIF (U1OTGIR<2>) interrupt. Software will
have to manually check for Condition 2.
The B-device may aid in achieving Condition 1 by dis-
charging the VBUS supply through a resistor. Software
may do this by setting VBUSDIS (U1OTGCON<0>).
After these initial conditions are met, the B-device may
begin requesting the new session. The B-device begins
by pulsing the D+ data line. Software should do this by
setting DPPULUP (U1OTGCON<7>). The data line
should be held high for 5 to 10 ms.
The B-device then proceeds by pulsing the VBUS
supply. Software should do this by setting PUVBUS
(U1CNFG2<4>). When an A-device detects SRP sig-
naling (either via the ATTACHIF (U1IR<6>) interrupt or
via the SESVDIF (U1OTGIR<3>) interrupt), the
A-device must restore the VBUS supply by either setting
VBUSON (U1OTGCON<3>) or by setting the I/O port
controlling the external power source.
The B-device should not monitor the state of the VBUS
supply while performing VBUS supply pulsing. When the
B-device does detect that the VBUS supply has been
restored (via the SESVDIF (U1OTGIR<3>) interrupt),
the B-device must reconnect to the USB link by pulling
up D+ or D- (via the DPPULUP or DMPULUP).
The A-device must complete the SRP by driving USB
Reset signaling.
Note: USB speed, transceiver and pull-ups
should only be configured during the mod-
ule setup phase. It is not recommended to
change these settings while the module is
enabled.
Note: When the A-device powers down the VBUS
supply, the B-device must disconnect its
pull-up resistor from power. If the device is
self-powered, it can do this by clearing
DPPULUP (U1OTGCON<7>) and
DMPULUP (U1OTGCON<6>).
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18.6.2 HOST NEGOTIATION PROTOCOL
(HNP)
In USB OTG applications, a Dual Role Device (DRD) is
a device that is capable of being either a host or a
peripheral. Any OTG DRD must support Host
Negotiation Protocol (HNP).
HNP allows an OTG B-device to temporarily become
the USB host. The A-device must first enable the
B-device to follow HNP. Refer to the “On-The-Go
Supplement” to the “USB 2.0 Specification” for more
information regarding HNP. HNP may only be initiated
at full speed.
After being enabled for HNP by the A-device, the
B-device requests being the host any time that the USB
link is in suspend state, by simply indicating a discon-
nect. This can be done in software by clearing
DPPULUP and DMPULUP. When the A-device detects
the disconnect condition (via the URSTIF (U1IR<0>)
interrupt), the A-device may allow the B-device to take
over as host. The A-device does this by signaling con-
nect as a full-speed function. Software may accomplish
this by setting DPPULUP.
If the A-device responds instead with resume signaling,
the A-device remains as host. When the B-device
detects the connect condition (via ATTACHIF
(U1IR<6>), the B-device becomes host. The B-device
drives Reset signaling prior to using the bus.
When the B-device has finished in its role as host, it
stops all bus activity and turns on its D+ pull-up resistor
by setting DPPULUP. When the A-device detects a
suspend condition (Idle for 3 ms), the A-device turns off
its D+ pull-up. The A-device may also power-down the
VBUS supply to end the session. When the A-device
detects the connect condition (via ATTACHIF), the
A-device resumes host operation and drives Reset
signaling.
18.6.3 EXTERNAL VBUS COMPARATORS
The external VBUS comparator option is enabled by set-
ting the UVCMPDIS bit (U1CNFG2<1>). This disables
the internal VBUS comparators, removing the need to
attach VBUS to the microcontroller’s VBUS pin.
The external comparator interface uses either the
VCMPST1 and VCMPST2 pins, or the VBUSVLD,
SESSVLD and SESSEND pins, based upon the setting
of the UVCMPSEL bit (U1CNFG2<5>). These pins are
digital inputs and should be set in the following patterns
(see Table 18-3), based on the current level of the VBUS
voltage.
TABLE 18-3: EXTERNAL VBUS COMPARATOR STATES
If UVCMPSEL = 0
VCMPST1VCMPST2Bus Condition
00 VBUS < VB_SESS_END
10 VB_SESS_END < VBUS < VA_SESS_VLD
01 VA_SESS_VLD < VBUS < VA_VBUS_VLD
11 VBUS > VBUS_VLD
If UVCMPSEL = 1
VBUSVLD SESSVLD SESSEND Bus Condition
00 1 VBUS < VB_SESS_END
00 0 VB_SESS_END < VBUS < VA_SESS_VLD
01 0 VA_SESS_VLD < VBUS < VA_VBUS_VLD
11 0 VBUS > VBUS_VLD
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18.7 USB OTG Module Registers
There are a total of 37 memory mapped registers asso-
ciated with the USB OTG module. They can be divided
into four general categories:
• USB OTG Module Control (12)
• USB Interrupt (7)
• USB Endpoint Management (16)
• USB VBUS Power Control (2)
This total does not include the (up to) 128 BD registers
in the BDT. Their prototypes, described in
Register 18-1 and Register 18-2, are shown separately
in Section 18.2 “USB Buffer Descriptors and the
BDT”.
With the exception of U1PWMCON and U1PWMRRS,
all USB OTG registers are implemented in the Least
Significant Byte of the register. Bits in the upper byte
are unimplemented and have no function. Note that
some registers are instantiated only in Host mode,
while other registers have different bit instantiations
and functions in Device and Host modes.
The registers described in the following sections are
those that have bits with specific control and configura-
tion features. The following registers are used for data
or address values only:
• U1BDTP1: Specifies the 256-word page in data
RAM used for the BDT; 8-bit value with Bit 0 fixed
as ‘0’ for boundary alignment.
• U1FRML and U1FRMH: Contains the 11-bit byte
counter for the current data frame.
• U1PWMRRS: Contains the 8-bit value for PWM
duty cycle bits<15:8> and PWM period
bits<7:0> for the VBUS boost assist PWM module.
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18.7.1 USB OTG MODULE CONTROL REGISTERS
REGISTER 18-3: U1OTGSTAT: USB OTG STATUS REGISTER (HOST MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R-0, HSC U-0 R-0, HSC U-0 R-0, HSC R-0, HSC U-0 R-0, HSC
ID —LSTATE— SESVD SESEND — VBUSVD
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit W = Writable bit HSC = Hardware Settable/Clearable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 ID: ID Pin State Indicator bit
1 = No plug is attached or a type B cable has been plugged into the USB receptacle
0 = A type A plug has been plugged into the USB receptacle
bit 6 Unimplemented: Read as ‘0’
bit 5 LSTATE: Line State Stable Indicator bit
1 = The USB line state (as defined by SE0 and JSTATE) has been stable for the previous 1 ms
0 = The USB line state has not been stable for the previous 1 ms
bit 4 Unimplemented: Read as ‘0’
bit 3 SESVD: Session Valid Indicator bit
1 =The V
BUS voltage is above VA_SESS_VLD (as defined in the “USB 2.0 OTG Specification”) on the
A or B-device
0 =The VBUS voltage is below VA_SESS_VLD on the A or B-device
bit 2 SESEND: B Session End Indicator bit
1 =The VBUS voltage is below VB_SESS_END (as defined in the “USB 2.0 OTG Specification”) on the
B-device
0 =The V
BUS voltage is above VB_SESS_END on the B-device
bit 1 Unimplemented: Read as ‘0’
bit 0 VBUSVD: A VBUS Valid Indicator bit
1 =The V
BUS voltage is above VA_VBUS_VLD (as defined in the “USB 2.0 OTG Specification”) on the
A-device
0 =The V
BUS voltage is below VA_VBUS_VLD on the A-device
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REGISTER 18-4: U1OTGCON: USB ON-THE-GO CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
DPPULUP DMPULUP DPPULDWN(1) DMPULDWN(1) VBUSON(1) OTGEN(1) VBUSCHG(1) VBUSDIS(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 DPPULUP: D+ Pull-up Enable bit
1 = D+ data line pull-up resistor is enabled
0 = D+ data line pull-up resistor is disabled
bit 6 DMPULUP: D- Pull-up Enable bit
1 = D- data line pull-up resistor is enabled
0 = D- data line pull-up resistor is disabled
bit 5 DPPULDWN: D+ Pull-Down Enable bit
(1)
1 = D+ data line pull-down resistor is enabled
0 = D+ data line pull-down resistor is disabled
bit 4 DMPULDWN: D- Pull-Down Enable bit
(1)
1 = D- data line pull-down resistor is enabled
0 = D- data line pull-down resistor is disabled
bit 3 VBUSON: VBUS Power-on bit
(1)
1 =VBUS line is powered
0 =V
BUS line is not powered
bit 2 OTGEN: OTG Features Enable bit
(1)
1 = USB OTG is enabled; all D+/D- pull-up and pull-down bits are enabled
0 = USB OTG is disabled; D+/D- pull-up and pull-down bits are controlled in hardware by the settings
of the HOSTEN and USBEN (U1CON<3,0>) bits
bit 1 VBUSCHG: VBUS Charge Select bit
(1)
1 =VBUS line is set to charge to 3.3V
0 =V
BUS line is set to charge to 5V
bit 0 VBUSDIS: VBUS Discharge Enable bit
(1)
1 =VBUS line is discharged through a resistor
0 =V
BUS line is not discharged
Note 1: These bits are only used in Host mode; do not use in Device mode.
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REGISTER 18-5: U1PWRC: USB POWER CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0, HS U-0 U-0 R/W-0 U-0 U-0 R/W-0, HC R/W-0
UACTPND — — USLPGRD — — USUSPND USBPWR
bit 7 bit 0
Legend: HS = Hardware Settable bit HC = Hardware Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 UACTPND: USB Activity Pending bit
1 = Module should not be suspended at the moment (requires the USLPGRD bit to be set)
0 = Module may be suspended or powered down
bit 6-5 Unimplemented: Read as ‘0’
bit 4 USLPGRD: Sleep/Suspend Guard bit
1 = Indicate to the USB module that it is about to be suspended or powered down
0 = No suspend
bit 3-2 Unimplemented: Read as ‘0’
bit 1 USUSPND: USB Suspend Mode Enable bit
1 = USB OTG module is in Suspend mode; USB clock is gated and the transceiver is placed in a
low-power state
0 = Normal USB OTG operation
bit 0 USBPWR: USB Operation Enable bit
1 = USB OTG module is enabled
0 = USB OTG module is disabled(1)
Note 1: Do not clear this bit unless the HOSTEN, USBEN and OTGEN bits (U1CON<3,0> and U1OTGCON<2>)
are all cleared.
2010 Microchip Technology Inc. DS39975A-page 253
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REGISTER 18-6: U1STAT: USB STATUS REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R-0, HSC R-0, HSC R-0, HSC R-0, HSC R-0, HSC R-0, HSC U-0 U-0
ENDPT3 ENDPT2 ENDPT1 ENDPT0 DIR PPBI(1) — —
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit W = Writable bit HSC = Hardware Settable/Clearable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7-4 ENDPT<3:0>: Number of the Last Endpoint Activity bits
(Represents the number of the BDT updated by the last USB transfer.)
1111 = Endpoint 15
1110 = Endpoint 14
.
.
.
0001 = Endpoint 1
0000 = Endpoint 0
bit 3 DIR: Last BD Direction Indicator bit
1 = The last transaction was a transmit transfer (TX)
0 = The last transaction was a receive transfer (RX)
bit 2 PPBI: Ping-Pong BD Pointer Indicator bit(1)
1 = The last transaction was to the odd BD bank
0 = The last transaction was to the even BD bank
bit 1-0 Unimplemented: Read as ‘0’
Note 1: This bit is only valid for endpoints with available even and odd BD registers.
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DS39975A-page 254 2010 Microchip Technology Inc.
REGISTER 18-7: U1CON: USB CONTROL REGISTER (DEVICE MODE)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 R-x, HSC R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0
— SE0 PKTDIS — HOSTEN RESUME PPBRST USBEN
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit W = Writable bit HSC = Hardware Settable/Clearable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-7 Unimplemented: Read as ‘0’
bit 6 SE0: Live Single-Ended Zero Flag bit
1 = Single-ended zero is active on the USB bus
0 = No single-ended zero is detected
bit 5 PKTDIS: Packet Transfer Disable bit
1 = SIE token and packet processing are disabled; automatically set when a SETUP token is received
0 = SIE token and packet processing are enabled
bit 4 Unimplemented: Read as ‘0’
bit 3 HOSTEN: Host Mode Enable bit
1 = USB host capability is enabled; pull-downs on D+ and D- are activated in hardware
0 = USB host capability is disabled
bit 2 RESUME: Resume Signaling Enable bit
1 = Resume signaling is activated
0 = Resume signaling is disabled
bit 1 PPBRST: Ping-Pong Buffers Reset bit
1 = Reset all Ping-Pong Buffer Pointers to the even BD banks
0 = Ping-Pong Buffer Pointers are not reset
bit 0 USBEN: USB Module Enable bit
1 = USB module and supporting circuitry are enabled (device attached); D+ pull-up is activated in hardware
0 = USB module and supporting circuitry are disabled (device detached)
2010 Microchip Technology Inc. DS39975A-page 255
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REGISTER 18-8: U1CON: USB CONTROL REGISTER (HOST MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R-x, HSC R-x, HSC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
JSTATE SE0 TOKBUSY USBRST HOSTEN RESUME PPBRST SOFEN
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit W = Writable bit HSC = Hardware Settable/Clearable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 JSTATE: Live Differential Receiver J-State Flag bit
1 = J-state (differential ‘0’ in low speed, differential ‘1’ in full speed) is detected on the USB
0 = No J-state is detected
bit 6 SE0: Live Single-Ended Zero Flag bit
1 = Single-ended zero is active on the USB bus
0 = No single-ended zero is detected
bit 5 TOKBUSY: Token Busy Status bit
1 = Token is being executed by the USB module in On-The-Go state
0 = No token is being executed
bit 4 USBRST: Module Reset bit
1 = USB Reset has been generated for software Reset; application must set this bit for 50 ms, then
clear it
0 = USB Reset is terminated
bit 3 HOSTEN: Host Mode Enable bit
1 = USB host capability is enabled; pull-downs on D+ and D- are activated in hardware
0 = USB host capability is disabled
bit 2 RESUME: Resume Signaling Enable bit
1 = Resume signaling is activated; software must set bit for 10 ms and then clear to enable remote
wake-up
0 = Resume signaling is disabled
bit 1 PPBRST: Ping-Pong Buffers Reset bit
1 = Reset all Ping-Pong Buffer Pointers to the even BD banks
0 = Ping-Pong Buffer Pointers are not reset
bit 0 SOFEN: Start-of-Frame Enable bit
1 = Start-of-Frame token is sent every one 1 ms
0 = Start-of-Frame token is disabled
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DS39975A-page 256 2010 Microchip Technology Inc.
REGISTER 18-9: U1ADDR: USB ADDRESS REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LSPDEN
(1)
ADDR6 ADDR5 ADDR4 ADDR3 ADDR2 ADDR1 ADDR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 LSPDEN: Low-Speed Enable Indicator bit(1)
1 = USB module operates at low speed
0 = USB module operates at full speed
bit 6-0 ADDR<6:0>: USB Device Address bits
Note 1: Host mode only. In Device mode, this bit is unimplemented and read as ‘0’.
REGISTER 18-10: U1TOK: USB TOKEN REGISTER (HOST MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
PID3 PID2 PID1 PID0 EP3 EP2 EP1 EP0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7-4 PID<3:0>: Token Type Identifier bits
1101 = SETUP (TX) token type transaction(1)
1001 = IN (RX) token type transaction(1)
0001 = OUT (TX) token type transaction(1)
bit 3-0 EP<3:0>: Token Command Endpoint Address bits
This value must specify a valid endpoint on the attached device.
Note 1: All other combinations are reserved and are not to be used.
2010 Microchip Technology Inc. DS39975A-page 257
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REGISTER 18-11: U1SOF: USB OTG START-OF-TOKEN THRESHOLD REGISTER (HOST MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CNT7 CNT6 CNT5 CNT4 CNT3 CNT2 CNT1 CNT0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7-0 CNT<7:0>: Start-of-Frame Size bits
Value represents 10 + (packet size of n bytes). For example:
0100 1010 = 64-byte packet
0010 1010 = 32-byte packet
0001 0010 = 8-byte packet
REGISTER 18-12: U1CNFG1: USB CONFIGURATION REGISTER 1
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 U-0 R/W-0 U-0 U-0 R/W-0 R/W-0
UTEYE UOEMON(1) — USBSIDL —— PPB1 PPB0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 UTEYE: USB Eye Pattern Test Enable bit
1 = Eye pattern test is enabled
0 = Eye pattern test is disabled
bit 6 UOEMON: USB OE Monitor Enable bit(1)
1 =OE signal is active; it indicates intervals during which the D+/D- lines are driving
0 =OE signal is inactive
bit 5 Unimplemented: Read as ‘0’
bit 4 USBSIDL: USB OTG Stop in Idle Mode bit
1 = Discontinue module operation when the device enters Idle mode
0 = Continue module operation in Idle mode
bit 3-2 Unimplemented: Read as ‘0’
bit 1-0 PPB<1:0>: Ping-Pong Buffers Configuration bits
11 = Even/Odd Ping-Pong Buffers are enabled for Endpoints 1 to 15
10 = Even/Odd Ping-Pong Buffers are enabled for all endpoints
01 = Even/Odd Ping-Pong Buffers are enabled for OUT Endpoint 0
00 = Even/Odd Ping-Pong Buffers are disabled
Note 1: This bit is only active when the UTRDIS bit (U1CNFG2<0>) is set.
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DS39975A-page 258 2010 Microchip Technology Inc.
REGISTER 18-13: U1CNFG2: USB CONFIGURATION REGISTER 2
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—— UVCMPSEL PUVBUS EXTI2CEN
UVBUSDIS
(1)
UVCMPDIS
(1)
UTRDIS(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-6 Unimplemented: Read as ‘0’
bit 5 UVCMPSEL: VBUS Comparator External Interface Selection bit
1 =Use V
BUSVLD, SESSVLD and SESSEND as comparator interface pins
0 =Use V
CMPST1 and VCMPST2 as comparator interface pins
bit 4 PUVBUS: VBUS Pull-Up Enable bit
1 = Pull-up on VBUS pin is enabled
0 = Pull-up on VBUS pin is disabled
bit 3 EXTI2CEN: I2C™ Interface For External Module Control Enable bit
1 = External module(s) is controlled via the I2C™ interface
0 = External module(s) controlled via the dedicated pins
bit 2 UVBUSDIS: On-Chip 5V Boost Regulator Builder Disable bit(1)
1 = On-chip boost regulator builder is disabled; digital output control interface is enabled
0 = On-chip boost regulator builder is active
bit 1 UVCMPDIS: On-Chip VBUS Comparator Disable bit(1)
1 = On-chip charge VBUS comparator is disabled; digital input status interface is enabled
0 = On-chip charge VBUS comparator is active
bit 0 UTRDIS: On-Chip Transceiver Disable bit(1)
1 = On-chip transceiver is disabled; digital transceiver interface is enabled
0 = On-chip transceiver is active
Note 1: Never change these bits while the USBPWR bit is set (U1PWRC<0> = 1).
2010 Microchip Technology Inc. DS39975A-page 259
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18.7.2 USB INTERRUPT REGISTERS
REGISTER 18-14: U1OTGIR: USB OTG INTERRUPT STATUS REGISTER (HOST MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS U-0 R/K-0, HS
IDIF T1MSECIF LSTATEIF ACTVIF SESVDIF SESENDIF — VBUSVDIF
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit K = Write ‘1’ to clear bit HS = Hardware Settable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 IDIF: ID State Change Indicator bit
1 = Change in ID state is detected
0 = No ID state change is detected
bit 6 T1MSECIF: 1 Millisecond Timer bit
1 = The 1 millisecond timer has expired
0 = The 1 millisecond timer has not expired
bit 5 LSTATEIF: Line State Stable Indicator bit
1 = USB line state (as defined by the SE0 and JSTATE bits) has been stable for 1 ms, but different from
the last time
0 = USB line state has not been stable for 1 ms
bit 4 ACTVIF: Bus Activity Indicator bit
1 = Activity on the D+/D- lines or VBUS is detected
0 = No activity on the D+/D- lines or VBUS is detected
bit 3 SESVDIF: Session Valid Change Indicator bit
1 =VBUS has crossed VA_SESS_END (as defined in the “USB 2.0 OTG Specification”)(1)
0 =VBUS has not crossed VA_SESS_END
bit 2 SESENDIF: B-Device VBUS Change Indicator bit
1 =V
BUS change on B-device detected; VBUS has crossed VB_SESS_END
(as defined in the “USB 2.0 OTG Specification”)(1)
0 =VBUS has not crossed VA_SESS_END
bit 1 Unimplemented: Read as ‘0’
bit 0 VBUSVDIF: A-Device VBUS Change Indicator bit
1 =V
BUS change on A-device is detected; VBUS has crossed VA_VBUS_VLD
(as defined in the “USB 2.0 OTG Specification”)(1)
0 =No VBUS change on A-device is detected
Note 1: VBUS threshold crossings may be either rising or falling.
Note: Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits at the moment of the write to become cleared.
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DS39975A-page 260 2010 Microchip Technology Inc.
REGISTER 18-15: U1OTGIE: USB OTG INTERRUPT ENABLE REGISTER (HOST MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0
IDIE T1MSECIE LSTATEIE ACTVIE SESVDIE SESENDIE — VBUSVDIE
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 IDIE: ID Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 6 T1MSECIE: 1 Millisecond Timer Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 5 LSTATEIE: Line State Stable Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 4 ACTVIE: Bus Activity Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 3 SESVDIE: Session Valid Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 2 SESENDIE: B-Device Session End Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 1 Unimplemented: Read as ‘0’
bit 0 VBUSVDIE: A-Device VBUS Valid Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
2010 Microchip Technology Inc. DS39975A-page 261
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REGISTER 18-16: U1IR: USB INTERRUPT STATUS REGISTER (DEVICE MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/K-0, HS U-0 R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R-0 R/K-0, HS
STALLIF — RESUMEIF IDLEIF TRNIF SOFIF UERRIF URSTIF
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit K = Write ‘1’ to clear bit HS = Hardware Settable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 STALLIF: STALL Handshake Interrupt bit
1 = A STALL handshake was sent by the peripheral during the handshake phase of the transaction in
Device mode
0 = A STALL handshake has not been sent
bit 6 Unimplemented: Read as ‘0’
bit 5 RESUMEIF: Resume Interrupt bit
1 = A K-state is observed on the D+ or D- pin for 2.5 s (differential ‘1’ for low speed, differential ‘0’ for
full speed)
0 = No K-state is observed
bit 4 IDLEIF: Idle Detect Interrupt bit
1 = Idle condition is detected (constant Idle state of 3 ms or more)
0 = No Idle condition is detected
bit 3 TRNIF: Token Processing Complete Interrupt bit
1 = Processing of the current token is complete; read the U1STAT register for endpoint information
0 = Processing of the current token is not complete; clear the U1STAT register or load the next token
from STAT (clearing this bit causes the STAT FIFO to advance)
bit 2 SOFIF: Start-of-Frame Token Interrupt bit
1 = A Start-of-Frame token is received by the peripheral or the Start-of-Frame threshold is reached by
the host
0 = No Start-of-Frame token is received or threshold reached
bit 1 UERRIF: USB Error Condition Interrupt bit (read-only)
1 = An unmasked error condition has occurred; only error states enabled in the U1EIE register can set
this bit
0 = No unmasked error condition has occurred
bit 0 URSTIF: USB Reset Interrupt bit
1 = Valid USB Reset has occurred for at least 2.5 s; Reset state must be cleared before this bit can
be reasserted
0 = No USB Reset has occurred. Individual bits can only be cleared by writing a ‘1’ to the bit position
as part of a word write operation on the entire register. Using Boolean instructions or bitwise oper-
ations to write to a single bit position will cause all set bits at the moment of the write to become
cleared.
Note: Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits at the moment of the write to become cleared.
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DS39975A-page 262 2010 Microchip Technology Inc.
REGISTER 18-17: U1IR: USB INTERRUPT STATUS REGISTER (HOST MODE ONLY)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R-0 R/K-0, HS
STALLIF ATTACHIF RESUMEIF IDLEIF TRNIF SOFIF UERRIF DETACHIF
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit K = Write ‘1’ to clear bit HS = Hardware Settable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 STALLIF: STALL Handshake Interrupt bit
1 = A STALL handshake was sent by the peripheral device during the handshake phase of the
transaction in Device mode
0 = A STALL handshake has not been sent
bit 6 ATTACHIF: Peripheral Attach Interrupt bit
1 = A peripheral attachment has been detected by the module; it is set if the bus state is not SE0 and
there has been no bus activity for 2.5 s
0 = No peripheral attacement has been detected
bit 5 RESUMEIF: Resume Interrupt bit
1 = A K-state is observed on the D+ or D- pin for 2.5 s (differential ‘1’ for low speed, differential ‘0’ for
full speed)
0 = No K-state is observed
bit 4 IDLEIF: Idle Detect Interrupt bit
1 = Idle condition is detected (constant Idle state of 3 ms or more)
0 = No Idle condition is detected
bit 3 TRNIF: Token Processing Complete Interrupt bit
1 = Processing of the current token is complete; read the U1STAT register for endpoint information
0 = Processing of the current token not complete; clear the U1STAT register or load the next token
from U1STAT
bit 2 SOFIF: Start-of-Frame Token Interrupt bit
1 = A Start-of-Frame token received by the peripheral or the Start-of-Frame threshold reached by the host
0 = No Start-of-Frame token received or threshold reached
bit 1 UERRIF: USB Error Condition Interrupt bit
1 = An unmasked error condition has occurred; only error states enabled in the U1EIE register can set
this bit
0 = No unmasked error condition has occurred
bit 0 DETACHIF: Detach Interrupt bit
1 = A peripheral detachment has been detected by the module; Reset state must be cleared before
this bit can be reasserted
0 = No peripheral detachment is detected. Individual bits can only be cleared by writing a ‘1’ to the bit
position as part of a word write operation on the entire register. Using Boolean instructions or bit-
wise operations to write to a single bit position will cause all set bits at the moment of the write to
become cleared.
Note: Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits at the moment of the write to become cleared.
2010 Microchip Technology Inc. DS39975A-page 263
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REGISTER 18-18: U1IE: USB INTERRUPT ENABLE REGISTER (ALL USB MODES)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
STALLIE ATTACHIE(1) RESUMEIE IDLEIE TRNIE SOFIE UERRIE URSTIE
DETACHIE
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 STALLIE: STALL Handshake Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 6 ATTACHIE: Peripheral Attach Interrupt bit (Host mode only)(1)
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 5 RESUMEIE: Resume Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 4 IDLEIE: Idle Detect Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 3 TRNIE: Token Processing Complete Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 2 SOFIE: Start-of-Frame Token Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 1 UERRIE: USB Error Condition Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 0 URSTIE or DETACHIE: USB Reset Interrupt (Device mode) or USB Detach Interrupt (Host mode)
Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
Note 1: Unimplemented in Device mode, read as ‘0’.
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DS39975A-page 264 2010 Microchip Technology Inc.
REGISTER 18-19: U1EIR: USB ERROR INTERRUPT STATUS REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/K-0, HS U-0 R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS R/K-0, HS
BTSEF — DMAEF BTOEF DFN8EF CRC16EF CRC5EF PIDEF
EOFEF
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit K = Write ‘1’ to clear bit HS = Hardware Settable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 BTSEF: Bit Stuff Error Flag bit
1 = Bit stuff error has been detected
0 = No bit stuff error has been detected
bit 6 Unimplemented: Read as ‘0’
bit 5 DMAEF: DMA Error Flag bit
1 = A USB DMA error condition is detected; the data size indicated by the BD byte count field is less
than the number of received bytes, the received data is truncated
0 = No DMA error
bit 4 BTOEF: Bus Turnaround Time-out Error Flag bit
1 = Bus turnaround time-out has occurred
0 = No bus turnaround time-out
bit 3 DFN8EF: Data Field Size Error Flag bit
1 = Data field was not an integral number of bytes
0 = Data field was an integral number of bytes
bit 2 CRC16EF: CRC16 Failure Flag bit
1 = CRC16 failed
0 = CRC16 passed
bit 1 For Device mode:
CRC5EF: CRC5 Host Error Flag bit
1 = Token packet is rejected due to CRC5 error
0 = Token packet is accepted (no CRC5 error)
For Host mode:
EOFEF: End-of-Frame Error Flag bit
1 = End-of-Frame error has occurred
0 = End-of-Frame interrupt is disabled
bit 0 PIDEF: PID Check Failure Flag bit
1 = PID check failed
0 = PID check passed
Note: Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits at the moment of the write to become cleared.
2010 Microchip Technology Inc. DS39975A-page 265
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REGISTER 18-20: U1EIE: USB ERROR INTERRUPT ENABLE REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
BTSEE — DMAEE BTOEE DFN8EE CRC16EE CRC5EE PIDEE
EOFEE
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 BTSEE: Bit Stuff Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 6 Unimplemented: Read as ‘0’
bit 5 DMAEE: DMA Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 4 BTOEE: Bus Turnaround Time-out Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 3 DFN8EE: Data Field Size Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 2 CRC16EE: CRC16 Failure Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 1 For Device mode:
CRC5EE: CRC5 Host Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
For Host mode:
EOFEE: End-of-Frame Error interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 0 PIDEE: PID Check Failure Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
PIC24FJ256GB210 FAMILY
DS39975A-page 266 2010 Microchip Technology Inc.
18.7.3 USB ENDPOINT MANAGEMENT REGISTERS
REGISTER 18-21: U1EPn: USB ENDPOINT n CONTROL REGISTERS (n = 0 TO 15)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LSPD(1)
RETRYDIS
(1)
— EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7 LSPD: Low-Speed Direct Connection Enable bit (U1EP0 only)(1)
1 = Direct connection to a low-speed device is enabled
0 = Direct connection to a low-speed device is disabled
bit 6 RETRYDIS: Retry Disable bit (U1EP0 only)(1)
1 = Retry NAK transactions is disabled
0 = Retry NAK transactions is enabled; retry is done in hardware
bit 5 Unimplemented: Read as ‘0’
bit 4 EPCONDIS: Bidirectional Endpoint Control bit
If EPTXEN and EPRXEN = 1:
1 = Disable Endpoint n from control transfers; only TX and RX transfers are allowed
0 = Enable Endpoint n for control (SETUP) transfers; TX and RX transfers are also allowed
For all other combinations of EPTXEN and EPRXEN:
This bit is ignored.
bit 3 EPRXEN: Endpoint Receive Enable bit
1 = Endpoint n receive is enabled
0 = Endpoint n receive is disabled
bit 2 EPTXEN: Endpoint Transmit Enable bit
1 = Endpoint n transmit is enabled
0 = Endpoint n transmit is disabled
bit 1 EPSTALL: Endpoint Stall Status bit
1 = Endpoint n was stalled
0 = Endpoint n was not stalled
bit 0 EPHSHK: Endpoint Handshake Enable bit
1 = Endpoint handshake is enabled
0 = Endpoint handshake is disabled (typically used for isochronous endpoints)
Note 1: These bits are available only for U1EP0 and only in Host mode. For all other U1EPn registers, these bits
are always unimplemented and read as ‘0’.
2010 Microchip Technology Inc. DS39975A-page 267
PIC24FJ256GB210 FAMILY
18.7.4 USB VBUS POWER CONTROL REGISTER
REGISTER 18-22: U1PWMCON: USB VBUS PWM GENERATOR CONTROL REGISTER
R/W-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0
PWMEN — — — — — PWMPOL CNTEN
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 PWMEN: PWM Enable bit
1 = PWM generator is enabled
0 = PWM generator is disabled; output is held in the Reset state specified by PWMPOL
bit 14-10 Unimplemented: Read as ‘0’
bit 9 PWMPOL: PWM Polarity bit
1 = PWM output is active-low and resets high
0 = PWM output is active-high and resets low
bit 8 CNTEN: PWM Counter Enable bit
1 = Counter is enabled
0 = Counter is disabled
bit 7-0 Unimplemented: Read as ‘0’
PIC24FJ256GB210 FAMILY
DS39975A-page 268 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 269
PIC24FJ256GB210 FAMILY
19.0 ENHANCED PARALLEL
MASTER PORT (EPMP)
The Enhanced Parallel Master Port (EPMP) module
provides a parallel 4-bit (Master mode only), 8-bit (Mas-
ter and Slave modes) or 16-bit (Master mode only) data
bus interface to communicate with off-chip modules,
such as memories, FIFOs, LCD controllers and other
microcontrollers. This module can serve as either the
master or the slave on the communication bus. For
EPMP Master modes, all external addresses are
mapped into the internal Extended Data Space (EDS).
This is done by allocating a region of the EDS for each
chip select, and then assigning each chip select to a
particular external resource, such as a memory or
external controller. This region should not be assigned
to another device resource, such as RAM or SFRs. To
perform a write or read on an external resource, the
CPU should simply perform a write or read within the
address range assigned for EPMP.
Key features of the EPMP module are:
• Extended Data Space (EDS) Interface allows
Direct Access from the CPU
• Up to 23 Programmable Address Lines
• Up to 2 Chip Select Lines
• Up to 2 Acknowledgement Lines (one per chip
select)
• 4-Bit, 8-Bit or 16-Bit Wide Data Bus
• Programmable Strobe Options (per chip select)
- Individual Read and Write Strobes or;
- Read/Write Strobe with Enable Strobe
• Programmable Address/Data Multiplexing
• Programmable Address Wait States
• Programmable Data Wait States (per chip select)
• Programmable Polarity on Control Signals (per
chip select)
• Legacy Parallel Slave Port Support
• Enhanced Parallel Slave Support
- Address Support
- 4-Byte Deep Auto-Incrementing Buffer
19.1 ALTPMP Setting
Many of the lower order EPMP address pins are shared
with ADC inputs. This is an untenable situation for
users that need both the ADC channels and the EPMP
bus. If the user does not need to use all the address
bits, then by clearing the ALTPMP (CW3<12>) Config-
uration bit, the lower order address bits can be mapped
to higher address pins, which frees the ADC channels.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 42. “Enhanced Parallel Master
Port (EPMP)” (DS39730). The informa-
tion in this data sheet supersedes the
information in the FRM.
Note: The alternate PMP pin selection is not
available in 64-pin devices
(PIC24FJXXXGB206) and so the
Configuration bit, ALTPMP, is also not
available.
TABLE 19-1: ALTERNATE EPMP PINS(1)
Pin ALTPMP = 0ALTPMP = 1
RA14 PMCS2 PMA22
RC4 PMA22 PMCS2
RF12 PMA5 PMA18
RG6 PMA18 PMA5
RG7 PMA20 PMA4
RA3 PMA4 PMA20
RG8 PMA21 PMA3
RA4 PMA3 PMA21
Note 1: The alternate EPMP pins are valid only for 100-pin devices (PIC24FJXXXGB210).
PIC24FJ256GB210 FAMILY
DS39975A-page 270 2010 Microchip Technology Inc.
TABLE 19-2: PARALLEL MASTER PORT PIN DESCRIPTION
Pin Name Type Description
PMA<22:16>(1) O Address Bus Bits<22-16>
PMA<15>, PMCS2
O Address Bus Bit<15>
O Chip Select 2 (alternate location)
I/O Data Bus Bit<15> when port size is 16 bits and address is
multiplexed
PMA<14>, PMCS1
O Address Bus Bit<14>
O Chip Select 1 (alternate location)
I/O Data Bus Bit<14> when port size is 16-bit and address is
multiplexed
PMA<13:8>
O Address Bus Bits<13-8>
I/O Data Bus Bits<13-8> when port size is 16 bits and address
is multiplexed
PMA<7:3> O Address Bus Bits<7-3>
PMA<2>, PMALU(1) O Address Bus Bit<2>
O Address latch upper strobe for multiplexed address
PMA<1>, PMALH I/O Address Bus Bit<1>
O Address latch high strobe for multiplexed address
PMA<0>, PMALL I/O Address Bus Bit<0>
O Address latch low strobe for multiplexed address
PMD<15:8> I/O Data Bus Bits<15-8> when address is not multiplexed
PMD<7:4>
I/O Data Bus Bits<7-4>
O Address Bus Bits<7-4> when port size is 4 bits and address
is multiplexed with 1 address phase
PMD<3:0> I/O Data Bus Bits<3-0>
PMCS1 I/O Chip Select 1
PMCS2 O Chip Select 2
PMWR, PMENB I/O Write strobe or enable signal depending on Strobe mode
PMRD, PMRD/PMWR I/O Read strobe or Read/Write signal depending on Strobe
mode
PMBE1(1) O Byte indicator
PMBE0 O Nibble or byte indicator
PMACK1 I Acknowledgment 1
PMACK2 I Acknowledgment 2
Note 1: Available only in 100-pin devices (PIC24FJXXXGB210).
2010 Microchip Technology Inc. DS39975A-page 271
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REGISTER 19-1: PMCON1: EPMP CONTROL REGISTER 1
R/W-0 U-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0
PMPEN — PSIDL ADRMUX1 ADRMUX0 —MODE1MODE0
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0
CSF1 CSF0 ALP ALMODE — BUSKEEP IRQM1 IRQM0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 PMPEN: Parallel Master Port Enable bit
1 = EPMP is enabled
0 = EPMP is disabled
bit 14 Unimplemented: Read as ‘0’
bit 13 PSIDL: Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12-11 ADRMUX<1:0>: Address/Data Multiplexing Selection bits
11 = Lower address bits are multiplexed with data bits using 3 address phases
10 = Lower address bits are multiplexed with data bits using 2 address phases
01 = Lower address bits are multiplexed with data bits using 1 address phase
00 = Address and data appear on separate pins
bit 10 Unimplemented: Read as ‘0’
bit 9-8 MODE<1:0>: Parallel Port Mode Select bits
11 = Master mode
10 = Enhanced PSP; pins used are PMRD, PMWR, PMCS, PMD<7:0> and PMA<1:0>
01 = Buffered PSP; pins used are PMRD, PMWR, PMCS and PMD<7:0>
00 = Legacy Parallel Slave Port; PMRD, PMWR, PMCS and PMD<7:0> pins are used
bit 7-6 CSF<1:0>: Chip Select Function bits
11 = Reserved
10 = PMA<15> used for Chip Select 2, PMA<14> used for Chip Select 1
01 = PMA<15> used for Chip Select 2, PMCS1 used for Chip Select 1
00 = PMCS2 used for Chip Select 2, PMCS1 used for Chip Select 1
bit 5 ALP: Address Latch Polarity bit
1 = Active-high (PMALL, PMALH and PMALU)
0 = Active-low (PMALL, PMALH and PMALU)
bit 4 ALMODE: Address Latch Strobe Mode bit
1 = Enable “smart” address strobes (each address phase is only present if the current access would
cause a different address in the latch than the previous address)
0 = Disable “smart” address strobes
bit 3 Unimplemented: Read as ‘0’
bit 2 BUSKEEP: Bus Keeper bit
1 = Data bus keeps its last value when not actively being driven
0 = Data bus is in high-impedance state when not actively being driven
bit 1-0 IRQM<1:0>: Interrupt Request Mode bits
11 = Interrupt generated when Read Buffer 3 is read or Write Buffer 3 is written (Buffered PSP mode),
or on a read or write operation when PMA<1:0> = 11 (Addressable PSP mode only)
10 = Reserved
01 = Interrupt generated at the end of a read/write cycle
00 = No interrupt is generated
PIC24FJ256GB210 FAMILY
DS39975A-page 272 2010 Microchip Technology Inc.
REGISTER 19-2: PMCON2: EPMP CONTROL REGISTER 2
R-0, HSC U-0 R/C-0, HS R/C-0, HS U-0 U-0 U-0 U-0
BUSY —ERROR TIMEOUT — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
RADDR23 RADDR22 RADDR21 RADDR20 RADDR19 RADDR18 RADDR17 RADDR16
bit 7 bit 0
Legend: HS = Hardware Settable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ C = Clearable bit
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 BUSY: Busy bit (Master mode only)
1 = Port is busy
0 = Port is not busy
bit 14 Unimplemented: Read as ‘0’
bit 13 ERROR: Error bit
1 = Transaction error (illegal transaction was requested)
0 = Transaction completed successfully
bit 12 TIMEOUT: Time-Out bit
1 = Transaction timed out
0 = Transaction completed successfully
bit 11-8 Unimplemented: Read as ‘0’
bit 7-0 RADDR<23:16>: Parallel Master Port Reserved Address Space bits(1)
Note 1: If RADDR<23:16> = 00000000, then the last EDS address for Chip Select 2 will be 0xFFFFFF.
2010 Microchip Technology Inc. DS39975A-page 273
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REGISTER 19-3: PMCON3: EPMP CONTROL REGISTER 3
R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0
PTWREN PTRDEN PTBE1EN PTBE0EN — AWAITM1 AWAITM0 AWAITE
bit 15 bit 8
U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
—PTEN22
(1) PTEN21(1) PTEN20(1) PTEN19(1) PTEN18(1) PTEN17(1) PTEN16(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 PTWREN: Write/Enable Strobe Port Enable bit
1 = PMWR/PMENB port is enabled
0 = PMWR/PMENB port is disabled
bit 14 PTRDEN: Read/Write Strobe Port Enable bit
1 =PMRD/PMWR
port is enabled
0 =PMRD/PMWR
port is disabled
bit 13 PTBE1EN: High Nibble/Byte Enable Port Enable bit
1 = PMBE1 port is enabled
0 = PMBE1 port is disabled
bit 12 PTBE0EN: Low Nibble/Byte Enable Port Enable bit
1 = PMBE0 port is enabled
0 = PMBE0 port is disabled
bit 11 Unimplemented: Read as ‘0’
bit 10-9 AWAITM<1:0>: Address Latch Strobe Wait States bits
11 = Wait of 3½ TCY
10 = Wait of 2½ TCY
01 = Wait of 1½ TCY
00 = Wait of ½ TCY
bit bit 8 AWAITE: Address Hold After Address Latch Strobe Wait States bits
1 = Wait of 1¼ TCY
0 = Wait of ¼ TCY
bit 7 Unimplemented: Read as ‘0’
bit 6-0 PTEN<22:16>: EPMP Address Port Enable bits(1)
1 = PMA<22:16> function as EPMP address lines
0 = PMA<22:16> function as port I/Os
Note 1: Not available on 64-pin devices (PIC24FJXXXGB206).
PIC24FJ256GB210 FAMILY
DS39975A-page 274 2010 Microchip Technology Inc.
REGISTER 19-4: PMCON4: EPMP CONTROL REGISTER 4
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
PTEN15 PTEN14 PTEN13 PTEN12 PTEN11 PTEN10 PTEN9 PTEN8
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
PTEN7 PTEN6 PTEN5 PTEN4 PTEN3 PTEN2 PTEN1 PTEN0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 PTEN15: PMA15 Port Enable bit
1 = PMA15 functions as either Address Line 15 or Chip Select 2
0 = PMA15 functions as port I/O
bit 14 PTEN14: PMA14 Port Enable bit
1 = PMA14 functions as either Address Line 14 or Chip Select 1
0 = PMA14 functions as port I/O
bit 13-3 PTEN<13:3>: EPMP Address Port Enable bits
1 = PMA<13:3> function as EPMP address lines
0 = PMA<13:3> function as port I/Os
bit 2-0 PTEN<2:0>: PMALU/PMALH/PMALL Strobe Enable bits
1 = PMA<2:0> function as either address lines or address latch strobes
0 = PMA<2:0> function as port I/Os
2010 Microchip Technology Inc. DS39975A-page 275
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REGISTER 19-5: PMCSxCF: CHIP SELECT x CONFIGURATION REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0
CSDIS CSP CSPTEN BEP — WRSP RDSP SM
bit 15 bit 8
R/W-0 R/W-0 R/W-0 U-0 U-0 U-0 U-0 U-0
ACKP PTSZ1 PTSZ0 — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CSDIS: Chip Select x Disable bit
1 = Disable the Chip Select x functionality
0 = Enable the Chip Select x functionality
bit 14 CSP: Chip Select x Polarity bit
1 = Active-high (PMCSx)
0 =Active-low (PMCSx
)
bit 13 CSPTEN: PMCSx Port Enable bit
1 = PMCSx port is enabled
0 = PMCSx port is disabled
bit 12 BEP: Chip Select x Nibble/Byte Enable Polarity bit
1 = Nibble/Byte enable is active-high (PMBE0, PMBE1)
0 = Nibble/Byte enable is active-low (PMBE0, PMBE1)
bit 11 Unimplemented: Read as ‘0’
bit 10 WRSP: Chip Select x Write Strobe Polarity bit
For Slave modes and Master mode when SM = 0:
1 = Write strobe is active-high (PMWR)
0 = Write strobe is active-low (PMWR)
For Master mode when SM = 1:
1 = Enable strobe is active-high (PMENB)
0 = Enable strobe is active-low (PMENB)
bit 9 RDSP: Chip Select x Read Strobe Polarity bit
For Slave modes and Master mode when SM = 0:
1 = Read strobe is active-high (PMRD)
0 = Read strobe is active-low (PMRD)
For Master mode when SM = 1:
1 = Read/write strobe is active-high (PMRD/PMWR)
0 = Read/Write strobe is active-low (PMRD/PMWR)
bit 8 SM: Chip Select x Strobe Mode bit
1 = Read/Write and enable strobes (PMRD/PMWR and PMENB)
0 = Read and write strobes (PMRD and PMWR)
bit 7 ACKP: Chip Select x Acknowledge Polarity bit
1 = ACK is active-high (PMACK1)
0 = ACK is active-low (PMACK1)
bit 6-5 PTSZ<1:0>: Chip Select x Port Size bits
11 =Reserved
10 = 16-bit port size (PMD<15:0>)
01 = 4-bit port size (PMD<3:0>)
00 = 8-bit port size (PMD<7:0>)
bit 4-0 Unimplemented: Read as ‘0’
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DS39975A-page 276 2010 Microchip Technology Inc.
REGISTER 19-6: PMCSxBS: CHIP SELECT x BASE ADDRESS REGISTER
R/W(1) R/W(1) R/W(1) R/W(1) R/W(1) R/W(1) R/W(1) R/W(1)
BASE23 BASE22 BASE21 BASE20 BASE19 BASE18 BASE17 BASE16
bit 15 bit 8
R/W(1) U-0 U-0 U-0 R/W(1) U-0 U-0 U-0
BASE15 — — — BASE11 ———
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-7 BASE<23:15>: Chip Select x Base Address bits(2)
bit 6-4 Unimplemented: Read as ‘0’
bit 3 BASE<11>: Chip Select x Base Address bits(2)
bit 2-0 Unimplemented: Read as ‘0’
Note 1: Value at POR is 0x0200 for PMCS1BS and 0x0600 for PMCS2BS.
2: If the whole PMCS2BS register is written together as 0x0000, then the last EDS address for the Chip
Select 1 will be 0xFFFFFF. In this case, the Chip Select 2 should not be used. PMCS1BS has no such
feature.
2010 Microchip Technology Inc. DS39975A-page 277
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REGISTER 19-7: PMCSxMD: CHIP SELECT x MODE REGISTER
R/W-0 R/W-0 U-0 U-0 U-0 U-0 U-0 U-0
ACKM1 ACKM0 — — — — — —
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
DWAITB1 DWAITB0 DWAITM3 DWAITM2 DWAITM1 DWAITM0 DWAITE1 DWAITE0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-14 ACKM<1:0>: Chip Select x Acknowledge Mode bits
11 = Reserved
10 = PMACKx is used to determine when a read/write operation is complete
01 = PMACKx is used to determine when a read/write operation is complete with time-out
If DWAITM<3:0> = 0000, the maximum time-out is 255 T
CY, else it is DWAITM<3:0> cycles.
00 = PMACKx is not used
bit 13-8 Unimplemented: Read as ‘0’
bit 7-6 DWAITB<1:0>: Chip Select x Data Setup Before Read/Write Strobe Wait States bits
11 = Wait of 3¼ TCY
10 = Wait of 2¼ TCY
01 = Wait of 1¼ TCY
00 = Wait of ¼ TCY
bit 5-2 DWAITM<3:0>: Chip Select x Data Read/Write Strobe Wait States bits
For Write operations:
1111 = Wait of 15½ TCY
. . .
0001 = Wait of 1½ TCY
0000 = Wait of ½ TCY
For Read operations:
1111 = Wait of 15¾ TCY
. . .
0001 = Wait of 1¾ TCY
0000 = Wait of ¾ TCY
bit 1-0 DWAITE<1:0>: Chip Select x Data Hold After Read/Write Strobe Wait States bits
For Write operations:
11 = Wait of 3¼ TCY
10 = Wait of 2¼ TCY
01 = Wait of 1¼ TCY
00 = Wait of ¼ TCY
For Read operations:
11 = Wait of 3 TCY
10 = Wait of 2 TCY
01 = Wait of 1 TCY
00 = Wait of 0 TCY
PIC24FJ256GB210 FAMILY
DS39975A-page 278 2010 Microchip Technology Inc.
REGISTER 19-8: PMSTAT: EPMP STATUS REGISTER (SLAVE MODE ONLY)
R-0, HSC R/W-0 HS U-0 U-0 R-0, HSC R-0, HSC R-0, HSC R-0, HSC
IBF IBOV —— IB3F IB2F IB1F IB0F
bit 15 bit 8
R-1, HSC R/W-0 HS U-0 U-0 R-1, HSC R-1, HSC R-1, HSC R-1, HSC
OBE OBUF —— OB3E OB2E OB1E OB0E
bit 7 bit 0
Legend: HS = Hardware Settable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 IBF: Input Buffer Full Status bit
1 = All writable input buffer registers are full
0 = Some or all of the writable input buffer registers are empty
bit 14 IBOV: Input Buffer Overflow Status bit
1 = A write attempt to a full input register occurred (must be cleared in software)
0 = No overflow occurred
bit 13-12 Unimplemented: Read as ‘0’
bit 11-8 IBxF: Input Buffer x Status Full bit(1)
1 = Input buffer contains unread data (reading buffer will clear this bit)
0 = Input buffer does not contain unread data
bit 7 OBE: Output Buffer Empty Status bit
1 = All readable output buffer registers are empty
0 = Some or all of the readable output buffer registers are full
bit 6 OBUF: Output Buffer Underflow Status bit
1 = A read occurred from an empty output register (must be cleared in software)
0 = No underflow occurred
bit 5-4 Unimplemented: Read as ‘0’
bit 3-0 OBxE: Output Buffer x Status Empty bit
1 = Output buffer is empty (writing data to the buffer will clear this bit)
0 = Output buffer contains untransmitted data
Note 1: Even though an individual bit represents the byte in the buffer, the bits corresponding to the Word (Byte 0
and 1, or Byte 2 and 3) gets cleared even on byte reading.
2010 Microchip Technology Inc. DS39975A-page 279
PIC24FJ256GB210 FAMILY
REGISTER 19-9: PADCFG1: PAD CONFIGURATION CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0
— — — — — —
RTSECSEL
(1)
PMPTTL
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-2 Unimplemented: Read as ‘0’
bit 1 RTSECSEL: RTCC Seconds Clock Output Select bit(1)
1 = RTCC seconds clock is selected for the RTCC pin
0 = RTCC alarm pulse is selected for the RTCC pin
bit 0 PMPTTL: EPMP Module TTL Input Buffer Select bit
1 = EPMP module inputs (PMDx, PMCS1) use TTL input buffers
0 = EPMP module inputs use Schmitt Trigger input buffers
Note 1: To enable the actual RTCC output, the RTCOE (RCFGCAL<10>) bit must also be set.
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DS39975A-page 280 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 281
PIC24FJ256GB210 FAMILY
20.0 REAL-TIME CLOCK AND
CALENDAR (RTCC)
The Real-Time Clock and Calendar (RTCC) provides a
function that can be calibrated.
Key features of the RTCC module are:
• Operates in Sleep mode
• Provides hours, minutes and seconds using
24-hour format
• Visibility of half of one second period
• Provides calendar – weekday, date, month and
year
• Alarm configurable for half a second, one
second,10 seconds, one minute, 10 minutes, one
hour, one day, one week, one month or one year
• Alarm repeat with decrementing counter
• Alarm with indefinite repeat chime
• Years, 2000 to 2099, leap year correction
• BCD format for smaller software overhead
• Optimized for long-term battery operation
• User calibration of the 32.768 kHz clock
crystal/32K INTRC frequency with periodic
auto-adjust
- Calibration to within ±2.64 seconds error per
month
- Calibrates up to 260 ppm of crystal error
FIGURE 20-1: RTCC BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 29. “Real-Time Clock and
Calendar (RTCC)” (DS39696). The
information in this data sheet
supersedes the information in the FRM.
RTCC Prescalers
RTCC Timer
Comparator
Compare Registers
Repeat Counter
YEAR
MTHDY
WKDYHR
MINSEC
ALMTHDY
ALWDHR
ALMINSEC
with Masks
RTCC Interrupt Logic
RCFGCAL
ALCFGRPT
Alarm
Event
32.768 kHz Input
from SOSC
0.5s
RTCC Clock Domain
Alarm Pulse
RTCC Interrupt
CPU Clock Domain
RTCVAL
ALRMVAL
RTCC Pin
RTCOE
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DS39975A-page 282 2010 Microchip Technology Inc.
20.1 RTCC Module Registers
The RTCC module registers are organized into three
categories:
• RTCC Control Registers
• RTCC Value Registers
• Alarm Value Registers
20.1.1 REGISTER MAPPING
To limit the register interface, the RTCC Timer and
Alarm Time registers are accessed through the corre-
sponding register pointers. The RTCC Value register
window (RTCVALH and RTCVALL) uses the RTCPTR
bits (RCFGCAL<9:8>) to select the desired Timer
register pair (see Table 20-1).
By writing the RTCVALH byte, the RTCC Pointer value,
RTCPTR<1:0> bits, decrement by one until they reach
‘00’. Once they reach ‘00’, the MINUTES and
SECONDS value will be accessible through RTCVALH
and RTCVALL until the pointer value is manually
changed.
TABLE 20-1: RTCVAL REGISTER MAPPING
The Alarm Value register window (ALRMVALH and
ALRMVALL) uses the ALRMPTR bits (ALCFGRPT<9:8>)
to select the desired Alarm register pair (see Table 20-2).
By writing the ALRMVALH byte, the Alarm Pointer
value bits, ALRMPTR<1:0>, decrement by one until
they reach ‘00’. Once they reach ‘00’, the ALRMMIN
and ALRMSEC value will be accessible through
ALRMVALH and ALRMVALL until the pointer value is
manually changed.
TABLE 20-2: ALRMVAL REGISTER
MAPPING
Considering that the 16-bit core does not distinguish
between 8-bit and 16-bit read operations, the user must
be aware that when reading either the ALRMVALH or
ALRMVALL bytes, they will decrement the
ALRMPTR<1:0> value. The same applies to the
RTCVALH or RTCVALL bytes with the RTCPTR<1:0>
being decremented.
20.1.2 WRITE LOCK
In order to perform a write to any of the RTCC Timer
registers, the RTCWREN (RCFGCAL<13>) bit must be
set (refer to Example 20-1).
EXAMPLE 20-1: SETTING THE RTCWREN BIT
RTCPTR
<1:0>
RTCC Value Register Window
RTCVAL<15:8> RTCVAL<7:0>
00 MINUTES SECONDS
01 WEEKDAY HOURS
10 MONTH DAY
11 — YEAR
ALRMPTR
<1:0>
Alarm Value Register Window
ALRMVAL<15:8> ALRMVAL<7:0>
00 ALRMMIN ALRMSEC
01 ALRMWD ALRMHR
10 ALRMMNTH ALRMDAY
11 ——
Note: This only applies to read operations and
not write operations.
Note: To avoid accidental writes to the timer, it is
recommended that the RTCWREN bit
(RCFGCAL<13>) is kept clear at any
other time. For the RTCWREN bit to be
set, there is only 1 instruction cycle time
window allowed between the unlock
sequence and the setting of RTCWREN;
therefore, it is recommended that code
follow the procedure in Example 20-1.
For applications written in C, the unlock
sequence should be implemented using
in-line assembly.
asm volatile("disi #5");
asm volatile("mov #0x55, w7");
asm volatile("mov w7, _NVMKEY");
asm volatile("mov #0xAA, w8");
asm volatile("mov w8, _NVMKEY");
asm volatile("bset _RCFGCAL, #13"); //set the RTCWREN bit
2010 Microchip Technology Inc. DS39975A-page 283
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20.1.3 RTCC CONTROL REGISTERS
REGISTER 20-1: RCFGCAL: RTCC CALIBRATION AND CONFIGURATION REGISTER(1)
R/W-0 U-0 R/W-0 R-0, HSC R-0, HSC R/W-0 R/W-0, HSC R/W-0, HSC
RTCEN(2) — RTCWREN RTCSYNC HALFSEC(3) RTCOE RTCPTR1 RTCPTR0
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CAL7 CAL6 CAL5 CAL4 CAL3 CAL2 CAL1 CAL0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 RTCEN: RTCC Enable bit(2)
1 = RTCC module is enabled
0 = RTCC module is disabled
bit 14 Unimplemented: Read as ‘0’
bit 13 RTCWREN: RTCC Value Registers Write Enable bit
1 = RTCVALH and RTCVALL registers can be written to by the user
0 = RTCVALH and RTCVALL registers are locked out from being written to by the user
bit 12 RTCSYNC: RTCC Value Registers Read Synchronization bit
1 = RTCVALH, RTCVALL and ALCFGRPT registers can change while reading due to a rollover ripple
resulting in an invalid data read. If the register is read twice and results in the same data, the data
can be assumed to be valid.
0 = RTCVALH, RTCVALL or ALCFGRPT registers can be read without concern over a rollover ripple
bit 11 HALFSEC: Half-Second Status bit(3)
1 = Second half period of a second
0 = First half period of a second
bit 10 RTCOE: RTCC Output Enable bit
1 = RTCC output is enabled
0 = RTCC output is disabled
bit 9-8 RTCPTR<1:0>: RTCC Value Register Window Pointer bits
Points to the corresponding RTCC Value registers when reading the RTCVALH and RTCVALL registers.
The RTCPTR<1:0> value decrements on every read or write of RTCVALH until it reaches ‘00’.
RTCVAL<15:8>:
11 = Reserved
10 =MONTH
01 = WEEKDAY
00 = MINUTES
RTCVAL<7:0>:
11 =YEAR
10 =DAY
01 = HOURS
00 = SECONDS
Note 1: The RCFGCAL register is only affected by a POR.
2: A write to the RTCEN bit is only allowed when RTCWREN = 1.
3: This bit is read-only. It is cleared to ‘0’ on a write to the lower half of the MINSEC register.
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DS39975A-page 284 2010 Microchip Technology Inc.
bit 7-0 CAL<7:0>: RTC Drift Calibration bits
01111111 = Maximum positive adjustment; adds 508 RTC clock pulses every one minute
.
.
.
11111111 = Minimum negative adjustment; subtracts 4 RTC clock pulses every one minute
00000001 = Minimum positive adjustment; adds 4 RTC clock pulses every one minute
00000000 = No adjustment
.
.
.
10000000 = Maximum negative adjustment; subtracts 512 RTC clock pulses every one minute
REGISTER 20-1: RCFGCAL: RTCC CALIBRATION AND CONFIGURATION REGISTER(1)
Note 1: The RCFGCAL register is only affected by a POR.
2: A write to the RTCEN bit is only allowed when RTCWREN = 1.
3: This bit is read-only. It is cleared to ‘0’ on a write to the lower half of the MINSEC register.
REGISTER 20-2: PADCFG1: PAD CONFIGURATION CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0
— — — — — —
RTSECSEL
(1)
PMPTTL
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-2 Unimplemented: Read as ‘0’
bit 1 RTSECSEL: RTCC Seconds Clock Output Select bit(1)
1 = RTCC seconds clock is selected for the RTCC pin
0 = RTCC alarm pulse is selected for the RTCC pin
bit 0 PMPTTL: EPMP Module TTL Input Buffer Select bit
1 = EPMP module inputs (PMDx, PMCS1) use TTL input buffers
0 = EPMP module inputs use Schmitt Trigger input buffers
Note 1: To enable the actual RTCC output, the RTCOE (RCFGCAL<10>) bit must also be set.
2010 Microchip Technology Inc. DS39975A-page 285
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REGISTER 20-3: ALCFGRPT: ALARM CONFIGURATION REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0, HSC R/W-0, HSC
ALRMEN CHIME AMASK3 AMASK2 AMASK1 AMASK0 ALRMPTR1 ALRMPTR0
bit 15 bit 8
R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
ARPT7 ARPT6 ARPT5 ARPT4 ARPT3 ARPT2 ARPT1 ARPT0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 ALRMEN: Alarm Enable bit
1 = Alarm is enabled (cleared automatically after an alarm event whenever ARPT<7:0> = 00h and
CHIME = 0)
0 = Alarm is disabled
bit 14 CHIME: Chime Enable bit
1 = Chime is enabled; ARPT<7:0> bits are allowed to roll over from 00h to FFh
0 = Chime is disabled; ARPT<7:0> bits stop once they reach 00h
bit 13-10 AMASK<3:0>: Alarm Mask Configuration bits
11xx = Reserved – do not use
101x = Reserved – do not use
1001 = Once a year (except when configured for February 29th, once every 4 years)
1000 = Once a month
0111 = Once a week
0110 = Once a day
0101 = Every hour
0100 = Every 10 minutes
0011 = Every minute
0010 = Every 10 seconds
0001 = Every second
0000 = Every half second
bit 9-8 ALRMPTR<1:0>: Alarm Value Register Window Pointer bits
Points to the corresponding Alarm Value registers when reading the ALRMVALH and ALRMVALL registers.
The ALRMPTR<1:0> value decrements on every read or write of ALRMVALH until it reaches ‘00’.
ALRMVAL<15:8>:
11 = Unimplemented
10 =ALRMMNTH
01 =ALRMWD
00 = ALRMMIN
ALRMVAL<7:0>:
11 = Unimplemented
10 =ALRMDAY
01 =ALRMHR
00 = ALRMSEC
bit 7-0 ARPT<7:0>: Alarm Repeat Counter Value bits
11111111 = Alarm will repeat 255 more times
...
00000000 = Alarm will not repeat
The counter decrements on any alarm event. The counter is prevented from rolling over from 00h to FFh
unless CHIME = 1.
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20.1.4 RTCVAL REGISTER MAPPINGS
REGISTER 20-4: YEAR: YEAR VALUE REGISTER(1)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
YRTEN3 YRTEN2 YRTEN1 YRTEN0 YRONE3 YRONE2 YRONE1 YRONE0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-8 Unimplemented: Read as ‘0’
bit 7-4 YRTEN<3:0>: Binary Coded Decimal Value of Year’s Tens Digit bits
Contains a value from 0 to 9.
bit 3-0 YRONE<3:0>: Binary Coded Decimal Value of Year’s Ones Digit bits
Contains a value from 0 to 9.
Note 1: A write to the YEAR register is only allowed when RTCWREN = 1.
REGISTER 20-5: MTHDY: MONTH AND DAY VALUE REGISTER(1)
U-0 U-0 U-0 R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
— — —
MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
bit 15 bit 8
U-0 U-0 R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
— —
DAYTEN1 DAYTEN0 DAYONE3 DAYONE2 DAYONE1 DAYONE0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13 Unimplemented: Read as ‘0’
bit 12 MTHTEN0: Binary Coded Decimal Value of Month’s Tens Digit bit
Contains a value of 0 or 1.
bit 11-8 MTHONE<3:0>: Binary Coded Decimal Value of Month’s Ones Digit bits
Contains a value from 0 to 9.
bit 7-6 Unimplemented: Read as ‘0’
bit 5-4 DAYTEN<1:0>: Binary Coded Decimal Value of Day’s Tens Digit bits
Contains a value from 0 to 3.
bit 3-0 DAYONE<3:0>: Binary Coded Decimal Value of Day’s Ones Digit bits
Contains a value from 0 to 9.
Note 1: A write to this register is only allowed when RTCWREN = 1.
2010 Microchip Technology Inc. DS39975A-page 287
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REGISTER 20-6: WKDYHR: WEEKDAY AND HOURS VALUE REGISTER(1)
U-0 U-0 U-0 U-0 U-0 R/W-x, HSC R/W-x, HSC R/W-x, HSC
— — — — — WDAY2 WDAY1 WDAY0
bit 15 bit 8
U-0 U-0 R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
—— HRTEN1 HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-11 Unimplemented: Read as ‘0’
bit 10-8 WDAY<2:0>: Binary Coded Decimal Value of Weekday Digit bits
Contains a value from 0 to 6.
bit 7-6 Unimplemented: Read as ‘0’
bit 5-4 HRTEN<1:0>: Binary Coded Decimal Value of Hour’s Tens Digit bits
Contains a value from 0 to 2.
bit 3-0 HRONE<3:0>: Binary Coded Decimal Value of Hour’s Ones Digit bits
Contains a value from 0 to 9.
Note 1: A write to this register is only allowed when RTCWREN = 1.
REGISTER 20-7: MINSEC: MINUTES AND SECONDS VALUE REGISTER
U-0 R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
— MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
bit 15 bit 8
U-0 R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC R/W-x, HSC
— SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 MINTEN<2:0>: Binary Coded Decimal Value of Minute’s Tens Digit bits
Contains a value from 0 to 5.
bit 11-8 MINONE<3:0>: Binary Coded Decimal Value of Minute’s Ones Digit bits
Contains a value from 0 to 9.
bit 7 Unimplemented: Read as ‘0’
bit 6-4 SECTEN<2:0>: Binary Coded Decimal Value of Second’s Tens Digit bits
Contains a value from 0 to 5.
bit 3-0 SECONE<3:0>: Binary Coded Decimal Value of Second’s Ones Digit bits
Contains a value from 0 to 9.
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20.1.5 ALRMVAL REGISTER MAPPINGS
REGISTER 20-8: ALMTHDY: ALARM MONTH AND DAY VALUE REGISTER(1)
U-0 U-0 U-0 R/W-x R/W-x R/W-x R/W-x R/W-x
— — —
MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
bit 15 bit 8
U-0 U-0 R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x
— —
DAYTEN1 DAYTEN0 DAYONE3 DAYONE2 DAYONE1 DAYONE0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13 Unimplemented: Read as ‘0’
bit 12 MTHTEN0: Binary Coded Decimal Value of Month’s Tens Digit bit
Contains a value of 0 or 1.
bit 11-8 MTHONE<3:0>: Binary Coded Decimal Value of Month’s Ones Digit bits
Contains a value from 0 to 9.
bit 7-6 Unimplemented: Read as ‘0’
bit 5-4 DAYTEN<1:0>: Binary Coded Decimal Value of Day’s Tens Digit bits
Contains a value from 0 to 3.
bit 3-0 DAYONE<3:0>: Binary Coded Decimal Value of Day’s Ones Digit bits
Contains a value from 0 to 9.
Note 1: A write to this register is only allowed when RTCWREN = 1.
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REGISTER 20-9: ALWDHR: ALARM WEEKDAY AND HOURS VALUE REGISTER(1)
U-0 U-0 U-0 U-0 U-0 R/W-x R/W-x R/W-x
— — — — — WDAY2 WDAY1 WDAY0
bit 15 bit 8
U-0 U-0 R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x
—— HRTEN1 HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-11 Unimplemented: Read as ‘0’
bit 10-8 WDAY<2:0>: Binary Coded Decimal Value of Weekday Digit bits
Contains a value from 0 to 6.
bit 7-6 Unimplemented: Read as ‘0’
bit 5-4 HRTEN<1:0>: Binary Coded Decimal Value of Hour’s Tens Digit bits
Contains a value from 0 to 2.
bit 3-0 HRONE<3:0>: Binary Coded Decimal Value of Hour’s Ones Digit bits
Contains a value from 0 to 9.
Note 1: A write to this register is only allowed when RTCWREN = 1.
REGISTER 20-10: ALMINSEC: ALARM MINUTES AND SECONDS VALUE REGISTER
U-0 R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x
— MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
bit 15 bit 8
U-0 R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x
— SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 Unimplemented: Read as ‘0’
bit 14-12 MINTEN<2:0>: Binary Coded Decimal Value of Minute’s Tens Digit bits
Contains a value from 0 to 5.
bit 11-8 MINONE<3:0>: Binary Coded Decimal Value of Minute’s Ones Digit bits
Contains a value from 0 to 9.
bit 7 Unimplemented: Read as ‘0’
bit 6-4 SECTEN<2:0>: Binary Coded Decimal Value of Second’s Tens Digit bits
Contains a value from 0 to 5.
bit 3-0 SECONE<3:0>: Binary Coded Decimal Value of Second’s Ones Digit bits
Contains a value from 0 to 9.
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DS39975A-page 290 2010 Microchip Technology Inc.
20.2 Calibration
The real-time crystal input can be calibrated using the
periodic auto-adjust feature. When properly calibrated,
the RTCC can provide an error of less than 3 seconds
per month. This is accomplished by finding the number
of error clock pulses for one minute and storing the
value into the lower half of the RCFGCAL register. The
8-bit signed value loaded into the lower half of
RCFGCAL is multiplied by four and will either be added
or subtracted from the RTCC timer, once every minute.
Refer to the following steps for RTCC calibration:
1. Using another timer resource on the device, the
user must find the error of the 32.768 kHz
crystal.
2. Once the error is known, it must be converted to
the number of error clock pulses per minute and
loaded into the RCFGCAL register.
EQUATION 20-1: RTCC CALIBRATION
3. a) If the oscillator is faster then ideal (negative
result form Step 2), the RCFGCAL register value
needs to be negative. This causes the specified
number of clock pulses to be subtracted from
the timer counter, once every minute.
b) If the oscillator is slower then ideal (positive
result from Step 2), the RCFGCAL register value
needs to be positive. This causes the specified
number of clock pulses to be added to the timer
counter, once every minute.
4. Divide the number of error clocks per minute by
4 to get the correct CAL value and load the
RCFGCAL register with the correct value.
(Each 1-bit increment in CAL adds or subtracts
4 pulses).
Writes to the lower half of the RCFGCAL register
should only occur when the timer is turned off or
immediately after the rising edge of the seconds pulse.
20.3 Alarm
• Configurable from half second to one year
• Enabled using the ALRMEN bit
(ALCFGRPT<15>, Register 20-3)
• One-time alarm and repeat alarm options
available
20.3.1 CONFIGURING THE ALARM
The alarm feature is enabled using the ALRMEN bit.
This bit is cleared when an alarm is issued. Writes to
ALRMVAL should only take place when ALRMEN = 0.
As shown in Figure 20-2, the interval selection of the
alarm is configured through the AMASK bits
(ALCFGRPT<13:10>). These bits determine which and
how many digits of the alarm must match the clock
value for the alarm to occur.
The alarm can also be configured to repeat based on a
preconfigured interval. The amount of times this
occurs, once the alarm is enabled, is stored in the
ARPT bits, ARPT<7:0> (ALCFGRPT<7:0>). When the
value of the ARPT bits equals 00h and the CHIME bit
(ALCFGRPT<14>) is cleared, the repeat function is
disabled and only a single alarm will occur. The alarm
can be repeated up to 255 times by loading
ARPT<7:0> with FFh.
After each alarm is issued, the value of the ARPT bits
is decremented by one. Once the value has reached
00h, the alarm will be issued one last time, after which
the ALRMEN bit will be cleared automatically and the
alarm will turn off.
Indefinite repetition of the alarm can occur if the CHIME
bit = 1. Instead of the alarm being disabled when the
value of the ARPT bits reaches 00h, it rolls over to FFh
and continues counting indefinitely while CHIME is set.
20.3.2 ALARM INTERRUPT
At every alarm event, an interrupt is generated. In addi-
tion, an alarm pulse output is provided that operates at
half the frequency of the alarm. This output is
completely synchronous to the RTCC clock and can be
used as a trigger clock to other peripherals.
Note: It is up to the user to include in the error
value the initial error of the crystal, drift
due to temperature and drift due to crystal
aging.
Error (clocks per minute) = (Ideal Frequency† –
Measured Frequency) x 60
†Ideal Frequency = 32,768H
Note: Changing any of the registers, other then
the RCFGCAL and ALCFGRPT registers
and the CHIME bit while the alarm is
enabled (ALRMEN = 1), can result in a
false alarm event leading to a false alarm
interrupt. To avoid a false alarm event, the
timer and alarm values should only be
changed while the alarm is disabled
(ALRMEN = 0). It is recommended that the
ALCFGRPT register and CHIME bit be
changed when RTCSYNC = 0.
2010 Microchip Technology Inc. DS39975A-page 291
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FIGURE 20-2: ALARM MASK SETTINGS
Note 1: Annually, except when configured for February 29.
s
ss
mss
mm s s
hh mm ss
dhhmmss
dd hh mm s s
mm d d h h mm s s
Day of
the
Week Month Day Hours Minutes Seconds
Alarm Mask Setting
(AMASK<3:0>)
0000 – Every half second
0001 – Every second
0010 – Every 10 seconds
0011 – Every minute
0100 – Every 10 minutes
0101 – Every hour
0110 – Every day
0111 – Every week
1000 – Every month
1001 – Every year(1)
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DS39975A-page 292 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 293
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21.0 32-BIT PROGRAMMABLE
CYCLIC REDUNDANCY CHECK
(CRC) GENERATOR
The 32-bit programmable CRC generator provides a
hardware implemented method of quickly generating
checksums for various networking and security
applications. It offers the following features:
• User-programmable CRC polynomial equation,
up to 32 bits
• Programmable shift direction (little or big-endian)
• Independent data and polynomial lengths
• Configurable interrupt output
• Data FIFO
Figure 21-1 displays a simplified block diagram of the
CRC generator. A simple version of the CRC shift
engine is displayed in Figure 21-2.
FIGURE 21-1: CRC BLOCK DIAGRAM
FIGURE 21-2: CRC SHIFT ENGINE DETAIL
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 41. “32-Bit Programmable
Cyclic Redundancy Check (CRC)”
(DS39729). The information in this data
sheet supersedes the information in the
FRM.
CRC
Interrupt
Variable FIFO
(4x32, 8x16 or 16x8)
CRCDATH CRCDATL
Shift Buffer
CRC Shift Engine
CRCWDATH CRCWDATL
Shifter Clock
2 * FCY
LENDIAN
1
0
CRCISEL
1
0
FIFO Empty
Event
Shift
Complete
Event
Note 1: n = PLEN<4:1> + 1.
CRC Shift Engine CRCWDATH CRCWDATL
Bit 0 Bit 1 Bit n(1)
X0 X1 Xn(1)
Read/Write Bus
Shift Buffer
Data
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DS39975A-page 294 2010 Microchip Technology Inc.
21.1 User Interface
21.1.1 POLYNOMIAL INTERFACE
The CRC module can be programmed for CRC
polynomials of up of up the 32nd order, using up to 32 bits.
Polynomial length, which reflects the highest exponent
in the equation, is selected by the PLEN<4:0> bits
(CRCCON2<4:0>).
The CRCXORL and CRCXORH registers control which
exponent terms are included in the equation. Setting a
particular bit includes that exponent term in the equa-
tion; functionally, this includes an XOR operation on the
corresponding bit in the CRC engine. Clearing the bit
disables the XOR.
For example, consider two CRC polynomials, one a
16-bit and the other a 32-bit equation.
EQUATION 21-1: 16-BIT, 32-BIT CRC
POLYNOMIALS
To program these polynomials into the CRC generator,
set the register bits as shown in Table 21-1.
Note that the appropriate positions are set to ‘1’ to indi-
cate they are used in the equation (for example, X26
and X23). The ‘0’ bit required by the equation is always
XORed; thus, X0 is a don’t care. For a polynomial of
length 32, it is assumed that the 32nd bit will be used.
Therefore, the X<31:1> bits do not have the 32nd bit.
21.1.2 DATA INTERFACE
The module incorporates a FIFO that works with a vari-
able data width. Input data width can be configured to
any value between one and 32 bits using the
DWIDTH<4:0> bits (CRCCON2<12:8>). When the
data width is greater than 15, the FIFO is four words
deep. When the DWITDH bits are between 15 and 8,
the FIFO is 8 words deep. When the DWIDTH bits are
less than 8, the FIFO is 16 words deep.
The data for which the CRC is to be calculated must
first be written into the FIFO. Even if the data width is
less than 8, the smallest data element that can be writ-
ten into the FIFO is one byte. For example, if DWIDTH
is five, then the size of the data is DWIDTH + 1 or six.
The data is written as a whole byte; the two unused
upper bits are ignored by the module.
Once data is written into the MSb of the CRCDAT reg-
isters (that is, MSb as defined by the data width), the
value of the VWORD<4:0> bits (CRCCON1<12:8>)
increments by one. For example, if DWIDTH is 24, the
VWORD bits will increment when bit 7 of CRCDATH is
written. Therefore, CRCDATL must always be written
to before CRCDATH.
The CRC engine starts shifting data when the CRCGO
bit is set and the value of VWORD is greater than zero.
Each word is copied out of the FIFO into a buffer regis-
ter, which decrements VWORD. The data is then
shifted out of the buffer. The CRC engine continues
shifting at a rate of two bits per instruction cycle, until
VWORD reaches zero. This means that for a given
data width, it takes half that number of instructions for
each word to complete the calculation. For example, it
takes 16 cycles to calculate the CRC for a single word
of 32-bit data.
When VWORD reaches the maximum value for the
configured value of DWIDTH (4, 8 or 16), the CRCFUL
bit becomes set. When VWORD reaches zero, the
CRCMPT bit becomes set. The FIFO is emptied and
the VWORD<4:0> bits are set to ‘00000’ whenever
CRCEN is ‘0’.
At least one instruction cycle must pass after a write to
CRCWDAT before a read of the VWORD bits is done.
and
X32+X26 + X23 + X22 + X16 + X12 + X11 + X10 +
X8 + X7 + X5 + X4 + X2 + X + 1
X16 + X12 + X5 + 1
TABLE 21-1: CRC SETUP EXAMPLES FOR 16 AND 32-BIT POLYNOMIALS
CRC Control Bits
Bit Values
16-Bit Polynomial 32-Bit Polynomial
PLEN<4:0> 01111 11111
X<31:16> 0000 0000 0000 0001 0000 0100 1100 0001
X<15:0> 0001 0000 0010 000X 0001 1101 1011 011x
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21.1.3 DATA SHIFT DIRECTION
The LENDIAN bit (CRCCON1<3>) is used to control
the shift direction. By default, the CRC will shift data
through the engine, MSb first. Setting LENDIAN (= 1)
causes the CRC to shift data, LSb first. This setting
allows better integration with various communication
schemes and removes the overhead of reversing the
bit order in software. Note that this only changes the
direction the data is shifted into the engine. The result
of the CRC calculation will still be a normal CRC result,
not a reverse CRC result.
21.1.4 INTERRUPT OPERATION
The module generates an interrupt that is configurable
by the user for either of two conditions.
If CRCISEL is ‘0’, an interrupt is generated when the
VWORD<4:0> bits make a transition from a value of ‘1’
to ‘0’. If CRCISEL is ‘1’, an interrupt will be generated
after the CRC operation finishes and the module sets
the CRCGO bit to ‘0’. Manually setting CRCGO to ‘0’
will not generate an interrupt. Note that when an
interrupt occurs, the CRC calculation would not yet be
complete. The module will still need (PLEN + 1)/2 clock
cycles after the interrupt is generated until the CRC
calculation is finished.
21.1.5 TYPICAL OPERATION
To use the module for a typical CRC calculation:
1. Set the CRCEN bit to enable the module.
2. Configure the module for desired operation:
a) Program the desired polynomial using the
CRCXORL and CRCXORH registers, and the
PLEN<4:0> bits.
b) Configure the data width and shift direction
using the DWIDTH and LENDIAN bits.
c) Select the desired interrupt mode using the
CRCISEL bit.
3. Preload the FIFO by writing to the CRCDATL
and CRCDATH registers until the CRCFUL bit is
set or no data is left.
4. Clear old results by writing 00h to CRCWDATL
and CRCWDATH. The CRCWDAT registers can
also be left unchanged to resume a previously
halted calculation.
5. Set the CRCGO bit to start calculation.
6. Write remaining data into the FIFO as space
becomes available.
7. When the calculation completes, CRCGO is
automatically cleared. An interrupt will be
generated if CRCISEL = 1.
8. Read CRCWDATL and CRCWDATH for the
result of the calculation.
There are eight registers used to control programmable
CRC operation:
• CRCCON1
• CRCCON2
• CRCXORL
• CRCXORH
• CRCDATL
• CRCDATH
• CRCWDATL
• CRCWDATH
The CRCCON1 and CRCCON2 registers
(Register 21-1 and Register 21-2) control the operation
of the module and configure the various settings.
The CRCXOR registers (Register 21-3 and
Register 21-4) select the polynomial terms to be used
in the CRC equation. The CRCDAT and CRCWDAT
registers are each register pairs that serve as buffers
for the double-word input data, and CRC processed
output, respectively.
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REGISTER 21-1: CRCCON1: CRC CONTROL 1 REGISTER
R/W-0 U-0 R/W-0 R-0, HSC R-0, HSC R-0, HSC R-0, HSC R-0, HSC
CRCEN — CSIDL VWORD4 VWORD3 VWORD2 VWORD1 VWORD0
bit 15 bit 8
R-0, HSC R-1, HSC R/W-0 R/W-0, HC R/W-0 U-0 U-0 U-0
CRCFUL CRCMPT CRCISEL CRCGO LENDIAN — — —
bit 7 bit 0
Legend: HC = Hardware Clearable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CRCEN: CRC Enable bit
1 = Enables module
0 = Disables module; all state machines, pointers and CRCWDAT/CRCDATH reset; other SFRs are
NOT reset
bit 14 Unimplemented: Read as ‘0’
bit 13 CSIDL: CRC Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12-8 VWORD<4:0>: Pointer Value bits
Indicates the number of valid words in the FIFO. Has a maximum value of 8 when PLEN<4:0> 7 or
16 when PLEN<4:0> 7.
bit 7 CRCFUL: FIFO Full bit
1 = FIFO is full
0 = FIFO is not full
bit 6 CRCMPT: FIFO Empty bit
1 = FIFO is empty
0 = FIFO is not empty
bit 5 CRCISEL: CRC Interrupt Selection bit
1 = Interrupt on FIFO is empty; the final word of data is still shifting through the CRC
0 = Interrupt on shift is complete and results are ready
bit 4 CRCGO: Start CRC bit
1 = Start CRC serial shifter
0 = CRC serial shifter is turned off
bit 3 LENDIAN: Data Shift Direction Select bit
1 = Data word is shifted into the CRC, starting with the LSb (little endian)
0 = Data word is shifted into the CRC, starting with the MSb (big endian)
bit 2-0 Unimplemented: Read as ‘0’
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REGISTER 21-2: CRCCON2: CRC CONTROL 2 REGISTER
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — — DWIDTH4 DWIDTH3 DWIDTH2 DWIDTH1 DWIDTH0
bit 15 bit 8
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — — PLEN4 PLEN3 PLEN2 PLEN1 PLEN0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13 Unimplemented: Read as ‘0’
bit 12-8 DWIDTH<4:0>: Data Word Width Configuration bits
Configures the width of the data word (data word width – 1).
bit 7-5 Unimplemented: Read as ‘0’
bit 4-0 PLEN<4:0>: Polynomial Length Configuration bits
Configures the length of the polynomial (polynomial length – 1).
REGISTER 21-3: CRCXORL: CRC XOR POLYNOMIAL REGISTER, LOW BYTE
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
X15 X14 X13 X12 X11 X10 X9 X8
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0
X7 X6 X5 X4 X3 X2 X1 —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-1 X<15:1>: XOR of Polynomial Term xn Enable bits
bit 0 Unimplemented: Read as ‘0’
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REGISTER 21-4: CRCXORH: CRC XOR HIGH REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
X31 X30 X29 X28 X27 X26 X25 X24
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
X23 X22 X21 X20 X19 X18 X17 X16
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-0 X<31:16>: XOR of Polynomial Term xn Enable bits
REGISTER 21-5: CRCDATL: CRC DATA LOW REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
DATA15 DATA14 DATA13 DATA12 DATA11 DATA10 DATA9 DATA8
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-0 DATA<15:0>: CRC Input Data bits
Writing to this register fills the FIFO; reading from this register returns ‘0’.
REGISTER 21-6: CRCDATH: CRC DATA HIGH REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
DATA15 DATA14 DATA13 DATA12 DATA11 DATA10 DATA9 DATA8
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-0 DATA<15:0>: CRC Input Data bits
Writing to this register fills the FIFO; reading from this register returns ‘0’.
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REGISTER 21-7: CRCWDATL: CRC SHIFT LOW REGISTER
R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
SDATA15 SDATA14 SDATA13 SDATA12 SDATA11 SDATA10 SDATA9 SDATA8
bit 15 bit 8
R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
SDATA7 SDATA6 SDATA5 SDATA4 SDATA3 SDATA2 SDATA1 SDATA0
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-0 SDATA<15:0>: CRC Shift Register bits
Writing to this register writes to the CRC Shift register through the CRC write bus. Reading from this
register reads the CRC read bus.
REGISTER 21-8: CRCWDATH: CRC SHIFT HIGH REGISTER
R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
SDATA31 SDATA30 SDATA29 SDATA28 SDATA27 SDATA26 SDATA25 SDATA24
bit 15 bit 8
R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
SDATA23 SDATA22 SDATA21 SDATA20 SDATA19 SDATA18 SDATA17 SDATA16
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-0 SDATA<31:16>: CRC Input Data bits
Writing to this register writes to the CRC Shift register through the CRC write bus. Reading from this
register reads the CRC read bus.
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DS39975A-page 300 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 301
PIC24FJ256GB210 FAMILY
22.0 10-BIT HIGH-SPEED A/D
CONVERTER
The 10-bit A/D Converter has the following key
features:
• Successive Approximation (SAR) conversion
• Conversion speeds of up to 500 ksps
• 24 analog input pins (PIC24FJXXXGBX10
devices) and 16 analog input pins
(PIC24FJXXXGBX06 devices)
• External voltage reference input pins
• Internal band gap reference inputs
• Automatic Channel Scan mode
• Selectable conversion trigger source
• 32-word conversion result buffer
• Selectable Buffer Fill modes
• Four result alignment options
• Operation during CPU Sleep and Idle modes
On all PIC24FJ256GB210 family devices, the 10-bit
A/D Converter has 24 analog input pins, designated
AN0 through AN23. In addition, there are two analog
input pins for external voltage reference connections
(VREF+ and VREF-). These voltage reference inputs
may be shared with other analog input pins.
A block diagram of the A/D Converter is shown in
Figure 22-1.
To perform an A/D conversion:
1. Configure the A/D module:
a) Configure the port pins as analog inputs
and/or select band gap reference inputs
(ANCFG registers).
b) Select the voltage reference source to
match the expected range on analog inputs
(AD1CON2<15:13>).
c) Select the analog conversion clock to
match the desired data rate with the
processor clock (AD1CON3<7:0>).
d) Select the appropriate sample/conversion
sequence (AD1CON1<7:5> and
AD1CON3<12:8>).
e) Select how the conversion results are
presented in the buffer (AD1CON1<9:8>).
f) Select the interrupt rate (AD1CON2<6:2>).
g) Turn on the A/D module (AD1CON1<15>).
2. Configure the A/D interrupt (if required):
a) Clear the AD1IF bit.
b) Select the A/D interrupt priority.
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 17. “10-Bit A/D Converter”
(DS39705). The information in this data
sheet supersedes the information in the
FRM.
PIC24FJ256GB210 FAMILY
DS39975A-page 302 2010 Microchip Technology Inc.
FIGURE 22-1: 10-BIT HIGH-SPEED A/D CONVERTER BLOCK DIAGRAM
Comparator
10-Bit SAR Conversion Logic
VREF+
DAC
AN23
AN0
AN1
AN2
VREF-
Sample Control
S/H
AVSS
AVDD
AD1BUF0:
AD1BUF1F
AD1CON1
AD1CON2
AD1CON3
AD1CHS
ANCFG
Control Logic
Data Formatting
Input MUX Control
Conversion Control
Pin Config Control
Internal Data Bus
16
VR+VR-
MUX A
MUX B
VINH
VINL
VINH
VINH
VINL
VINL
VR+
VR-
VR Select
VBG
VBG/2
AD1CSSL
AD1CSSH
VBG/6
VCAP
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REGISTER 22-1: AD1CON1: A/D CONTROL REGISTER 1
R/W-0 U-0 R/W-0 U-0 U-0 U-0 R/W-0 R/W-0
ADON(1) —ADSIDL— — —FORM1FORM0
bit 15 bit 8
R/W
-0
R/W
-0
R/W-0
U-0 U-0
R/W-0 R
-0, HSC
R
-0, HSC
SSRC2 SSRC1 SSRC0 —— ASAM SAMP DONE
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 ADON: A/D Operating Mode bit(1)
1 = A/D Converter module is operating
0 = A/D Converter is off
bit 14 Unimplemented: Read as ‘0’
bit 13 ADSIDL: Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12-10 Unimplemented: Read as ‘0’
bit 9-8 FORM<1:0>: Data Output Format bits
11 = Signed fractional (sddd dddd dd00 0000)
10 = Fractional (dddd dddd dd00 0000)
01 = Signed integer (ssss sssd dddd dddd)
00 = Integer (0000 00dd dddd dddd)
bit 7-5 SSRC<2:0>: Conversion Trigger Source Select bits
111 = Internal counter ends sampling and starts conversion (auto-convert)
110 = CTMU event ends sampling and starts conversion
101 = Reserved
100 = Timer5 compare ends sampling and starts conversion
011 = Reserved
010 = Timer3 compare ends sampling and starts conversion
001 = Active transition on INT0 pin ends sampling and starts conversion
000 = Clearing SAMP bit ends sampling and starts conversion
bit 4-3 Unimplemented: Read as ‘0’
bit 2 ASAM: A/D Sample Auto-Start bit
1 = Sampling begins immediately after the last conversion completes; the SAMP bit is auto-set.
0 = Sampling begins when the SAMP bit is set
bit 1 SAMP: A/D Sample Enable bit
1 = A/D sample/hold amplifier is sampling input
0 = A/D sample/hold amplifier is holding
bit 0 DONE: A/D Conversion Status bit
1 = A/D conversion is done
0 = A/D conversion is NOT done
Note 1: The values of the ADC1BUFx registers will not retain their values once the ADON bit is cleared. Read out
the conversion values from the buffer before disabling the module.
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REGISTER 22-2: AD1CON2: A/D CONTROL REGISTER 2
R/W-0 R/W-0 R/W-0 r-0 U-0 R/W-0 U-0 U-0
VCFG2 VCFG1 VCFG0 r— CSCNA — —
bit 15 bit 8
R-0, HSC
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
BUFS SMPI4 SMPI3 SMPI2 SMPI1 SMPI0 BUFM ALTS
bit 7 bit 0
Legend: r = Reserved bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13 VCFG<2:0>: Voltage Reference Configuration bits
bit 12 Reserved: Maintain as ‘0’
bit 11 Unimplemented: Read as ‘0’
bit 10 CSCNA: Scan Input Selections for the CH0+ S/H Input for MUX A Input Multiplexer Setting bit
1 = Scan inputs
0 = Do not scan inputs
bit 9-8 Unimplemented: Read as ‘0’
bit 7 BUFS: Buffer Fill Status bit (valid only when BUFM = 1)
1 = A/D is currently filling buffer, 10-1F, user should access data in 00-0F
0 = A/D is currently filling buffer, 00-0F, user should access data in 10-1F
bit 6-2 SMPI<4:0>: Sample/Convert Sequences Per Interrupt Selection bits
11111 = Interrupts at the completion of conversion for each 32nd sample/convert sequence
11110 = Interrupts at the completion of conversion for each 31st sample/convert sequence
.
.
.
00001 = Interrupts at the completion of conversion for each 2nd sample/convert sequence
00000 = Interrupts at the completion of conversion for each sample/convert sequence
bit 1 BUFM: Buffer Mode Select bit
1 = Buffer is configured as two 16-word buffers (ADC1BUFn<31:16> and ADC1BUFn<15:0>)
0 = Buffer is configured as one 32-word buffer (ADC1BUFn<31:0>)
bit 0 ALTS: Alternate Input Sample Mode Select bit
1 = Uses MUX A input multiplexer settings for the first sample, then alternates between MUX B and
MUX A input multiplexer settings for all subsequent samples
0 = Always uses the MUX A input multiplexer settings
VCFG<2:0> VR+VR-
000 AVDD AVSS
001 External VREF+ pin AVSS
010 AVDD External VREF- pin
011 External VREF+ pin External VREF- pin
1xx AVDD AVSS
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REGISTER 22-3: AD1CON3: A/D CONTROL REGISTER 3
R/W-0 r-0 r-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ADRC rr SAMC4 SAMC3 SAMC2 SAMC1 SAMC0
bit 15 bit 8
R/W
-0
R/W
-0
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ADCS7 ADCS6 ADCS5 ADCS4 ADCS3 ADCS2 ADCS1 ADCS0
bit 7 bit 0
Legend: r = Reserved bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 ADRC: A/D Conversion Clock Source bit
1 = A/D internal RC clock
0 = Clock is derived from the system clock
bit 14-13 Reserved: Maintain as ‘0’
bit 12-8 SAMC<4:0>: Auto-Sample Time bits
11111 = 31 T
AD
.
.
.
00001 = 1 TAD
00000 = 0 TAD (not recommended)
bit 7-0 ADCS<7:0>: A/D Conversion Clock Select bits
11111111 = 256 * TCY
······
00000001 = 2 * T
CY
00000000 = TCY
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REGISTER 22-4: AD1CHS: A/D INPUT SELECT REGISTER
R/W-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CH0NB —— CH0SB4(1) CH0SB3(1) CH0SB2(1) CH0SB1(1) CH0SB0(1)
bit 15 bit 8
R/W
-0
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CH0NA —— CH0SA4(1) CH0SA3(1) CH0SA2(1) CH0SA1(1) CH0SA0(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CH0NB: Channel 0 Negative Input Select for MUX B Multiplexer Setting bit
1 = Channel 0 negative input is AN1
0 = Channel 0 negative input is VR-
bit 14-13 Unimplemented: Read as ‘0’
bit 12-8 CH0SB<4:0>: Channel 0 Positive Input Select for MUX B(1)
Other = Not available; do not use
11111 = No channel used; all inputs are floating; used for CTMU
11011 = Channel 0 positive input is the band gap divided-by-six reference (VBG/6)
11010 = Channel 0 positive input is the core voltage (VCAP)
11001 = Channel 0 positive input is the band gap reference (VBG)
11000 = Channel 0 positive input is the band gap divided-by-two reference (VBG/2)
10111 = Channel 0 positive input is AN23(2)
.
.
.
00001 = Channel 0 positive input is AN1
00000 = Channel 0 positive input is AN0
bit 7 CH0NA: Channel 0 Negative Input Select for MUX A Multiplexer Setting bit
1 = Channel 0 negative input is AN1
0 = Channel 0 negative input is VR-
bit 6-5 Unimplemented: Read as ‘0’
bit 4-0 CH0SA<4:0>: Channel 0 Positive Input Select for MUX(1)
Other = Not available; do not use
11111 = No Channel used; all inputs are floating; used for CTMU
11011 = Channel 0 positive input is the band gap divided-by-six reference (VBG/6)
11010 = Channel 0 positive input is the core voltage (VCAP)
11001 = Channel 0 positive input is the band gap reference (VBG)
11000 = Channel 0 positive input is the band gap divided-by-two reference (VBG/2)
10111 = Channel 0 positive input is AN23(2)
.
.
.
00001 = Channel 0 positive input is AN1
00000 = Channel 0 positive input is AN0
Note 1: Combinations not shown here (11100 to 11110) are unimplemented; do not use.
2: Channel 0 positive inputs, AN16 through AN23, are not available on 64-pin devices (PIC24FJXXXGB206).
2010 Microchip Technology Inc. DS39975A-page 307
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REGISTER 22-5: ANCFG: A/D BAND GAP REFERENCE CONFIGURATION REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0
— — — — — VBG6EN VBG2EN VBGEN
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-3 Unimplemented: Read as ‘0’
bit 2 VBG6EN: A/D Input VBG/6 Enable bit
1 = Band gap voltage divided-by-six reference (VBG/6) is enabled
0 = Band gap divided-by-six reference (VBG/6) is disabled
bit 1 VBG2EN: A/D Input VBG/2 Enable bit
1 = Band gap voltage divided-by-two reference (VBG/2) is enabled
0 = Band gap divided-by-two reference (VBG/2) is disabled
bit 0 VBGEN: A/D Input VBG Enable bit
1 = Band gap voltage reference (VBG) is enabled
0 = Band gap reference (VBG) is disabled
REGISTER 22-6: AD1CSSL: A/D INPUT SCAN SELECT REGISTER (LOW)
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CSSL15 CSSL14 CSSL13 CSSL12 CSSL11 CSSL10 CSSL9 CSSL8
bit 15 bit 8
R/W
-0
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CSSL7 CSSL6 CSSL5 CSSL4 CSSL3 CSSL2 CSSL1 CSSL0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-0 CSSL<15:0>: A/D Input Pin Scan Selection bits
1 = Corresponding analog channel is selected for input scan
0 = Analog channel is omitted from input scan
PIC24FJ256GB210 FAMILY
DS39975A-page 308 2010 Microchip Technology Inc.
EQUATION 22-1: A/D CONVERSION CLOCK PERIOD(1)
REGISTER 22-7: AD1CSSH: A/D INPUT SCAN SELECT REGISTER (HIGH)
U-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0
———— CSSL27 CSSL26 CSSL25 CSSL24
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CSSL23(1) CSSL22(1) CSSL21(1) CSSL20(1) CSSL19(1) CSSL18(1) CSSL17(1) CSSL16(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-12 Unimplemented: Read as ‘0’
bit 11 CSSL27: A/D Input Band Gap Scan Selection bit
1 =Band gap divided-by-six reference (VBG/6) is selected for input scan
0 =Analog channel is omitted from input scan
bit 10 CSSL26: A/D Input Band Gap Scan Selection bit
1 =Internal core voltage (VCAP) is selected for input scan
0 =Analog channel is omitted from input scan
bit 9 CSSL25: A/D Input Half Band Gap Scan Selection bit
1 =Band gap reference (VBG) is selected for input scan
0 =Analog channel is omitted from input scan
bit 8 CSSL24: A/D Input Band Gap Scan Selection bit
1 = Band gap divided-by-two reference (VBG/2) is selected for input scan
0 = Analog channel is omitted from input scan
bit 7-0 CSSL<23:16>: Analog Input Pin Scan Selection bits(1)
1 = Corresponding analog channel is selected for input scan
0 = Analog channel is omitted from input scan
Note 1: Unimplemented in 64-pin devices, read as ‘0’.
Note 1: Based on TCY = 2 * TOSC; Doze mode and PLL are disabled.
ADCS = TAD
TCY – 1
TAD = TCY • (ADCS = 1)
2010 Microchip Technology Inc. DS39975A-page 309
PIC24FJ256GB210 FAMILY
FIGURE 22-2: 10-BIT A/D CONVERTER ANALOG INPUT MODEL
FIGURE 22-3: A/D TRANSFER FUNCTION
CPIN
VA
Rs ANx VT = 0.6V
VT = 0.6V ILEAKAGE
RIC 250Sampling
Switch
RSS
CHOLD
= DAC Capacitance
VSS
VDD
= 4.4 pF (Typical)
500 nA
Legend: CPIN
VT
ILEAKAGE
RIC
RSS
CHOLD
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to
= Interconnect Resistance
= Sampling Switch Resistance
= Sample/Hold Capacitance (from DAC)
various junctions
Note: CPIN value depends on the device package and is not tested. The effect of CPIN IS negligible if Rs 5 k.
RSS 5 k(Typical)
6-11 pF
(Typical)
10 0000 0001 (513)
10 0000 0010 (514)
10 0000 0011 (515)
01 1111 1101 (509)
01 1111 1110 (510)
01 1111 1111 (511)
11 1111 1110 (1022)
11 1111 1111 (1023)
00 0000 0000 (0)
00 0000 0001 (1)
Output Code
10 0000 0000 (512)
(VINH – VINL)
VR-
VR+ – VR-
1024
512*(VR+ – VR-)
1024
VR+
VR- +
VR- +
1023*(VR+ – VR-)
1024
VR- +
0
(Binary (Decimal))
Voltage Level
PIC24FJ256GB210 FAMILY
DS39975A-page 310 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 311
PIC24FJ256GB210 FAMILY
23.0 TRIPLE COMPARATOR
MODULE
The triple comparator module provides three dual input
comparators. The inputs to the comparator can be
configured to use any one of five external analog inputs
(CxINA, CxINB, CxINC, CxIND and VREF+) and a
voltage reference input from one of the internal band
gap references or the comparator voltage reference
generator (VBG, VBG/2, VBG/6 and CVREF).
The comparator outputs may be directly connected to
the CxOUT pins. When the respective COE equals ‘1’,
the I/O pad logic makes the unsynchronized output of
the comparator available on the pin.
A simplified block diagram of the module in shown in
Figure 23-1. Diagrams of the possible individual
comparator configurations are shown in Figure 23-2.
Each comparator has its own control register,
CMxCON (Register 23-1), for enabling and configuring
its operation. The output and event status of all three
comparators is provided in the CMSTAT register
(Register 23-2).
FIGURE 23-1: TRIPLE COMPARATOR MODULE BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
associated “PIC24F Family Reference
Manual”.
C1
VIN-
VIN+
CXINB
CXINC
CXINA
CXIND
CVREF
VBG
C2
VIN-
VIN+
C3
VIN-
VIN+
COE
C1OUT
Pin
CPOL
Trigger/Interrupt
Logic
CEVT
EVPOL<1:0>
COUT
Input
Select
Logic
CCH<1:0>
CREF
COE
C2OUT
Pin
CPOL
Trigger/Interrupt
Logic
CEVT
EVPOL<1:0>
COUT
COE
C3OUT
Pin
CPOL
Trigger/Interrupt
Logic
CEVT
EVPOL<1:0>
COUT
VBG/2
VBG/6
VREF+
CVREFM<1:0>(1)
VREF+
CVREFP(1)
+
01
00
10
11
01
00
10
11
1
0
0
1
Note 1: Refer Register 24-1 for bit details.
PIC24FJ256GB210 FAMILY
DS39975A-page 312 2010 Microchip Technology Inc.
FIGURE 23-2: INDIVIDUAL COMPARATOR CONFIGURATIONS WHEN CREF = 0
Cx
VIN-
VIN+Off (Read as ‘0’)
Comparator Off
CEN = 0, CREF = x, CCH<1:0> = xx
Comparator CxINB > CxINA Compare
CEN = 1, CCH<1:0> = 00
COE
CxOUT
Cx
VIN-
VIN+
COE
CXINB
CXINA
Comparator CxIND > CxINA Compare
CEN = 1, CCH<1:0> = 10
Cx
VIN-
VIN+
COE
CxOUT
CXIND
CXINA
Comparator CxINC > CxINA Compare
Cx
VIN-
VIN+
COE
CXINC
CXINA
Comparator VBG > CxINA Compare
Cx
VIN-
VIN+
COE
VBG
CXINA
Pin
Pin
CxOUT
Pin
CxOUT
Pin
CxOUT
Pin
Comparator VBG > CxINA Compare
CEN = 1, CCH<1:0> = 11
Cx
VIN-
VIN+
COE
VBG/2
CXINA CxOUT
Pin
Comparator VBG > CxINA Compare
Cx
VIN-
VIN+
COE
VBG/6
CXINA CxOUT
Pin
Comparator CxIND > CxINA Compare
Cx
VIN-
VIN+
COE
CxOUT
VREF+
CXINA
Pin
CVREFM<1:0> = xx
CVREFM<1:0> = xx
CVREFM<1:0> = 01
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 11
CEN = 1, CCH<1:0> = 01 CVREFM<1:0> = xx
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 00
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 10
2010 Microchip Technology Inc. DS39975A-page 313
PIC24FJ256GB210 FAMILY
FIGURE 23-3: INDIVIDUAL COMPARATOR CONFIGURATIONS WHEN CREF = 1 AND CVREFP = 0
FIGURE 23-4: INDIVIDUAL COMPARATOR CONFIGURATIONS WHEN CREF = 1 AND CVREFP = 1
Comparator CxIND > CVREF Compare
Cx
VIN-
VIN+
COE
CXIND
CVREF CxOUT
Pin
Comparator VBG > CVREF Compare
Cx
VIN-
VIN+
COE
VBG
CVREF CxOUT
Pin
Comparator CxINC > CVREF Compare
Cx
VIN-
VIN+
COE
CXINC
CVREF CxOUT
Pin
Comparator CxINB > CVREF Compare
CEN = 1, CCH<1:0> = 00
Cx
VIN-
VIN+
COE
CXINB
CVREF CxOUT
Pin
Comparator VBG > CVREF Compare
Cx
VIN-
VIN+
COE
VBG/2
CVREF CxOUT
Pin
Comparator VBG > CVREF Compare
Cx
VIN-
VIN+
COE
VBG/6
CVREF CxOUT
Pin
Comparator CxIND > CVREF Compare
Cx
VIN-
VIN+
COE
VREF+
CVREF CxOUT
Pin
CVREFM<1:0> = xx
CEN = 1, CCH<1:0> = 10 CVREFM<1:0> = xx
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 01
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 11
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 10
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 00
CEN = 1, CCH<1:0> = 01 CVREFM<1:0> = xx
Comparator CxIND > CVREF Compare
Cx
VIN-
VIN+
COE
CXIND
VREF+CxOUT
Pin
Comparator VBG > CVREF Compare
Cx
VIN-
VIN+
COE
VBG
VREF+CxOUT
Pin
Comparator CxINC > CVREF Compare
Cx
VIN-
VIN+
COE
CXINC
VREF+CxOUT
Pin
Comparator CxINB > CVREF Compare
Cx
VIN-
VIN+
COE
CXINB
VREF+CxOUT
Pin
Comparator VBG > CVREF Compare
Cx
VIN-
VIN+
COE
VBG/2
VREF+CxOUT
Pin
Comparator VBG > CVREF Compare
Cx
VIN-
VIN+
COE
VBG/6
VREF+CxOUT
Pin
CEN = 1, CCH<1:0> = 00 CVREFM<1:0> = xx
CEN = 1, CCH<1:> = 10 CVREFM<1:0> = xx
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 01 CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 10
CEN = 1, CCH<1:0> = 11 CVREFM<1:0> = 00
CEN = 1, CCH<1:0> = 01 CVREFM<1:0> = xx
PIC24FJ256GB210 FAMILY
DS39975A-page 314 2010 Microchip Technology Inc.
REGISTER 23-1: CMxCON: COMPARATOR x CONTROL REGISTERS
(COMPARATORS 1 THROUGH 3)
R/W-0 R/W-0 R/W-0 U-0 U-0 U-0 R/W-0, HS R-0, HSC
CEN COE CPOL — — — CEVT COUT
bit 15 bit 8
R/W-0 R/W-0 U-0 R/W-0 U-0 U-0 R/W-0 R/W-0
EVPOL1 EVPOL0 — CREF —— CCH1 CCH0
bit 7 bit 0
Legend: HS = Hardware Settable bit HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CEN: Comparator Enable bit
1 = Comparator is enabled
0 = Comparator is disabled
bit 14 COE: Comparator Output Enable bit
1 = Comparator output is present on the CxOUT pin
0 = Comparator output is internal only
bit 13 CPOL: Comparator Output Polarity Select bit
1 = Comparator output is inverted
0 = Comparator output is not inverted
bit 12-10 Unimplemented: Read as ‘0’
bit 9 CEVT: Comparator Event bit
1 = Comparator event that is defined by EVPOL<1:0> has occurred; subsequent triggers and interrupts
are disabled until the bit is cleared
0 = Comparator event has not occurred
bit 8 COUT: Comparator Output bit
When CPOL = 0:
1 =VIN+ > VIN-
0 =V
IN+ < VIN-
When CPOL = 1:
1 =VIN+ < VIN-
0 =V
IN+ > VIN-
bit 7-6 EVPOL<1:0>: Trigger/Event/Interrupt Polarity Select bits
11 = Trigger/event/interrupt is generated on any change of the comparator output (while CEVT = 0)
10 = Trigger/event/interrupt is generated on transition of the comparator output:
If CPOL = 0 (non-inverted polarity):
High-to-low transition only.
If CPOL = 1 (inverted polarity):
Low-to-high transition only.
01 = Trigger/event/interrupt is generated on transition of comparator output:
If CPOL = 0 (non-inverted polarity):
Low-to-high transition only.
If CPOL = 1 (inverted polarity):
High-to-low transition only.
00 = Trigger/event/interrupt generation is disabled
bit 5 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 315
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bit 4 CREF: Comparator Reference Select bits (non-inverting input)
1 = Non-inverting input connects to the internal CVREF voltage
0 = Non-inverting input connects to the CXINA pin
bit 3-2 Unimplemented: Read as ‘0’
bit 1-0 CCH<1:0>: Comparator Channel Select bits
11 = Inverting input of the comparator connects to the internal selectable reference voltage specified
by the CVREFM<1:0> bits in the CVRCON register
10 = Inverting input of the comparator connects to the CXIND pin
01 = Inverting input of the comparator connects to the CXINC pin
00 = Inverting input of the comparator connects to the CXINB pin
REGISTER 23-1: CMxCON: COMPARATOR x CONTROL REGISTERS
(COMPARATORS 1 THROUGH 3) (CONTINUED)
REGISTER 23-2: CMSTAT: COMPARATOR MODULE STATUS REGISTER
R/W-0 U-0 U-0 U-0 U-0 R-0, HSC R-0, HSC R-0, HSC
CMIDL — — — — C3EVT C2EVT C1EVT
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 R-0, HSC R-0, HSC R-0, HSC
— — — — — C3OUT C2OUT C1OUT
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CMIDL: Comparator Stop in Idle Mode bit
1 = Discontinue operation of all comparators when device enters Idle mode
0 = Continue operation of all enabled comparators in Idle mode
bit 14-11 Unimplemented: Read as ‘0’
bit 10 C3EVT: Comparator 3 Event Status bit (read-only)
Shows the current event status of Comparator 3 (CM3CON<9>).
bit 9 C2EVT: Comparator 2 Event Status bit (read-only)
Shows the current event status of Comparator 2 (CM2CON<9>).
bit 8 C1EVT: Comparator 1 Event Status bit (read-only)
Shows the current event status of Comparator 1 (CM1CON<9>).
bit 7-3 Unimplemented: Read as ‘0’
bit 2 C3OUT: Comparator 3 Output Status bit (read-only)
Shows the current output of Comparator 3 (CM3CON<8>).
bit 1 C2OUT: Comparator 2 Output Status bit (read-only)
Shows the current output of Comparator 2 (CM2CON<8>).
bit 0 C1OUT: Comparator 1 Output Status bit (read-only)
Shows the current output of Comparator 1 (CM1CON<8>).
PIC24FJ256GB210 FAMILY
DS39975A-page 316 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 317
PIC24FJ256GB210 FAMILY
24.0 COMPARATOR VOLTAGE
REFERENCE
24.1 Configuring the Comparator
Voltage Reference
The voltage reference module is controlled through the
CVRCON register (Register 24-1). The comparator
voltage reference provides two ranges of output
voltage, each with 16 distinct levels. The range to be
used is selected by the CVRR bit (CVRCON<5>). The
primary difference between the ranges is the size of the
steps selected by the CVREF Selection bits
(CVR<3:0>), with one range offering finer resolution.
The comparator reference supply voltage can come
from either VDD and VSS, or the external VREF+ and
VREF-. The voltage source is selected by the CVRSS
bit (CVRCON<4>).
The settling time of the comparator voltage reference
must be considered when changing the CVREF
output.
FIGURE 24-1: COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 19. “Comparator Module”
(DS39710). The information in this data
sheet supersedes the information in the
FRM.
16-to-1 MUX
CVR<3:0>
8R
R
CVREN
CVRSS = 0
AVDD
VREF+CVRSS = 1
8R
CVRSS = 0
VREF-CVRSS = 1
R
R
R
R
R
R
16 Steps
CVRR
CVREF
AVSS
CVROE
CVREF
Pin
PIC24FJ256GB210 FAMILY
DS39975A-page 318 2010 Microchip Technology Inc.
REGISTER 24-1: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0
— — — — — CVREFP CVREFM1 CVREFM0
bit 15 bit 8
R/W
-0
R/W
-0
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CVREN CVROE CVRR CVRSS CVR3 CVR2 CVR1 CVR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-11 Unimplemented: Read as ‘0’
bit 10 CVREFP: Voltage Reference Select bit (valid only when CREF is ‘1’)
1 =V
REF+ is used as a reference voltage to the comparators
0 = The CVR (4-bit DAC) within this module provides the the reference voltage to the comparators
bit 9-8 CVREFM<1:0>: Band Gap Reference Source Select bits (valid only when CCH<1:0> = 11)
00 = Band gap voltage is provided as an input to the comparators
01 = Band gap voltage divided-by-two is provided as an input to the comparators
10 = Band gap voltage divided-by-six is provided as an input to the comparators
11 =V
REF+ pin is provided as an input the comparators
bit 7 CVREN: Comparator Voltage Reference Enable bit
1 =CVREF circuit is powered on
0 =CV
REF circuit is powered down
bit 6 CVROE: Comparator VREF Output Enable bit
1 = CVREF voltage level is output on the CVREF pin
0 = CVREF voltage level is disconnected from the CVREF pin
bit 5 CVRR: Comparator VREF Range Selection bit
1 =CV
RSRC range should be 0 to 0.625 CVRSRC with CVRSRC/24 step size
0 =CV
RSRC range should be 0.25 to 0.719 CVRSRC with CVRSRC/32 step size
bit 4 CVRSS: Comparator VREF Source Selection bit
1 = Comparator reference source, CVRSRC = VREF+ – VREF-
0 = Comparator reference source, CVRSRC = AVDD – AVSS
bit 3-0 CVR<3:0>: Comparator VREF Value Selection 0 CVR<3:0> 15 bits
When CVRR = 1:
CVREF = (CVR<3:0>/ 24) (CVRSRC)
When CVRR = 0:
CVREF = 1/4 (CVRSRC) + (CVR<3:0>/32) (CVRSRC)
2010 Microchip Technology Inc. DS39975A-page 319
PIC24FJ256GB210 FAMILY
25.0 CHARGE TIME
MEASUREMENT UNIT (CTMU)
The Charge Time Measurement Unit (CTMU) is a flexible
analog module that provides accurate differential time
measurement between pulse sources, as well as
asynchronous pulse generation. Its key features include:
• Four edge input trigger sources
• Polarity control for each edge source
• Control of edge sequence
• Control of response to edges
• Time measurement resolution of 1 nanosecond
• Accurate current source suitable for capacitive
measurement
Together with other on-chip analog modules, the CTMU
can be used to precisely measure time, measure
capacitance, measure relative changes in capacitance
or generate output pulses that are independent of the
system clock. The CTMU module is ideal for interfacing
with capacitive-based sensors.
The CTMU is controlled through two registers:
CTMUCON and CTMUICON. CTMUCON enables the
module, and controls edge source selection, edge
source polarity selection, and edge sequencing. The
CTMUICON register controls the selection and trim of
the current source.
25.1 Measuring Capacitance
The CTMU module measures capacitance by generat-
ing an output pulse with a width equal to the time
between edge events on two separate input channels.
The pulse edge events to both input channels can be
selected from four sources: two internal peripheral
modules (OC1 and Timer1) and two external pins
(CTEDG1 and CTEDG2). This pulse is used with the
module’s precision current source to calculate
capacitance according to the relationship:
For capacitance measurements, the A/D Converter
samples an external capacitor (CAPP) on one of its
input channels after the CTMU output’s pulse. A preci-
sion resistor (RPR) provides current source calibration
on a second A/D channel. After the pulse ends, the
converter determines the voltage on the capacitor. The
actual calculation of capacitance is performed in
software by the application.
Figure 25-1 shows the external connections used for
capacitance measurements, and how the CTMU and
A/D modules are related in this application. This
example also shows the edge events coming from
Timer1, but other configurations using external edge
sources are possible. A detailed discussion on measur-
ing capacitance and time with the CTMU module is
provided in the “PIC24F Family Reference Manual”.
FIGURE 25-1: TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR
CAPACITANCE MEASUREMENT
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
associated “PIC24F Family Reference
Manual”, Section 11. “Charge Time
Measurement Unit (CTMU)” (DS39724).
The information in this data sheet
supersedes the information in the FRM.
CI
dV
dT
-------=
PIC24F Device
A/D Converter
CTMU
ANx
CAPP
Output
Pulse
EDG1
EDG2
RPR
ANY
Timer1
Current Source
PIC24FJ256GB210 FAMILY
DS39975A-page 320 2010 Microchip Technology Inc.
25.2 Measuring Time
Time measurements on the pulse width can be similarly
performed using the A/D module’s internal capacitor
(CAD) and a precision resistor for current calibration.
Figure 25-2 shows the external connections used for
time measurements, and how the CTMU and A/D
modules are related in this application. This example
also shows both edge events coming from the external
CTEDG pins, but other configurations using internal
edge sources are possible. A detailed discussion on
measuring capacitance and time with the CTMU module
is provided in the “PIC24F Family Reference Manual”.
25.3 Pulse Generation and Delay
The CTMU module can also generate an output pulse
with edges that are not synchronous with the device’s
system clock. More specifically, it can generate a pulse
with a programmable delay from an edge event input to
the module.
When the module is configured for pulse generation
delay by setting the TGEN (CTMUCON<12>) bit, the
internal current source is connected to the B input of
Comparator 2. A capacitor (CDELAY) is connected to
the Comparator 2 pin, C2INB, and the comparator volt-
age reference, CVREF, is connected to C2INA. CVREF
is then configured for a specific trip point. The module
begins to charge CDELAY when an edge event is
detected. When CDELAY charges above the CVREF trip
point, a pulse is output on CTPLS. The length of the
pulse delay is determined by the value of CDELAY and
the CVREF trip point.
Figure 25-3 shows the external connections for pulse
generation, as well as the relationship of the different
analog modules required. While CTEDG1 is shown as
the input pulse source, other options are available. A
detailed discussion on pulse generation with the CTMU
module is provided in the “PIC24F Family Reference
Manual”.
FIGURE 25-2: TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR
TIME MEASUREMENT
FIGURE 25-3: TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR PULSE
DELAY GENERATION
PIC24F Device
A/D Converter
CTMU
CTEDG1
CTEDG2
ANx
Output
Pulse
EDG1
EDG2
CAD
RPR
Current Source
C2
CVREF
CTPLS
PIC24F Device
Current Source
Comparator
CTMU
CTEDG1
C2INB
CDELAY
EDG1
2010 Microchip Technology Inc. DS39975A-page 321
PIC24FJ256GB210 FAMILY
REGISTER 25-1: CTMUCON: CTMU CONTROL REGISTER
R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CTMUEN —CTMUSIDLTGEN
(1) EDGEN EDGSEQEN IDISSEN CTTRIG
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0, HSC R/W-0, HSC
EDG2POL EDG2SEL1 EDG2SEL0 EDG1POL EDG1SEL1 EDG1SEL0 EDG2STAT EDG1STAT
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CTMUEN: CTMU Enable bit
1 = Module is enabled
0 = Module is disabled
bit 14 Unimplemented: Read as ‘0’
bit 13 CTMUSIDL: Stop in Idle Mode bit
1 = Discontinue module operation when the device enters Idle mode
0 = Continue module operation in Idle mode
bit 12 TGEN: Time Generation Enable bit(1)
1 = Enables edge delay generation
0 = Disables edge delay generation
bit 10 EDGEN: Edge Enable bit
1 = Edges are not blocked
0 = Edges are blocked
bit 10 EDGSEQEN: Edge Sequence Enable bit
1 = Edge 1 event must occur before Edge 2 event can occur
0 = No edge sequence is needed
bit 9 IDISSEN: Analog Current Source Control bit
1 = Analog current source output is grounded
0 = Analog current source output is not grounded
bit 8 CTTRIG: Trigger Control bit
1 = Trigger output is enabled
0 = Trigger output is disabled
bit 7 EDG2POL: Edge 2 Polarity Select bit
1 = Edge 2 is programmed for a positive edge response
0 = Edge 2 is programmed for a negative edge response
bit 6-5 EDG2SEL<1:0>: Edge 2 Source Select bits
11 =CTEDG1 pin
10 =CTEDG2 pin
01 = OC1 module
00 = Timer1 module
bit 4 EDG1POL: Edge 1 Polarity Select bit
1 = Edge 1 is programmed for a positive edge response
0 = Edge 1 is programmed for a negative edge response
Note 1: If TGEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. See
Section 10.4 “Peripheral Pin Select (PPS)” for more information.
PIC24FJ256GB210 FAMILY
DS39975A-page 322 2010 Microchip Technology Inc.
bit 3-2 EDG1SEL<1:0>: Edge 1 Source Select bits
11 =CTEDG1 pin
10 =CTEDG2 pin
01 = OC1 module
00 = Timer1 module
bit 1 EDG2STAT: Edge 2 Status bit
1 = Edge 2 event has occurred
0 = Edge 2 event has not occurred
bit 0 EDG1STAT: Edge 1 Status bit
1 = Edge 1 event has occurred
0 = Edge 1 event has not occurred
REGISTER 25-1: CTMUCON: CTMU CONTROL REGISTER (CONTINUED)
Note 1: If TGEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. See
Section 10.4 “Peripheral Pin Select (PPS)” for more information.
REGISTER 25-2: CTMUICON: CTMU CURRENT CONTROL REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ITRIM5 ITRIM4 ITRIM3 ITRIM2 ITRIM1 ITRIM0 IRNG1 IRNG0
bit 15 bit 8
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-10 ITRIM<5:0>: Current Source Trim bits
011111 = Maximum positive change from nominal current
011110
.
.
.
000001 = Minimum positive change from nominal current
000000 = Nominal current output specified by IRNG<1:0>
111111 = Minimum negative change from nominal current
.
.
.
100010
100001 = Maximum negative change from nominal current
bit 9-8 IRNG<1:0>: Current Source Range Select bits
11 = 100 Base Current
10 =10 Base Current
01 = Base current level (0.55 A nominal)
00 = Current source is disabled
bit 7-0 Unimplemented: Read as ‘0’
2010 Microchip Technology Inc. DS39975A-page 323
PIC24FJ256GB210 FAMILY
26.0 SPECIAL FEATURES
PIC24FJ256GB210 family devices include several
features intended to maximize application flexibility and
reliability, and minimize cost through elimination of
external components. These are:
• Flexible Configuration
• Watchdog Timer (WDT)
• Code Protection
• JTAG Boundary Scan Interface
• In-Circuit Serial Programming™
• In-Circuit Emulation
26.1 Configuration Bits
The Configuration bits can be programmed (read as ‘0’),
or left unprogrammed (read as ‘1’), to select various
device configurations. These bits are mapped starting at
program memory location F80000h. A detailed explana-
tion of the various bit functions is provided in
Register 26-1 through Register 26-6.
Note that address F80000h is beyond the user program
memory space. In fact, it belongs to the configuration
memory space (800000h-FFFFFFh) which can only be
accessed using table reads and table writes.
26.1.1 CONSIDERATIONS FOR
CONFIGURING PIC24FJ256GB210
FAMILY DEVICES
In PIC24FJ256GB210 family devices, the configuration
bytes are implemented as volatile memory. This means
that configuration data must be programmed each time
the device is powered up. Configuration data is stored
in the three words at the top of the on-chip program
memory space, known as the Flash Configuration
Words. Their specific locations are shown in
Table 26-1. These are packed representations of the
actual device Configuration bits, whose actual
locations are distributed among several locations in
configuration space. The configuration data is automat-
ically loaded from the Flash Configuration Words to the
proper Configuration registers during device Resets.
When creating applications for these devices, users
should always specifically allocate the location of the
Flash Configuration Word for configuration data. This is
to make certain that program code is not stored in this
address when the code is compiled.
The upper byte of all Flash Configuration Words in pro-
gram memory should always be ‘0000 0000’. This
makes them appear to be NOP instructions in the
remote event that their locations are ever executed by
accident. Since Configuration bits are not implemented
in the corresponding locations, writing ‘0’s to these
locations has no effect on device operation.
TABLE 26-1: FLASH CONFIGURATION WORD LOCATIONS FOR PIC24FJ256GB210 FAMILY
DEVICES
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
following sections of the “PIC24F Family
Reference Manual”. The information in
this data sheet supersedes the information
in the FRMs.
•
Section 9. “Watchdog Timer (WDT)”
(DS39697)
•
Section 32. “High-Level Device
Integration”
(DS39719)
•
Section 33. “Programming and
Diagnostics”
(DS39716)
Note: Configuration data is reloaded on all types
of device Resets.
Note: Performing a page erase operation on the
last page of program memory clears the
Flash Configuration Words, enabling code
protection as a result. Therefore, users
should avoid performing page erase
operations on the last page of program
memory.
Device
Configuration Word Addresses
1234
PIC24FJ128GB2XX 157FEh 157FCh 157FAh 157F8h
PIC24FJ256GB2XX 2ABFEh 2ABFCh 2ABFAh 2ABF8h
PIC24FJ256GB210 FAMILY
DS39975A-page 324 2010 Microchip Technology Inc.
REGISTER 26-1: CW1: FLASH CONFIGURATION WORD 1
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 23 bit 16
r-x R/PO-1 R/PO-1 R/PO-1 R/PO-1 r-1 R/PO-1 R/PO-1
reserved JTAGEN GCP GWRP DEBUG reserved ICS1 ICS0
bit 15 bit 8
R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1
FWDTEN WINDIS ALTVREF(1)
FWPSA WDTPS3 WDTPS2 WDTPS1 WDTPS0
bit 7 bit 0
Legend: r = Reserved bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 23-16 Unimplemented: Read as ‘1’
bit 15 Reserved: The value is unknown; program as ‘0’
bit 14 JTAGEN: JTAG Port Enable bit
1 = JTAG port is enabled
0 = JTAG port is disabled
bit 13 GCP: General Segment Program Memory Code Protection bit
1 = Code protection is disabled
0 = Code protection is enabled for the entire program memory space
bit 12 GWRP: General Segment Code Flash Write Protection bit
1 = Writes to program memory are allowed
0 = Writes to program memory are not allowed
bit 11 DEBUG: Background Debugger Enable bit
1 = Device resets into Operational mode
0 = Device resets into Debug mode
bit 10 Reserved: Always maintain as ‘1’
bit 9-8 ICS<1:0>: Emulator Pin Placement Select bits
11 = Emulator functions are shared with PGEC1/PGED1
10 = Emulator functions are shared with PGEC2/PGED2
01 = Emulator functions are shared with PGEC3/PGED3
00 = Reserved; do not use
bit 7 FWDTEN: Watchdog Timer Enable bit
1 = Watchdog Timer is enabled
0 = Watchdog Timer is disabled
bit 6 WINDIS: Windowed Watchdog Timer Disable bit
1 = Standard Watchdog Timer is enabled
0 = Windowed Watchdog Timer is enabled; FWDTEN must be ‘1’
bit 5 ALTVREF: Alternate VREF Pin Selection bit(1)
1 =VREF is on a default pin (VREF+ on RA10 and VREF- on RA9)
0 =V
REF is on an alternate pin (VREF+ on RB0 and VREF- on RB1)
Note 1: Unimplemented in 64-pin devices, maintain at ‘1’ (VREF+ on RB0 and VREF- on RB1).
2010 Microchip Technology Inc. DS39975A-page 325
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bit 4 FWPSA: WDT Prescaler Ratio Select bit
1 = Prescaler ratio of 1:128
0 = Prescaler ratio of 1:32
bit 3-0 WDTPS<3:0>: Watchdog Timer Postscaler Select bits
1111 = 1:32,768
1110 = 1:16,384
1101 = 1:8,192
1100 = 1:4,096
1011 = 1:2,048
1010 = 1:1,024
1001 = 1:512
1000 = 1:256
0111 = 1:128
0110 = 1:64
0101 = 1:32
0100 = 1:16
0011 = 1:8
0010 = 1:4
0001 = 1:2
0000 = 1:1
REGISTER 26-1: CW1: FLASH CONFIGURATION WORD 1 (CONTINUED)
Note 1: Unimplemented in 64-pin devices, maintain at ‘1’ (VREF+ on RB0 and VREF- on RB1).
PIC24FJ256GB210 FAMILY
DS39975A-page 326 2010 Microchip Technology Inc.
REGISTER 26-2: CW2: FLASH CONFIGURATION WORD 2
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 23 bit 16
R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1
IESO PLLDIV2 PLLDIV1 PLLDIV0 PLL96MHZ FNOSC2 FNOSC1 FNOSC0
bit 15 bit 8
R/PO-1 R/PO-1 R/PO-1 R/PO-1 r-1 r-1 R/PO-1 R/PO-1
FCKSM1 FCKSM0
OSCIOFCN IOL1WAY
reserved reserved
POSCMD1 POSCMD0
bit 7 bit 0
Legend: r = Reserved bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 23-16 Unimplemented: Read as ‘1’
bit 15 IESO: Internal External Switchover bit
1 = IESO mode (Two-Speed Start-up) is enabled
0 = IESO mode (Two-Speed Start-up) is disabled
bit 14-12 PLLDIV<2:0>: 96 MHz PLL Prescaler Select bits
111 = Oscillator input is divided by 12 (48 MHz input)
110 = Oscillator input is divided by 8 (32 MHz input)
101 = Oscillator input is divided by 6 (24 MHz input)
100 = Oscillator input is divided by 5 (20 MHz input)
011 = Oscillator input is divided by 4 (16 MHz input)
010 = Oscillator input is divided by 3 (12 MHz input)
001 = Oscillator input is divided by 2 (8 MHz input)
000 = Oscillator input is used directly (4 MHz input)
bit 11 PLL96MHZ: 96 MHz PLL Start-Up Enable bit
1 = 96 MHz PLL is enabled automatically on start-up
0 = 96 MHz PLL is software controlled (can be enabled by setting the PLLEN bit (CLKDIV<5>))
bit 10-8 FNOSC<2:0>: Initial Oscillator Select bits
111 = Fast RC Oscillator with Postscaler (FRCDIV)
110 = Reserved
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)
010 = Primary Oscillator (XT, HS, EC)
001 = Fast RC Oscillator with Postscaler and PLL module (FRCPLL)
000 = Fast RC Oscillator (FRC)
bit 7-6 FCKSM<1:0>: Clock Switching and Fail-Safe Clock Monitor Configuration bits
1x = Clock switching and Fail-Safe Clock Monitor are disabled
01 = Clock switching is enabled, Fail-Safe Clock Monitor is disabled
00 = Clock switching is enabled, Fail-Safe Clock Monitor is enabled
bit 5 OSCIOFCN: OSCO Pin Configuration bit
If POSCMD<1:0> = 11 or 00:
1 = OSCO/CLKO/RC15 functions as CLKO (FOSC/2)
0 = OSCO/CLKO/RC15 functions as port I/O (RC15)
If POSCMD<1:0> = 10 or 01:
OSCIOFCN has no effect on OSCO/CLKO/RC15.
2010 Microchip Technology Inc. DS39975A-page 327
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bit 4 IOL1WAY: IOLOCK One-Way Set Enable bit
1 = The IOLOCK bit (OSCCON<6>) can be set once, provided the unlock sequence has been
completed. Once set, the Peripheral Pin Select registers cannot be written to a second time.
0 = The IOLOCK bit can be set and cleared as needed, provided the unlock sequence has been
completed
bit 3-2 Reserved: Always maintain as ‘1’
bit 1-0 POSCMD<1:0>: Primary Oscillator Configuration bits
11 = Primary Oscillator is disabled
10 = HS Oscillator mode is selected
01 = XT Oscillator mode is selected
00 = EC Oscillator mode is selected
REGISTER 26-2: CW2: FLASH CONFIGURATION WORD 2 (CONTINUED)
REGISTER 26-3: CW3: FLASH CONFIGURATION WORD 3
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 23 bit 16
R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1
WPEND WPCFG WPDIS ALTPMP(1) WUTSEL1 WUTSEL0 SOSCSEL1 SOSCSEL0
bit 15 bit 8
R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1 R/PO-1
WPFP7 WPFP6 WPFP5 WPFP4 WPFP3 WPFP2 WPFP1 WPFP0
bit 7 bit 0
Legend: PO = Program-Once bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 23-16 Unimplemented: Read as ‘1’
bit 15 WPEND: Segment Write Protection End Page Select bit
1 = Protected code segment upper boundary is at the last page of program memory; the lower
boundary is the code page specified by WPFP<7:0>
0 = Protected code segment lower boundary is at the bottom of the program memory (000000h); upper
boundary is the code page specified by WPFP<7:0>
bit 14 WPCFG: Configuration Word Code Page Write Protection Select bit
1 = Last page (at the top of program memory) and Flash Configuration Words are not write-protected(3)
0 = Last page and Flash Configuration Words are write-protected, provided WPDIS = ‘0’
bit 13 WPDIS: Segment Write Protection Disable bit
1 = Segmented code protection is disabled
0 = Segmented code protection is enabled; protected segment is defined by the WPEND, WPCFG and
WPFPx Configuration bits
bit 12 ALTPMP: Alternate EPMP Pin Mapping bit(1)
1 = EPMP pins are in default location mode
0 = EPMP pins are in alternate location mode
Note 1: Unused in 64-pin devices, maintain at ‘1’.
2: Ensure that the SCLKI pin is made a digital input while using this configuration, see Table 10-2.
3: Regardless of WPCFG status, if WPEND = 1 or if WPFP corresponds to the Configuration Word’s page,
the Configuration Word’s page is protected.
PIC24FJ256GB210 FAMILY
DS39975A-page 328 2010 Microchip Technology Inc.
bit 11-10 WUTSEL<1:0>: Voltage Regulator Standby Mode Wake-up Time Select bits
11 = Default regulator start-up time is used
01 = Fast regulator start-up time is used
x0 = Reserved; do not use
bit 9-8 SOSCSEL<1:0>: SOSC Selection Configuration bits
11 = Secondary oscillator is in Default (high drive strength) Oscillator mode
10 = Reserved; do not use
01 = Secondary oscillator is in Low-Power (low drive strength) Oscillator mode
00 = External clock (SCLKI) or Digital I/O mode(2)
bit 7-0 WPFP<7:0>: Write Protected Code Segment Boundary Page bits
Designates the 512 instruction words page boundary of the protected code segment.
If WPEND = 1:
Specifies the lower page boundary of the code-protected segment; the last page being the last
implemented page in the device.
If WPEND = 0:
Specifies the upper page boundary of the code-protected segment; Page 0 being the lower boundary.
REGISTER 26-3: CW3: FLASH CONFIGURATION WORD 3 (CONTINUED)
Note 1: Unused in 64-pin devices, maintain at ‘1’.
2: Ensure that the SCLKI pin is made a digital input while using this configuration, see Table 10-2.
3: Regardless of WPCFG status, if WPEND = 1 or if WPFP corresponds to the Configuration Word’s page,
the Configuration Word’s page is protected.
REGISTER 26-4: CW4: FLASH CONFIGURATION WORD 4
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 23 bit 16
r-1 r-1 r-1 r-1 r-1 r-1 r-1 r-1
reserved reserved reserved reserved reserved reserved reserved reserved
bit 15 bit 8
r-1 r-1 r-1 r-1 r-1 r-1 r-1 r-1
reserved reserved reserved reserved reserved reserved reserved reserved
bit 7 bit 0
Legend: r = Reserved bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 23-16 Unimplemented: Read as ‘0’
bit 15-0 Reserved: Always maintain as ‘1’
2010 Microchip Technology Inc. DS39975A-page 329
PIC24FJ256GB210 FAMILY
REGISTER 26-5: DEVID: DEVICE ID REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 23 bit 16
RRRRRRRR
FAMID7 FAMID6 FAMID5 FAMID4 FAMID3 FAMID2 FAMID1 FAMID0
bit 15 bit 8
RRRRRRRR
DEV7 DEV6 DEV5 DEV4 DEV3 DEV2 DEV1 DEV0
bit 7 bit 0
Legend: R = Readable bit U = Unimplemented bit
bit 23-16 Unimplemented: Read as ‘1’
bit 15-8 FAMID<7:0>: Device Family Identifier bits
01000001 = PIC24FJ256GB210 family
bit 7-0 DEV<7:0>: Individual Device Identifier bits
00000000 = PIC24FJ128GB206
00000010 = PIC24FJ128GB210
00000100 = PIC24FJ256GB206
00000110 = PIC24FJ256GB210
REGISTER 26-6: DEVREV: DEVICE REVISION REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 23 bit 16
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
U-0 U-0 U-0 U-0 R R R R
— — — — REV3 REV2 REV1 REV0
bit 7 bit 0
Legend: R = Readable bit U = Unimplemented bit
bit 23-4 Unimplemented: Read as ‘0’
bit 3-0 REV<3:0>: Device Revision Identifier bits
PIC24FJ256GB210 FAMILY
DS39975A-page 330 2010 Microchip Technology Inc.
26.2 On-Chip Voltage Regulator
All PIC24FJ256GB210 family devices power their core
digital logic at a nominal 1.8V. This may create an issue
for designs that are required to operate at a higher
typical voltage, such as 3.3V. To simplify system
design, all devices in the PIC24FJ256GB210 family
incorporate an on-chip regulator that allows the device
to run its core logic from VDD.
The regulator is controlled by the ENVREG pin. Tying V
DD
to the pin enables the regulator, which in turn, provides
power to the core from the other V
DD
pins. When the reg-
ulator is enabled, a low-ESR capacitor (such as ceramic)
must be connected to the V
CAP
pin (Figure 26-1). This
helps to maintain the stability of the regulator. The recom-
mended value for the filter capacitor (C
EFC
) is provided in
Section 29.1 “DC Characteristics”
.
26.2.1 VOLTAGE REGULATOR
LOW-VOLTAGE DETECTION
When the on-chip regulator is enabled, it provides a
constant voltage of 1.8V nominal to the digital core
logic.
The regulator can provide this level from a VDD of about
2.1V, all the way up to the device’s VDDMAX. It does not
have the capability to boost VDD levels. In order to pre-
vent “brown-out” conditions when the voltage drops too
low for the regulator, the Brown-out Reset occurs. Then
the regulator output follows VDD with a typical voltage
drop of 300 mV.
To provide information about when the regulator
voltage starts reducing, the on-chip regulator includes
a simple Low-Voltage Detect circuit, which sets the
Low-Voltage Detect Interrupt Flag, LVDIF (IFS4<8>).
This can be used to generate an interrupt to trigger an
orderly shutdown.
FIGURE 26-1: CONNECTIONS FOR THE
ON-CHIP REGULATOR
26.2.2 ON-CHIP REGULATOR AND POR
When the voltage regulator is enabled, it takes approx-
imately 10 s for it to generate output. During this time,
designated as TVREG, code execution is disabled.
TVREG is applied every time the device resumes
operation after any power-down, including Sleep mode.
TVREG is determined by the status of the VREGS bit
(RCON<8>) and the WUTSEL Configuration bits
(CW3<11:10>). Refer to Section 29.0 “Electrical
Characteristics” for more information on TVREG.
26.2.3 ON-CHIP REGULATOR AND BOR
When the on-chip regulator is enabled,
PIC24FJ256GB210 family devices also have a simple
brown-out capability. If the voltage supplied to the reg-
ulator is inadequate to maintain the output level, the
regulator Reset circuitry will generate a Brown-out
Reset. This event is captured by the BOR (RCON<1>)
flag bit. The brown-out voltage specifications are
provided in Section 7. “Reset” (DS39712) in the
“PIC24F Family Reference Manual”.
26.2.4 VOLTAGE REGULATOR STANDBY
MODE
When enabled, the on-chip regulator always consumes
a small incremental amount of current over IDD/IPD,
including when the device is in Sleep mode, even
though the core digital logic does not require power. To
provide additional savings in applications where power
resources are critical, the regulator can be made to
enter Standby mode on its own whenever the device
goes into Sleep mode. This feature is controlled by the
VREGS bit (RCON<8>). Clearing the VREGS bit
enables the Standby mode. When waking up from
Standby mode, the regulator needs to wait for TVREG to
expire before wake-up.
The regulator wake-up time required for Standby
mode is controlled by the WUTSEL<1:0>
(CW3<11:10>) Configuration bits. The regulator
wake-up time is lower when WUTSEL<1:0> = 01, and
higher when WUTSEL<1:0> = 11. Refer to the TVREG
specification in Table 29-10 for regulator wake-up
time.
When the regulator’s Standby mode is turned off
(VREGS = 1), the device wakes up without waiting for
TVREG. However, with the VREGS bit set, the power
consumption while in Sleep mode will be approximately
40 A higher than what it would be if the regulator was
allowed to enter Standby mode.
VDD
ENVREG
VCAP
VSS
PIC24FJXXXGB2XX
CEFC
3.3V(1)
Regulator Enabled (ENVREG tied to VDD):
Note 1: This is a typical operating voltage. Refer to
Section 29.1 “DC Characteristics” for
the full operating ranges of VDD.
(10 F typ)
Note: For more information, see Section 29.0
“Electrical Characteristics”. The infor-
mation in this data sheet supersedes the
information in the FRM.
2010 Microchip Technology Inc. DS39975A-page 331
PIC24FJ256GB210 FAMILY
26.3 Watchdog Timer (WDT)
For PIC24FJ256GB210 family devices, the WDT is
driven by the LPRC oscillator. When the WDT is
enabled, the clock source is also enabled.
The nominal WDT clock source from LPRC is 31 kHz.
This feeds a prescaler that can be configured for either
5-bit (divide-by-32) or 7-bit (divide-by-128) operation.
The prescaler is set by the FWPSA Configuration bit.
With a 31 kHz input, the prescaler yields a nominal
WDT Time-out period (TWDT) of 1 ms in 5-bit mode or
4 ms in 7-bit mode.
A variable postscaler divides down the WDT prescaler
output and allows for a wide range of time-out periods.
The postscaler is controlled by the WDTPS<3:0> Con-
figuration bits (CW1<3:0>), which allows the selection
of a total of 16 settings, from 1:1 to 1:32,768. Using the
prescaler and postscaler time-out periods, ranging
from 1 ms to 131 seconds, can be achieved.
The WDT, prescaler and postscaler are reset:
• On any device Reset
• On the completion of a clock switch, whether
invoked by software (i.e., setting the OSWEN bit
after changing the NOSC bits) or by hardware
(i.e., Fail-Safe Clock Monitor)
• When a PWRSAV instruction is executed
(i.e., Sleep or Idle mode is entered)
• When the device exits Sleep or Idle mode to
resume normal operation
•By a CLRWDT instruction during normal execution
If the WDT is enabled, it will continue to run during
Sleep or Idle modes. When the WDT time-out occurs,
the device will wake the device and code execution will
continue from where the PWRSAV instruction was
executed. The corresponding SLEEP or IDLE
(RCON<3:2>) bit will need to be cleared in software
after the device wakes up.
The WDT Flag bit, WDTO (RCON<4>), is not auto-
matically cleared following a WDT time-out. To detect
subsequent WDT events, the flag must be cleared in
software.
26.3.1 WINDOWED OPERATION
The Watchdog Timer has an optional Fixed-Window
mode of operation. In this Windowed mode, CLRWDT
instructions can only reset the WDT during the last 1/4
of the programmed WDT period. A CLRWDT instruction
executed before that window causes a WDT Reset,
similar to a WDT time-out.
Windowed WDT mode is enabled by programming the
WINDIS Configuration bit (CW1<6>) to ‘0’.
26.3.2 CONTROL REGISTER
The WDT is enabled or disabled by the FWDTEN
Configuration bit. When the FWDTEN Configuration bit
is set, the WDT is always enabled.
The WDT can be optionally controlled in software when
the FWDTEN Configuration bit has been programmed
to ‘0’. The WDT is enabled in software by setting the
SWDTEN Control bit (RCON<5>). The SWDTEN
control bit is cleared on any device Reset. The software
WDT option allows the user to enable the WDT for
critical code segments and disable the WDT during
non-critical segments for maximum power savings.
FIGURE 26-2: WDT BLOCK DIAGRAM
Note: The CLRWDT and PWRSAV instructions
clear the prescaler and postscaler counts
when executed.
LPRC Input WDT Overflow
Wake from Sleep
31 kHz
Prescaler Postscaler
FWPSA
SWDTEN
FWDTEN
Reset
All Device Resets
Sleep or Idle Mode
LPRC Control
CLRWDT Instr.
PWRSAV Instr.
(5-bit/7-bit) 1:1 to 1:32.768
WDTPS<3:0>
1 ms/4 ms
Exit Sleep or
Idle Mode
WDT
Counter
Transition to
New Clock Source
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DS39975A-page 332 2010 Microchip Technology Inc.
26.4 Program Verification and
Code Protection
PIC24FJ256GB210 family devices provide two compli-
mentary methods to protect application code from
overwrites and erasures. These also help to protect the
device from inadvertent configuration changes during
run time.
26.4.1 GENERAL SEGMENT PROTECTION
For all devices in the PIC24FJ256GB210 family, the
on-chip program memory space is treated as a single
block, known as the General Segment (GS). Code pro-
tection for this block is controlled by one Configuration
bit, GCP. This bit inhibits external reads and writes to
the program memory space. It has no direct effect in
normal execution mode.
Write protection is controlled by the GWRP bit in the
Configuration Word. When GWRP is programmed to
‘0’, internal write and erase operations to program
memory are blocked.
26.4.2 CODE SEGMENT PROTECTION
In addition to global General Segment protection, a
separate subrange of the program memory space can
be individually protected against writes and erases.
This area can be used for many purposes where a sep-
arate block of write and erase-protected code is
needed, such as bootloader applications. Unlike
common boot block implementations, the specially
protected segment in the PIC24FJ256GB210 family
devices can be located by the user anywhere in the
program space and configured in a wide range of sizes.
Code segment protection provides an added level of
protection to a designated area of program memory by
disabling the NVM safety interlock whenever a write or
erase address falls within a specified range. It does not
override General Segment protection controlled by the
GCP or GWRP bits. For example, if GCP and GWRP
are enabled, enabling segmented code protection for
the bottom half of program memory does not undo the
General Segment protection for the top half.
The size and type of protection for the segmented code
range are configured by the WPFPx, WPEND, WPCFG
and WPDIS bits in Configuration Word 3. Code seg-
ment protection is enabled by programming the WPDIS
bit (= 0). The WPFP bits specify the size of the segment
to be protected by specifying the 512-word code page
that is the start or end of the protected segment. The
specified region is inclusive, therefore, this page will
also be protected.
The WPEND bit determines if the protected segment
uses the top or bottom of the program space as a
boundary. Programming WPEND (= 0) sets the bottom
of program memory (000000h) as the lower boundary
of the protected segment. Leaving WPEND unpro-
grammed (= 1) protects the specified page through the
last page of implemented program memory, including
the Configuration Word locations.
A separate bit, WPCFG, is used to protect the last page
of program space, including the Flash Configuration
Words. Programming WPCFG (= 0) protects the last
page in addition to the pages selected by the WPEND
and WPFP<7:0> bits setting. This is useful in circum-
stances where write protection is needed for both the
code segment in the bottom of the memory and the
Flash Configuration Words.
The various options for segment code protection are
shown in Table 26-2.
2010 Microchip Technology Inc. DS39975A-page 333
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26.4.3 CONFIGURATION REGISTER
PROTECTION
The Configuration registers are protected against
inadvertent or unwanted changes or reads in two ways.
The primary protection method is the same as that of
the RP registers – shadow registers contain a compli-
mentary value which is constantly compared with the
actual value.
To safeguard against unpredictable events, Configura-
tion bit changes resulting from individual cell level
disruptions (such as ESD events) will cause a parity
error and trigger a device Reset.
The data for the Configuration registers is derived from
the Flash Configuration Words in program memory.
When the GCP bit is set, the source data for device
configuration is also protected as a consequence. Even
if General Segment protection is not enabled, the
device configuration can be protected by using the
appropriate code segment protection setting.
TABLE 26-2: CODE SEGMENT PROTECTION CONFIGURATION OPTIONS
26.5 JTAG Interface
PIC24FJ256GB210 family devices implement a JTAG
interface, which supports boundary scan device
testing.
26.6 In-Circuit Serial Programming™
PIC24FJ256GB210 family microcontrollers can be
serially programmed while in the end application circuit.
This is simply done with two lines for clock (PGECx)
and data (PGEDx), and three other lines for power
(VDD), ground (VSS) and MCLR. This allows customers
to manufacture boards with unprogrammed devices
and then program the microcontroller just before
shipping the product. This also allows the most recent
firmware or a custom firmware to be programmed.
26.7 In-Circuit Debugger
When MPLAB® ICD 3 is selected as a debugger, the
in-circuit debugging functionality is enabled. This func-
tion allows simple debugging functions when used with
MPLAB IDE. Debugging functionality is controlled
through the PGECx (Emulation/Debug Clock) and
PGEDx (Emulation/Debug Data) pins.
To use the in-circuit debugger function of the device,
the design must implement ICSP connections to
MCLR, VDD, VSS and the PGECx/PGEDx pin pair des-
ignated by the ICS Configuration bits. In addition, when
the feature is enabled, some of the resources are not
available for general use. These resources include the
first 80 bytes of data RAM and two I/O pins.
Segment Configuration Bits
Write/Erase Protection of Code Segment
WPDIS WPEND WPCFG
1XxNo additional protection is enabled; all program memory protection is configured
by GCP and GWRP.
01xAddresses from the first address of the code page are defined by WPFP<7:0>
through the end of implemented program memory (inclusive), write/erase
protected, including Flash Configuration Words.
001Address 000000h through the last address of the code page is defined by
WPFP<7:0> (inclusive), write/erase protected.
000Address 000000h through the last address of code page is defined by
WPFP<7:0> (inclusive), write/erase protected and the last page, including Flash
Configuration Words are write/erase protected.
PIC24FJ256GB210 FAMILY
DS39975A-page 334 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 335
PIC24FJ256GB210 FAMILY
27.0 DEVELOPMENT SUPPORT
The PIC® microcontrollers and dsPIC® digital signal
controllers are supported with a full range of software
and hardware development tools:
• Integrated Development Environment
- MPLAB® IDE Software
• Compilers/Assemblers/Linkers
- MPLAB C Compiler for Various Device
Families
- HI-TECH C for Various Device Families
- MPASMTM Assembler
-MPLINK
TM Object Linker/
MPLIBTM Object Librarian
- MPLAB Assembler/Linker/Librarian for
Various Device Families
• Simulators
- MPLAB SIM Software Simulator
•Emulators
- MPLAB REAL ICE™ In-Circuit Emulator
• In-Circuit Debuggers
- MPLAB ICD 3
- PICkit™ 3 Debug Express
• Device Programmers
- PICkit™ 2 Programmer
- MPLAB PM3 Device Programmer
• Low-Cost Demonstration/Development Boards,
Evaluation Kits, and Starter Kits
27.1 MPLAB Integrated Development
Environment Software
The MPLAB IDE software brings an ease of software
development previously unseen in the 8/16/32-bit
microcontroller market. The MPLAB IDE is a Windows®
operating system-based application that contains:
• A single graphical interface to all debugging tools
- Simulator
- Programmer (sold separately)
- In-Circuit Emulator (sold separately)
- In-Circuit Debugger (sold separately)
• A full-featured editor with color-coded context
• A multiple project manager
• Customizable data windows with direct edit of
contents
• High-level source code debugging
• Mouse over variable inspection
• Drag and drop variables from source to watch
windows
• Extensive on-line help
• Integration of select third party tools, such as
IAR C Compilers
The MPLAB IDE allows you to:
• Edit your source files (either C or assembly)
• One-touch compile or assemble, and download to
emulator and simulator tools (automatically
updates all project information)
• Debug using:
- Source files (C or assembly)
- Mixed C and assembly
- Machine code
MPLAB IDE supports multiple debugging tools in a
single development paradigm, from the cost-effective
simulators, through low-cost in-circuit debuggers, to
full-featured emulators. This eliminates the learning
curve when upgrading to tools with increased flexibility
and power.
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DS39975A-page 336 2010 Microchip Technology Inc.
27.2 MPLAB C Compilers for Various
Device Families
The MPLAB C Compiler code development systems
are complete ANSI C compilers for Microchip’s PIC18,
PIC24 and PIC32 families of microcontrollers and the
dsPIC30 and dsPIC33 families of digital signal control-
lers. These compilers provide powerful integration
capabilities, superior code optimization and ease of
use.
For easy source level debugging, the compilers provide
symbol information that is optimized to the MPLAB IDE
debugger.
27.3 HI-TECH C for Various Device
Families
The HI-TECH C Compiler code development systems
are complete ANSI C compilers for Microchip’s PIC
family of microcontrollers and the dsPIC family of digital
signal controllers. These compilers provide powerful
integration capabilities, omniscient code generation
and ease of use.
For easy source level debugging, the compilers provide
symbol information that is optimized to the MPLAB IDE
debugger.
The compilers include a macro assembler, linker, pre-
processor, and one-step driver, and can run on multiple
platforms.
27.4 MPASM Assembler
The MPASM Assembler is a full-featured, universal
macro assembler for PIC10/12/16/18 MCUs.
The MPASM Assembler generates relocatable object
files for the MPLINK Object Linker, Intel® standard HEX
files, MAP files to detail memory usage and symbol
reference, absolute LST files that contain source lines
and generated machine code and COFF files for
debugging.
The MPASM Assembler features include:
• Integration into MPLAB IDE projects
• User-defined macros to streamline
assembly code
• Conditional assembly for multi-purpose
source files
• Directives that allow complete control over the
assembly process
27.5 MPLINK Object Linker/
MPLIB Object Librarian
The MPLINK Object Linker combines relocatable
objects created by the MPASM Assembler and the
MPLAB C18 C Compiler. It can link relocatable objects
from precompiled libraries, using directives from a
linker script.
The MPLIB Object Librarian manages the creation and
modification of library files of precompiled code. When
a routine from a library is called from a source file, only
the modules that contain that routine will be linked in
with the application. This allows large libraries to be
used efficiently in many different applications.
The object linker/library features include:
• Efficient linking of single libraries instead of many
smaller files
• Enhanced code maintainability by grouping
related modules together
• Flexible creation of libraries with easy module
listing, replacement, deletion and extraction
27.6 MPLAB Assembler, Linker and
Librarian for Various Device
Families
MPLAB Assembler produces relocatable machine
code from symbolic assembly language for PIC24,
PIC32 and dsPIC devices. MPLAB C Compiler uses
the assembler to produce its object file. The assembler
generates relocatable object files that can then be
archived or linked with other relocatable object files and
archives to create an executable file. Notable features
of the assembler include:
• Support for the entire device instruction set
• Support for fixed-point and floating-point data
• Command line interface
• Rich directive set
• Flexible macro language
• MPLAB IDE compatibility
2010 Microchip Technology Inc. DS39975A-page 337
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27.7 MPLAB SIM Software Simulator
The MPLAB SIM Software Simulator allows code
development in a PC-hosted environment by simulat-
ing the PIC MCUs and dsPIC® DSCs on an instruction
level. On any given instruction, the data areas can be
examined or modified and stimuli can be applied from
a comprehensive stimulus controller. Registers can be
logged to files for further run-time analysis. The trace
buffer and logic analyzer display extend the power of
the simulator to record and track program execution,
actions on I/O, most peripherals and internal registers.
The MPLAB SIM Software Simulator fully supports
symbolic debugging using the MPLAB C Compilers,
and the MPASM and MPLAB Assemblers. The soft-
ware simulator offers the flexibility to develop and
debug code outside of the hardware laboratory envi-
ronment, making it an excellent, economical software
development tool.
27.8 MPLAB REAL ICE In-Circuit
Emulator System
MPLAB REAL ICE In-Circuit Emulator System is
Microchip’s next generation high-speed emulator for
Microchip Flash DSC and MCU devices. It debugs and
programs PIC® Flash MCUs and dsPIC® Flash DSCs
with the easy-to-use, powerful graphical user interface of
the MPLAB Integrated Development Environment (IDE),
included with each kit.
The emulator is connected to the design engineer’s PC
using a high-speed USB 2.0 interface and is connected
to the target with either a connector compatible with
in-circuit debugger systems (RJ11) or with the new
high-speed, noise tolerant, Low-Voltage Differential Sig-
nal (LVDS) interconnection (CAT5).
The emulator is field upgradable through future firmware
downloads in MPLAB IDE. In upcoming releases of
MPLAB IDE, new devices will be supported, and new
features will be added. MPLAB REAL ICE offers signifi-
cant advantages over competitive emulators including
low-cost, full-speed emulation, run-time variable
watches, trace analysis, complex breakpoints, a rugge-
dized probe interface and long (up to three meters) inter-
connection cables.
27.9 MPLAB ICD 3 In-Circuit Debugger
System
MPLAB ICD 3 In-Circuit Debugger System is Micro-
chip’s most cost effective high-speed hardware
debugger/programmer for Microchip Flash Digital Sig-
nal Controller (DSC) and microcontroller (MCU)
devices. It debugs and programs PIC® Flash microcon-
trollers and dsPIC® DSCs with the powerful, yet
easy-to-use graphical user interface of MPLAB Inte-
grated Development Environment (IDE).
The MPLAB ICD 3 In-Circuit Debugger probe is con-
nected to the design engineer’s PC using a high-speed
USB 2.0 interface and is connected to the target with a
connector compatible with the MPLAB ICD 2 or MPLAB
REAL ICE systems (RJ-11). MPLAB ICD 3 supports all
MPLAB ICD 2 headers.
27.10 PICkit 3 In-Circuit
Debugger/Programmer and
PICkit 3 Debug Express
The MPLAB PICkit 3 allows debugging and program-
ming of PIC® and dsPIC® Flash microcontrollers at a
most affordable price point using the powerful graphical
user interface of the MPLAB Integrated Development
Environment (IDE). The MPLAB PICkit 3 is connected
to the design engineer’s PC using a full speed USB
interface and can be connected to the target via an
Microchip debug (RJ-11) connector (compatible with
MPLAB ICD 3 and MPLAB REAL ICE). The connector
uses two device I/O pins and the reset line to imple-
ment in-circuit debugging and In-Circuit Serial Pro-
gramming™.
The PICkit 3 Debug Express include the PICkit 3, demo
board and microcontroller, hookup cables and CDROM
with user’s guide, lessons, tutorial, compiler and
MPLAB IDE software.
PIC24FJ256GB210 FAMILY
DS39975A-page 338 2010 Microchip Technology Inc.
27.11 PICkit 2 Development
Programmer/Debugger and
PICkit 2 Debug Express
The PICkit™ 2 Development Programmer/Debugger is
a low-cost development tool with an easy to use inter-
face for programming and debugging Microchip’s Flash
families of microcontrollers. The full featured
Windows® programming interface supports baseline
(PIC10F, PIC12F5xx, PIC16F5xx), midrange
(PIC12F6xx, PIC16F), PIC18F, PIC24, dsPIC30,
dsPIC33, and PIC32 families of 8-bit, 16-bit, and 32-bit
microcontrollers, and many Microchip Serial EEPROM
products. With Microchip’s powerful MPLAB Integrated
Development Environment (IDE) the PICkit™ 2
enables in-circuit debugging on most PIC® microcon-
trollers. In-Circuit-Debugging runs, halts and single
steps the program while the PIC microcontroller is
embedded in the application. When halted at a break-
point, the file registers can be examined and modified.
The PICkit 2 Debug Express include the PICkit 2, demo
board and microcontroller, hookup cables and CDROM
with user’s guide, lessons, tutorial, compiler and
MPLAB IDE software.
27.12 MPLAB PM3 Device Programmer
The MPLAB PM3 Device Programmer is a universal,
CE compliant device programmer with programmable
voltage verification at VDDMIN and VDDMAX for
maximum reliability. It features a large LCD display
(128 x 64) for menus and error messages and a modu-
lar, detachable socket assembly to support various
package types. The ICSP™ cable assembly is included
as a standard item. In Stand-Alone mode, the MPLAB
PM3 Device Programmer can read, verify and program
PIC devices without a PC connection. It can also set
code protection in this mode. The MPLAB PM3
connects to the host PC via an RS-232 or USB cable.
The MPLAB PM3 has high-speed communications and
optimized algorithms for quick programming of large
memory devices and incorporates an MMC card for file
storage and data applications.
27.13 Demonstration/Development
Boards, Evaluation Kits, and
Starter Kits
A wide variety of demonstration, development and
evaluation boards for various PIC MCUs and dsPIC
DSCs allows quick application development on fully func-
tional systems. Most boards include prototyping areas for
adding custom circuitry and provide application firmware
and source code for examination and modification.
The boards support a variety of features, including LEDs,
temperature sensors, switches, speakers, RS-232
interfaces, LCD displays, potentiometers and additional
EEPROM memory.
The demonstration and development boards can be
used in teaching environments, for prototyping custom
circuits and for learning about various microcontroller
applications.
In addition to the PICDEM™ and dsPICDEM™ demon-
stration/development board series of circuits, Microchip
has a line of evaluation kits and demonstration software
for analog filter design, KEELOQ® security ICs, CAN,
IrDA®, PowerSmart battery management, SEEVAL®
evaluation system, Sigma-Delta ADC, flow rate
sensing, plus many more.
Also available are starter kits that contain everything
needed to experience the specified device. This usually
includes a single application and debug capability, all
on one board.
Check the Microchip web page (www.microchip.com)
for the complete list of demonstration, development
and evaluation kits.
2010 Microchip Technology Inc. DS39975A-page 339
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28.0 INSTRUCTION SET SUMMARY
The PIC24F instruction set adds many enhancements
to the previous PIC® MCU instruction sets, while main-
taining an easy migration from previous PIC MCU
instruction sets. Most instructions are a single program
memory word. Only three instructions require two
program memory locations.
Each single-word instruction is a 24-bit word divided
into an 8-bit opcode, which specifies the instruction
type and one or more operands, which further specify
the operation of the instruction. The instruction set is
highly orthogonal and is grouped into four basic
categories:
• Word or byte-oriented operations
• Bit-oriented operations
• Literal operations
• Control operations
Table 28-1 shows the general symbols used in
describing the instructions. The PIC24F instruction set
summary in Table 28-2 lists all the instructions, along
with the status flags affected by each instruction.
Most word or byte-oriented W register instructions
(including barrel shift instructions) have three
operands:
• The first source operand which is typically a
register ‘Wb’ without any address modifier
• The second source operand which is typically a
register ‘Ws’ with or without an address modifier
• The destination of the result which is typically a
register ‘Wd’ with or without an address modifier
However, word or byte-oriented file register instructions
have two operands:
• The file register specified by the value, ‘f’
• The destination, which could either be the file
register, ‘f’, or the W0 register, which is denoted
as ‘WREG’
Most bit-oriented instructions (including simple
rotate/shift instructions) have two operands:
• The W register (with or without an address
modifier) or file register (specified by the value of
‘Ws’ or ‘f’)
• The bit in the W register or file register
(specified by a literal value or indirectly by the
contents of register, ‘Wb’)
The literal instructions that involve data movement may
use some of the following operands:
• A literal value to be loaded into a W register or file
register (specified by the value of ‘k’)
• The W register or file register where the literal
value is to be loaded (specified by ‘Wb’ or ‘f’)
However, literal instructions that involve arithmetic or
logical operations use some of the following operands:
• The first source operand which is a register ‘Wb’
without any address modifier
• The second source operand which is a literal
value
• The destination of the result (only if not the same
as the first source operand), which is typically a
register ‘Wd’ with or without an address modifier
The control instructions may use some of the following
operands:
• A program memory address
• The mode of the table read and table write
instructions
All instructions are a single word, except for certain
double-word instructions, which were made
double-word instructions so that all the required infor-
mation is available in these 48 bits. In the second word,
the 8 MSbs are ‘0’s. If this second word is executed as
an instruction (by itself), it will execute as a NOP.
Most single-word instructions are executed in a single
instruction cycle, unless a conditional test is true or the
program counter is changed as a result of the instruc-
tion. In these cases, the execution takes two instruction
cycles, with the additional instruction cycle(s) executed
as a NOP. Notable exceptions are the BRA (uncondi-
tional/computed branch), indirect CALL/GOTO, all table
reads and writes, and RETURN/RETFIE instructions,
which are single-word instructions but take two or three
cycles.
Certain instructions that involve skipping over the sub-
sequent instruction require either two or three cycles if
the skip is performed, depending on whether the
instruction being skipped is a single-word or two-word
instruction. Moreover, double-word moves require two
cycles. The double-word instructions execute in two
instruction cycles.
Note: This chapter is a brief summary of the
PIC24F instruction set architecture and is
not intended to be a comprehensive
reference source.
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DS39975A-page 340 2010 Microchip Technology Inc.
TABLE 28-1: SYMBOLS USED IN OPCODE DESCRIPTIONS
Field Description
#text Means literal defined by “text”
(text) Means “content of text”
[text] Means “the location addressed by text”
{ } Optional field or operation
<n:m> Register bit field
.b Byte mode selection
.d Double-Word mode selection
.S Shadow register select
.w Word mode selection (default)
bit4 4-bit bit selection field (used in word addressed instructions) {0...15}
C, DC, N, OV, Z MCU Status bits: Carry, Digit Carry, Negative, Overflow, Sticky Zero
Expr Absolute address, label or expression (resolved by the linker)
f File register address {0000h...1FFFh}
lit1 1-bit unsigned literal {0,1}
lit4 4-bit unsigned literal {0...15}
lit5 5-bit unsigned literal {0...31}
lit8 8-bit unsigned literal {0...255}
lit10 10-bit unsigned literal {0...255} for Byte mode, {0:1023} for Word mode
lit14 14-bit unsigned literal {0...16383}
lit16 16-bit unsigned literal {0...65535}
lit23 23-bit unsigned literal {0...8388607}; LSB must be ‘0’
None Field does not require an entry, may be blank
PC Program Counter
Slit10 10-bit signed literal {-512...511}
Slit16 16-bit signed literal {-32768...32767}
Slit6 6-bit signed literal {-16...16}
Wb Base W register {W0..W15}
Wd Destination W register { Wd, [Wd], [Wd++], [Wd--], [++Wd], [--Wd] }
Wdo Destination W register
{ Wnd, [Wnd], [Wnd++], [Wnd--], [++Wnd], [--Wnd], [Wnd+Wb] }
Wm,Wn Dividend, Divisor working register pair (direct addressing)
Wn One of 16 working registers {W0..W15}
Wnd One of 16 destination working registers {W0..W15}
Wns One of 16 source working registers {W0..W15}
WREG W0 (working register used in file register instructions)
Ws Source W register { Ws, [Ws], [Ws++], [Ws--], [++Ws], [--Ws] }
Wso Source W register { Wns, [Wns], [Wns++], [Wns--], [++Wns], [--Wns], [Wns+Wb] }
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TABLE 28-2: INSTRUCTION SET OVERVIEW
Assembly
Mnemonic Assembly Syntax Description # of
Words
# of
Cycles
Status Flags
Affected
ADD ADD f f = f + WREG 1 1 C, DC, N, OV, Z
ADD f,WREG WREG = f + WREG 1 1 C, DC, N, OV, Z
ADD #lit10,Wn Wd = lit10 + Wd 1 1 C, DC, N, OV, Z
ADD Wb,Ws,Wd Wd = Wb + Ws 1 1 C, DC, N, OV, Z
ADD Wb,#lit5,Wd Wd = Wb + lit5 1 1 C, DC, N, OV, Z
ADDC ADDC f f = f + WREG + (C) 1 1 C, DC, N, OV, Z
ADDC f,WREG WREG = f + WREG + (C) 1 1 C, DC, N, OV, Z
ADDC #lit10,Wn Wd = lit10 + Wd + (C) 1 1 C, DC, N, OV, Z
ADDC Wb,Ws,Wd Wd = Wb + Ws + (C) 1 1 C, DC, N, OV, Z
ADDC Wb,#lit5,Wd Wd = Wb + lit5 + (C) 1 1 C, DC, N, OV, Z
AND AND f f = f .AND. WREG 1 1 N, Z
AND f,WREG WREG = f .AND. WREG 1 1 N, Z
AND #lit10,Wn Wd = lit10 .AND. Wd 1 1 N, Z
AND Wb,Ws,Wd Wd = Wb .AND. Ws 1 1 N, Z
AND Wb,#lit5,Wd Wd = Wb .AND. lit5 1 1 N, Z
ASR ASR f f = Arithmetic Right Shift f 1 1 C, N, OV, Z
ASR f,WREG WREG = Arithmetic Right Shift f 1 1 C, N, OV, Z
ASR Ws,Wd Wd = Arithmetic Right Shift Ws 1 1 C, N, OV, Z
ASR Wb,Wns,Wnd Wnd = Arithmetic Right Shift Wb by Wns 1 1 N, Z
ASR Wb,#lit5,Wnd Wnd = Arithmetic Right Shift Wb by lit5 1 1 N, Z
BCLR BCLR f,#bit4 Bit Clear f 1 1 None
BCLR Ws,#bit4 Bit Clear Ws 1 1 None
BRA BRA C,Expr Branch if Carry 1 1 (2) None
BRA GE,Expr Branch if Greater than or Equal 1 1 (2) None
BRA GEU,Expr Branch if Unsigned Greater than or Equal 1 1 (2) None
BRA GT,Expr Branch if Greater than 1 1 (2) None
BRA GTU,Expr Branch if Unsigned Greater than 1 1 (2) None
BRA LE,Expr Branch if Less than or Equal 1 1 (2) None
BRA LEU,Expr Branch if Unsigned Less than or Equal 1 1 (2) None
BRA LT,Expr Branch if Less than 1 1 (2) None
BRA LTU,Expr Branch if Unsigned Less than 1 1 (2) None
BRA N,Expr Branch if Negative 1 1 (2) None
BRA NC,Expr Branch if Not Carry 1 1 (2) None
BRA NN,Expr Branch if Not Negative 1 1 (2) None
BRA NOV,Expr Branch if Not Overflow 1 1 (2) None
BRA NZ,Expr Branch if Not Zero 1 1 (2) None
BRA OV,Expr Branch if Overflow 1 1 (2) None
BRA Expr Branch Unconditionally 1 2 None
BRA Z,Expr Branch if Zero 1 1 (2) None
BRA Wn Computed Branch 1 2 None
BSET BSET f,#bit4 Bit Set f 1 1 None
BSET Ws,#bit4 Bit Set Ws 1 1 None
BSW BSW.C Ws,Wb Write C bit to Ws<Wb> 1 1 None
BSW.Z Ws,Wb Write Z bit to Ws<Wb> 1 1 None
BTG BTG f,#bit4 Bit Toggle f 1 1 None
BTG Ws,#bit4 Bit Toggle Ws 1 1 None
BTSC BTSC f,#bit4 Bit Test f, Skip if Clear 1 1
(2 or 3)
None
BTSC Ws,#bit4 Bit Test Ws, Skip if Clear 1 1
(2 or 3)
None
PIC24FJ256GB210 FAMILY
DS39975A-page 342 2010 Microchip Technology Inc.
BTSS BTSS f,#bit4 Bit Test f, Skip if Set 1 1
(2 or 3)
None
BTSS Ws,#bit4 Bit Test Ws, Skip if Set 1 1
(2 or 3)
None
BTST BTST f,#bit4 Bit Test f 1 1 Z
BTST.C Ws,#bit4 Bit Test Ws to C 1 1 C
BTST.Z Ws,#bit4 Bit Test Ws to Z 1 1 Z
BTST.C Ws,Wb Bit Test Ws<Wb> to C 1 1 C
BTST.Z Ws,Wb Bit Test Ws<Wb> to Z 1 1 Z
BTSTS BTSTS f,#bit4 Bit Test then Set f 1 1 Z
BTSTS.C Ws,#bit4 Bit Test Ws to C, then Set 1 1 C
BTSTS.Z Ws,#bit4 Bit Test Ws to Z, then Set 1 1 Z
CALL CALL lit23 Call Subroutine 2 2 None
CALL Wn Call Indirect Subroutine 1 2 None
CLR CLR f f = 0x0000 1 1 None
CLR WREG WREG = 0x0000 1 1 None
CLR Ws Ws = 0x0000 1 1 None
CLRWDT CLRWDT Clear Watchdog Timer 1 1 WDTO, Sleep
COM COM f f = f 11N, Z
COM f,WREG WREG = f 11N, Z
COM Ws,Wd Wd = Ws 11N, Z
CP CP f Compare f with WREG 1 1 C, DC, N, OV, Z
CP Wb,#lit5 Compare Wb with lit5 1 1 C, DC, N, OV, Z
CP Wb,Ws Compare Wb with Ws (Wb – Ws) 1 1 C, DC, N, OV, Z
CP0 CP0 f Compare f with 0x0000 1 1 C, DC, N, OV, Z
CP0 Ws Compare Ws with 0x0000 1 1 C, DC, N, OV, Z
CPB CPB f Compare f with WREG, with Borrow 1 1 C, DC, N, OV, Z
CPB Wb,#lit5 Compare Wb with lit5, with Borrow 1 1 C, DC, N, OV, Z
CPB Wb,Ws Compare Wb with Ws, with Borrow
(Wb – Ws – C)
1 1 C, DC, N, OV, Z
CPSEQ CPSEQ Wb,Wn Compare Wb with Wn, Skip if = 1 1
(2 or 3)
None
CPSGT CPSGT Wb,Wn Compare Wb with Wn, Skip if > 1 1
(2 or 3)
None
CPSLT CPSLT Wb,Wn Compare Wb with Wn, Skip if < 1 1
(2 or 3)
None
CPSNE CPSNE Wb,Wn Compare Wb with Wn, Skip if 11
(2 or 3)
None
DAW DAW.B Wn Wn = Decimal Adjust Wn 1 1 C
DEC DEC f f = f –1 1 1 C, DC, N, OV, Z
DEC f,WREG WREG = f –1 1 1 C, DC, N, OV, Z
DEC Ws,Wd Wd = Ws – 1 1 1 C, DC, N, OV, Z
DEC2 DEC2 f f = f – 2 1 1 C, DC, N, OV, Z
DEC2 f,WREG WREG = f – 2 1 1 C, DC, N, OV, Z
DEC2 Ws,Wd Wd = Ws – 2 1 1 C, DC, N, OV, Z
DISI DISI #lit14 Disable Interrupts for k Instruction Cycles 1 1 None
DIV DIV.SW Wm,Wn Signed 16/16-bit Integer Divide 1 18 N, Z, C, OV
DIV.SD Wm,Wn Signed 32/16-bit Integer Divide 1 18 N, Z, C, OV
DIV.UW Wm,Wn Unsigned 16/16-bit Integer Divide 1 18 N, Z, C, OV
DIV.UD Wm,Wn Unsigned 32/16-bit Integer Divide 1 18 N, Z, C, OV
EXCH EXCH Wns,Wnd Swap Wns with Wnd 1 1 None
FF1L FF1L Ws,Wnd Find First One from Left (MSb) Side 1 1 C
FF1R FF1R Ws,Wnd Find First One from Right (LSb) Side 1 1 C
TABLE 28-2: INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic Assembly Syntax Description # of
Words
# of
Cycles
Status Flags
Affected
2010 Microchip Technology Inc. DS39975A-page 343
PIC24FJ256GB210 FAMILY
GOTO GOTO Expr Go to Address 2 2 None
GOTO Wn Go to Indirect 1 2 None
INC INC f f = f + 1 1 1 C, DC, N, OV, Z
INC f,WREG WREG = f + 1 1 1 C, DC, N, OV, Z
INC Ws,Wd Wd = Ws + 1 1 1 C, DC, N, OV, Z
INC2 INC2 f f = f + 2 1 1 C, DC, N, OV, Z
INC2 f,WREG WREG = f + 2 1 1 C, DC, N, OV, Z
INC2 Ws,Wd Wd = Ws + 2 1 1 C, DC, N, OV, Z
IOR IOR f f = f .IOR. WREG 1 1 N, Z
IOR f,WREG WREG = f .IOR. WREG 1 1 N, Z
IOR #lit10,Wn Wd = lit10 .IOR. Wd 1 1 N, Z
IOR Wb,Ws,Wd Wd = Wb .IOR. Ws 1 1 N, Z
IOR Wb,#lit5,Wd Wd = Wb .IOR. lit5 1 1 N, Z
LNK LNK #lit14 Link Frame Pointer 1 1 None
LSR LSR f f = Logical Right Shift f 1 1 C, N, OV, Z
LSR f,WREG WREG = Logical Right Shift f 1 1 C, N, OV, Z
LSR Ws,Wd Wd = Logical Right Shift Ws 1 1 C, N, OV, Z
LSR Wb,Wns,Wnd Wnd = Logical Right Shift Wb by Wns 1 1 N, Z
LSR Wb,#lit5,Wnd Wnd = Logical Right Shift Wb by lit5 1 1 N, Z
MOV MOV f,Wn Move f to Wn 1 1 None
MOV [Wns+Slit10],Wnd Move [Wns+Slit10] to Wnd 1 1 None
MOV f Move f to f 1 1 N, Z
MOV f,WREG Move f to WREG 1 1 N, Z
MOV #lit16,Wn Move 16-bit Literal to Wn 1 1 None
MOV.b #lit8,Wn Move 8-bit Literal to Wn 1 1 None
MOV Wn,f Move Wn to f 1 1 None
MOV Wns,[Wns+Slit10] Move Wns to [Wns+Slit10] 1 1
MOV Wso,Wdo Move Ws to Wd 1 1 None
MOV WREG,f Move WREG to f 1 1 N, Z
MOV.D Wns,Wd Move Double from W(ns):W(ns+1) to Wd 1 2 None
MOV.D Ws,Wnd Move Double from Ws to W(nd+1):W(nd) 1 2 None
MUL MUL.SS Wb,Ws,Wnd {Wnd+1, Wnd} = Signed(Wb) * Signed(Ws) 1 1 None
MUL.SU Wb,Ws,Wnd {Wnd+1, Wnd} = Signed(Wb) * Unsigned(Ws) 1 1 None
MUL.US Wb,Ws,Wnd {Wnd+1, Wnd} = Unsigned(Wb) * Signed(Ws) 1 1 None
MUL.UU Wb,Ws,Wnd {Wnd+1, Wnd} = Unsigned(Wb) * Unsigned(Ws) 1 1 None
MUL.SU Wb,#lit5,Wnd {Wnd+1, Wnd} = Signed(Wb) * Unsigned(lit5) 1 1 None
MUL.UU Wb,#lit5,Wnd {Wnd+1, Wnd} = Unsigned(Wb) * Unsigned(lit5) 1 1 None
MUL f W3:W2 = f * WREG 1 1 None
NEG NEG f f = f + 1 1 1 C, DC, N, OV, Z
NEG f,WREG WREG = f + 1 1 1 C, DC, N, OV, Z
NEG Ws,Wd Wd = Ws + 1 1 1 C, DC, N, OV, Z
NOP NOP No Operation 1 1 None
NOPR No Operation 1 1 None
POP POP f Pop f from Top-of-Stack (TOS) 1 1 None
POP Wdo Pop from Top-of-Stack (TOS) to Wdo 1 1 None
POP.D Wnd Pop from Top-of-Stack (TOS) to W(nd):W(nd+1) 1 2 None
POP.S Pop Shadow Registers 1 1 All
PUSH PUSH f Push f to Top-of-Stack (TOS) 1 1 None
PUSH Wso Push Wso to Top-of-Stack (TOS) 1 1 None
PUSH.D Wns Push W(ns):W(ns+1) to Top-of-Stack (TOS) 1 2 None
PUSH.S Push Shadow Registers 1 1 None
TABLE 28-2: INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic Assembly Syntax Description # of
Words
# of
Cycles
Status Flags
Affected
PIC24FJ256GB210 FAMILY
DS39975A-page 344 2010 Microchip Technology Inc.
PWRSAV PWRSAV #lit1 Go into Sleep or Idle mode 1 1 WDTO, Sleep
RCALL RCALL Expr Relative Call 1 2 None
RCALL Wn Computed Call 1 2 None
REPEAT REPEAT #lit14 Repeat Next Instruction lit14 + 1 times 1 1 None
REPEAT Wn Repeat Next Instruction (Wn) + 1 times 1 1 None
RESET RESET Software Device Reset 1 1 None
RETFIE RETFIE Return from Interrupt 1 3 (2) None
RETLW RETLW #lit10,Wn Return with Literal in Wn 1 3 (2) None
RETURN RETURN Return from Subroutine 1 3 (2) None
RLC RLC f f = Rotate Left through Carry f 1 1 C, N, Z
RLC f,WREG WREG = Rotate Left through Carry f 1 1 C, N, Z
RLC Ws,Wd Wd = Rotate Left through Carry Ws 1 1 C, N, Z
RLNC RLNC f f = Rotate Left (No Carry) f 1 1 N, Z
RLNC f,WREG WREG = Rotate Left (No Carry) f 1 1 N, Z
RLNC Ws,Wd Wd = Rotate Left (No Carry) Ws 1 1 N, Z
RRC RRC f f = Rotate Right through Carry f 1 1 C, N, Z
RRC f,WREG WREG = Rotate Right through Carry f 1 1 C, N, Z
RRC Ws,Wd Wd = Rotate Right through Carry Ws 1 1 C, N, Z
RRNC RRNC f f = Rotate Right (No Carry) f 1 1 N, Z
RRNC f,WREG WREG = Rotate Right (No Carry) f 1 1 N, Z
RRNC Ws,Wd Wd = Rotate Right (No Carry) Ws 1 1 N, Z
SE SE Ws,Wnd Wnd = Sign-Extended Ws 1 1 C, N, Z
SETM SETM f f = FFFFh 1 1 None
SETM WREG WREG = FFFFh 1 1 None
SETM Ws Ws = FFFFh 1 1 None
SL SL f f = Left Shift f 1 1 C, N, OV, Z
SL f,WREG WREG = Left Shift f 1 1 C, N, OV, Z
SL Ws,Wd Wd = Left Shift Ws 1 1 C, N, OV, Z
SL Wb,Wns,Wnd Wnd = Left Shift Wb by Wns 1 1 N, Z
SL Wb,#lit5,Wnd Wnd = Left Shift Wb by lit5 1 1 N, Z
SUB SUB f f = f – WREG 1 1 C, DC, N, OV, Z
SUB f,WREG WREG = f – WREG 1 1 C, DC, N, OV, Z
SUB #lit10,Wn Wn = Wn – lit10 1 1 C, DC, N, OV, Z
SUB Wb,Ws,Wd Wd = Wb – Ws 1 1 C, DC, N, OV, Z
SUB Wb,#lit5,Wd Wd = Wb – lit5 1 1 C, DC, N, OV, Z
SUBB SUBB f f = f – WREG – (C) 1 1 C, DC, N, OV, Z
SUBB f,WREG WREG = f – WREG – (C) 1 1 C, DC, N, OV, Z
SUBB #lit10,Wn Wn = Wn – lit10 – (C) 1 1 C, DC, N, OV, Z
SUBB Wb,Ws,Wd Wd = Wb – Ws – (C) 1 1 C, DC, N, OV, Z
SUBB Wb,#lit5,Wd Wd = Wb – lit5 – (C) 1 1 C, DC, N, OV, Z
SUBR SUBR f f = WREG – f 1 1 C, DC, N, OV, Z
SUBR f,WREG WREG = WREG – f 1 1 C, DC, N, OV, Z
SUBR Wb,Ws,Wd Wd = Ws – Wb 1 1 C, DC, N, OV, Z
SUBR Wb,#lit5,Wd Wd = lit5 – Wb 1 1 C, DC, N, OV, Z
SUBBR SUBBR f f = WREG – f – (C) 1 1 C, DC, N, OV, Z
SUBBR f,WREG WREG = WREG – f – (C) 1 1 C, DC, N, OV, Z
SUBBR Wb,Ws,Wd Wd = Ws – Wb – (C) 1 1 C, DC, N, OV, Z
SUBBR Wb,#lit5,Wd Wd = lit5 – Wb – (C) 1 1 C, DC, N, OV, Z
SWAP SWAP.b Wn Wn = Nibble Swap Wn 1 1 None
SWAP Wn Wn = Byte Swap Wn 1 1 None
TBLRDH TBLRDH Ws,Wd Read Prog<23:16> to Wd<7:0> 1 2 None
TABLE 28-2: INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic Assembly Syntax Description # of
Words
# of
Cycles
Status Flags
Affected
2010 Microchip Technology Inc. DS39975A-page 345
PIC24FJ256GB210 FAMILY
TBLRDL TBLRDL Ws,Wd Read Prog<15:0> to Wd 1 2 None
TBLWTH TBLWTH Ws,Wd Write Ws<7:0> to Prog<23:16> 1 2 None
TBLWTL TBLWTL Ws,Wd Write Ws to Prog<15:0> 1 2 None
ULNK ULNK Unlink Frame Pointer 1 1 None
XOR XOR f f = f .XOR. WREG 1 1 N, Z
XOR f,WREG WREG = f .XOR. WREG 1 1 N, Z
XOR #lit10,Wn Wd = lit10 .XOR. Wd 1 1 N, Z
XOR Wb,Ws,Wd Wd = Wb .XOR. Ws 1 1 N, Z
XOR Wb,#lit5,Wd Wd = Wb .XOR. lit5 1 1 N, Z
ZE ZE Ws,Wnd Wnd = Zero-Extend Ws 1 1 C, Z, N
TABLE 28-2: INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic Assembly Syntax Description # of
Words
# of
Cycles
Status Flags
Affected
PIC24FJ256GB210 FAMILY
DS39975A-page 346 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 347
PIC24FJ256GB210 FAMILY
29.0 ELECTRICAL CHARACTERISTICS
This section provides an overview of the PIC24FJ256GB210 family electrical characteristics. Additional information will
be provided in future revisions of this document as it becomes available.
Absolute maximum ratings for the PIC24FJ256GB210 family are listed below. Exposure to these maximum rating
conditions for extended periods may affect device reliability. Functional operation of the device at these, or any other
conditions above the parameters indicated in the operation listings of this specification, is not implied.
Absolute Maximum Ratings(†)
Ambient temperature under bias.............................................................................................................-40°C to +100°C
Storage temperature .............................................................................................................................. -65°C to +150°C
Voltage on VDD with respect to VSS ......................................................................................................... -0.3V to +4.0V
Voltage on any combined analog and digital pin and MCLR, with respect to VSS ......................... -0.3V to (VDD + 0.3V)
Voltage on any digital only pin with respect to VSS when VDD < 3.0V............................................ -0.3V to (VDD + 0.3V)
Voltage on any digital only pin with respect to VSS when VDD > 3.0V..................................................... -0.3V to (+5.5V)
Voltage on VBUS pin with respect to VSS, independent of VDD or VUSB ...................................................-0.3V to (+5.5V)
Maximum current out of VSS pin ...........................................................................................................................300 mA
Maximum current into VDD pin (Note 1)................................................................................................................250 mA
Maximum output current sunk by any I/O pin..........................................................................................................25 mA
Maximum output current sourced by any I/O pin ....................................................................................................25 mA
Maximum current sunk by all ports .......................................................................................................................200 mA
Maximum current sourced by all ports (Note 1)....................................................................................................200 mA
Note 1: Maximum allowable current is a function of device maximum power dissipation (see Table 29-1).
†NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above those
indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
PIC24FJ256GB210 FAMILY
DS39975A-page 348 2010 Microchip Technology Inc.
29.1 DC Characteristics
FIGURE 29-1: PIC24FJ256GB210 FAMILY VOLTAGE FREQUENCY GRAPH (INDUSTRIAL)
TABLE 29-1: THERMAL OPERATING CONDITIONS
Rating Symbol Min Typ Max Unit
PIC24FJ256GB210 family:
Operating Junction Temperature Range TJ-40 — +125 °C
Operating Ambient Temperature Range TA-40 — +85 °C
Power Dissipation (with ENVREG = 1):
Internal Chip Power Dissipation: PINT = VDD x (IDD – IOH)PDPINT + PI/OW
I/O Pin Power Dissipation:
PI/O = ({VDD – VOH} x IOH) + (VOL x IOL)
Maximum Allowed Power Dissipation PDMAX (TJMAX – TA)/JA W
Frequency
Voltage (VDD)
VBOR
32 MHz
3.6V 3.6V
PIC24FJXXXDA1
VBOR
2.2V
2.2V
Note: VCAP (nominal On-Chip Regulator output voltage) = 1.8V.
TABLE 29-2: THERMAL PACKAGING CHARACTERISTICS
Characteristic Symbol Typ Max Unit Note
Package Thermal Resistance, 12x12x1 mm TQFP JA 69.4 — °C/W (Note 1)
Package Thermal Resistance, 10x10x1 mm TQFP JA 76.6 — °C/W (Note 1)
Package Thermal Resistance, 9x9x0.9 mm QFN JA 28.0 — °C/W (Note 1)
Package Thermal Resistance, 10x10x1.1 mm BGA JA 40.2 — °C/W (Note 1)
Note 1: Junction to ambient thermal resistance, Theta-JA (JA) numbers are achieved by package simulations.
2010 Microchip Technology Inc. DS39975A-page 349
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TABLE 29-3: DC CHARACTERISTICS: TEMPERATURE AND VOLTAGE SPECIFICATIONS
DC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Symbol Characteristic Min Typ Max Units Conditions
Operating Voltage
DC10 Supply Voltage
VDD VBOR — 3.6 V Regulator enabled
VCAP(2) — 1.8V — V Regulator enabled
DC12 VDR RAM Data Retention
Voltage(1)
1.5 — — V
DC16 VPOR VDD Start Voltage
to Ensure Internal
Power-on Reset Signal
Vss — — V
DC17 SVDD VDD Rise Rate
to Ensure Internal
Power-on Reset Signal
0.05 — — V/ms 0-3.3V in 66 ms
0-2.5V in 50 ms
VBOR Brown-out Reset Voltage
on VDD Transition,
High-to-Low
2.0 2.10 2.2 V Regulator enabled
VLVD LVD Trip Voltage — VBOR + 0.10 — V
Note 1: This is the limit to which the RAM data can be retained, while the on-chip regulator output voltage starts
following the VDD.
2: This is the on-chip regulator output voltage specification.
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DS39975A-page 350 2010 Microchip Technology Inc.
TABLE 29-4: DC CHARACTERISTICS: OPERATING CURRENT (IDD)
DC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C TA +85°C for Industrial
Parameter
No. Typical(1) Max Units Conditions
Operating Current (IDD)(2)
DC20D 0.8 1.3 mA -40°C
3.3V(3) 1 MIPSDC20E 0.8 1.3 mA +25°C
DC20F 0.8 1.3 mA +85°C
DC23D 3.0 4.8 mA -40°C
3.3V(3) 4 MIPSDC23E 3.0 4.8 mA +25°C
DC23F 3.0 4.8 mA +85°C
DC24D 12.0 18 mA -40°C
3.3V(3) 16 MIPSDC24E 12.0 18 mA +25°C
DC24F 12.0 18 mA +85°C
DC31D 55 95 A-40°C
3.3V(3) LPRC (31 kHz)DC31E 55 95 A +25°C
DC31F 135 225 A +85°C
Note 1: Data in “Typical” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
2: The supply current is mainly a function of the operating voltage and frequency. Other factors, such as I/O pin
loading and switching rate, oscillator type, internal code execution pattern and temperature, also have an
impact on the current consumption. The test conditions for all IDD measurements are as follows: OSCI driven
with external square wave from rail to rail. All I/O pins are configured as inputs and pulled to VDD.
MCLR =VDD; WDT and FSCM are disabled. CPU, SRAM, program memory and data memory are
operational. No peripheral modules are operating and all of the Peripheral Module Disable (PMD) bits are set.
3: On-chip voltage regulator enabled (ENVREG tied to VDD). Brown-out Reset (BOR) is enabled.
2010 Microchip Technology Inc. DS39975A-page 351
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TABLE 29-5: DC CHARACTERISTICS: IDLE CURRENT (IIDLE)
DC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C TA +85°C for Industrial
Parameter
No. Typical(1) Max Units Conditions
Idle Current (IIDLE)(2)
DC40D 170 320 A-40°C
3.3V(3) 1 MIPSDC40E 170 320 A+25°C
DC40F 220 380 A+85°C
DC43D 0.6 1.2 mA -40°C
3.3V(3) 4 MIPSDC43E 0.6 1.2 mA +25°C
DC43F 0.7 1.2 mA +85°C
DC47D 2.3 4.8 mA -40°C
3.3V(3) 16 MIPSDC47E 2.3 4.8 mA +25°C
DC47F 2.4 4.8 mA +85°C
DC50D 0.8 1.8 mA -40°C
3.3V(3)
FRC (4 MIPS)
DC50E 0.8 1.8 mA +25°C
DC50F 1.0 1.8 mA +85°C
DC51D 40.0 85 A-40°C
3.3V(3)
LPRC (31 kHz)
DC51E 40.0 85 A+25°C
DC51F 120.0 210 A+85°C
Note 1: Data in “Typical” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance
only and are not tested.
2: Base IIDLE current is measured with the core off; OSCI driven with external square wave from rail to rail.
All I/O pins are configured as inputs and pulled to VDD. MCLR = VDD; WDT and FSCM are disabled. No
peripheral modules are operating and all of the Peripheral Module Disable (PMD) bits are set.
3: On-chip voltage regulator enabled (ENVREG tied to VDD). Brown-out Reset (BOR) is enabled.
PIC24FJ256GB210 FAMILY
DS39975A-page 352 2010 Microchip Technology Inc.
TABLE 29-6: DC CHARACTERISTICS: POWER-DOWN CURRENT (IPD)
DC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C TA +85°C for Industrial
Parameter
No. Typical(1) Max Units Conditions
Power-Down Current (IPD)(2)
DC60D 20.0 45 A-40°C
3.3V(3) Base power-down current(4)
DC60E 20.0 45 A+25°C
DC60H 55.0 105 A+60°C
DC60F 95.0 185 A+85°C
DC61D 1.0 3.5 A-40°C
3.3V(3) 31 kHz LPRC oscillator with
RTCC, WDT or Timer1: ILPRC(4)
DC61E 1.0 3.5 A+25°C
DC61H 1.0 3.5 A+60°C
DC61F 2.5 6.5 A+85°C
DC62D 1.5 6 A-40°C
3.3V(3)
Low drive strength, 32 kHz crystal
with RTCC or Timer1: ISOSC;
SOSCSEL<1:0> = 01(4)
DC62E 1.5 6 A+25°C
DC62H 1.5 6 A+60°C
DC62F 8.0 18 A+85°C
DC63D 4.0 18 A-40°C
3.3V(3)
32 kHz crystal
with RTCC or Timer1: ISOSC;
SOSCSEL<1:0> = 11(4)
DC63E 4.0 18 A+25°C
DC63H 6.5 18 A+60°C
DC63F 12.0 25 A+85°C
Note 1: Data in the Typical column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance
only and are not tested.
2: Base IPD is measured with the device in Sleep mode (all peripherals and clocks are shut down). All I/Os
are configured as inputs and pulled high. WDT, etc., are all switched off, PMSLP bit is clear and the
Peripheral Module Disable (PMD) bits for all unused peripherals are set.
3: On-chip voltage regulator enabled (ENVREG tied to VDD). Brown-out Reset (BOR) is enabled.
4: The current is the additional current consumed when the module is enabled. This current should be
added to the base IPD current.
2010 Microchip Technology Inc. DS39975A-page 353
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TABLE 29-7: DC CHARACTERISTICS: I/O PIN INPUT SPECIFICATIONS
DC CHARACTERISTICS
Standard Operating Conditions: 2.2V to 3.6V (unless otherwise
stated)
Operating temperature -40°C TA +85°C for Industrial
Param
No. Symbol Characteristic Min Typ(1) Max Units Conditions
VIL Input Low Voltage(3)
DI10 I/O Pins with ST Buffer VSS —0.2 VDD V
DI11 I/O Pins with TTL Buffer VSS —0.15 VDD V
DI15 MCLR VSS —0.2 VDD V
DI16 OSCI (XT mode) VSS —0.2 VDD V
DI17 OSCI (HS mode) VSS —0.2 VDD V
DI18 I/O Pins with I2C™ Buffer: VSS —0.3 VDD V
DI19 I/O Pins with SMBus Buffer: VSS — 0.8 V SMBus enabled
VIH Input High Voltage(3)
DI20 I/O Pins with ST Buffer:
with Analog Functions
Digital Only
0.8 VDD
0.8 VDD
—
—
VDD
5.5
V
V
DI21 I/O Pins with TTL Buffer:
with Analog Functions
Digital Only
0.25 VDD + 0.8
0.25 VDD + 0.8
—
—
VDD
5.5
V
V
DI25 MCLR 0.8 VDD —VDD V
DI26 OSCI (XT mode) 0.7 VDD —VDD V
DI27 OSCI (HS mode) 0.7 VDD —VDD V
DI28 I/O Pins with I2C™ Buffer:
with Analog Functions
Digital Only
0.7 VDD
0.7 VDD
—
—
VDD
5.5
V
V
DI29 I/O Pins with SMBus Buffer:
with Analog Functions
Digital Only
2.1
2.1
VDD
5.5
V
V
2.5V VPIN VDD
DI30 ICNPU CNxx Pull-up Current 15 70 150 AVDD = 3.3V, VPIN = VSS
DI30A ICNPD CNxx Pull-down Current 150 350 550 AVDD = 3.3V, VPIN = VDD
IIL Input Leakage Current(2)
DI50 I/O Ports — — +1AVSS VPIN VDD,
pin at high-impedance
DI51 Analog Input Pins — — +1AVSS VPIN VDD,
pin at high-impedance
DI55 MCLR ——+1AVSS VPIN VDD
DI56 OSCI/CLKI — — +1AVSS VPIN VDD,
EC, XT and HS modes
Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
2: Negative current is defined as current sourced by the pin.
3: Refer to Table 1-3 for I/O pins buffer types.
PIC24FJ256GB210 FAMILY
DS39975A-page 354 2010 Microchip Technology Inc.
TABLE 29-8: DC CHARACTERISTICS: I/O PIN OUTPUT SPECIFICATIONS
DC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Symbol Characteristic Min Typ(1) Max Units Conditions
VOL Output Low Voltage
DO10 I/O Ports — — 0.4 V IOL = 6.6mA, VDD = 3.6V
——0.4VI
OL = 5.0 mA, VDD = 2.2V
DO16 OSCO/CLKO — — 0.4 V IOL = 6.6 mA, VDD = 3.6V
——0.4VIOL = 5.0 mA, VDD = 2.2V
VOH Output High Voltage
DO20 I/O Ports 3.0 — — V IOH = -3.0 mA, VDD = 3.6V
2.4 — — V IOH = -6.0 mA, VDD = 3.6V
1.65 — — V IOH = -1.0 mA, VDD = 2.2V
1.4 — — V IOH = -3.0 mA, VDD = 2.2V
DO26 OSCO/CLKO 2.4 — — V IOH = -6.0 mA, VDD = 3.6V
1.4 — — V IOH = -1.0 mA, VDD = 2.2V
Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
TABLE 29-9: DC CHARACTERISTICS: PROGRAM MEMORY
DC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C TA +85°C for Industrial
Param
No. Symbol Characteristic Min Typ(1) Max Units Conditions
Program Flash Memory
D130 EPCell Endurance 10000 — — E/W -40C to +85C
D131 VPR VDD for Read VMIN —3.6 VVMIN = Minimum operating voltage
D132B VDD for Self-Timed Write VMIN —3.6 VVMIN = Minimum operating voltage
D133A TIW Self-Timed Word Write
Cycle Time
—20—s
Self-Timed Row Write
Cycle Time
—1.5—ms
D133B TIE Self-Timed Page Erase
Time
20 — 40 ms
D134 TRETD Characteristic Retention 20 — — Year If no other specifications are violated
D135 IDDP Supply Current during
Programming
—16—mA
Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated.
2010 Microchip Technology Inc. DS39975A-page 355
PIC24FJ256GB210 FAMILY
TABLE 29-10: INTERNAL VOLTAGE REGULATOR SPECIFICATIONS
29.2 AC Characteristics and Timing Parameters
The information contained in this section defines the PIC24FJ256GB210 family AC characteristics and timing parameters.
TABLE 29-11: TEMPERATURE AND VOLTAGE SPECIFICATIONS – AC
FIGURE 29-2: LOAD CONDITIONS FOR DEVICE TIMING SPECIFICATIONS
Operating Conditions: -40°C < TA < +85°C (unless otherwise stated)
Param
No. Symbol Characteristics Min Typ Max Units Comments
VRGOUT Regulator Output Voltage — 1.8 — V
VBG Internal Band Gap Reference — 1.2 — V
CEFC External Filter Capacitor Value 4.7 10 — F Series resistance < 3 Ohm
recommended; < 5 Ohm
required.
TVREG —10—sVREGS = 1, VREGS = 0 with
WUTSEL<1:0> = 01 or any POR
or BOR
— 190 — s Sleep wake-up with VREGS = 0
and WUTSEL<1:0> = 11
TBG Band Gap Reference Start-up
Time
—1—ms
AC CHARACTERISTICS
Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C TA +85°C for Industrial
Operating voltage VDD range as described in Section 29.1 “DC Characteristics”.
VDD/2
CL
RL
Pin
Pin
VSS
VSS
CL
RL= 464
CL= 50 pF for all pins except OSCO
15 pF for OSCO output
Load Condition 1 – for all pins except OSCO Load Condition 2 – for OSCO
PIC24FJ256GB210 FAMILY
DS39975A-page 356 2010 Microchip Technology Inc.
TABLE 29-12: CAPACITIVE LOADING REQUIREMENTS ON OUTPUT PINS
FIGURE 29-3: EXTERNAL CLOCK TIMING
Param
No. Symbol Characteristic Min Typ(1) Max Units Conditions
DO50 COSCO OSCO/CLKO Pin — — 15 pF In XT and HS modes when
external clock is used to drive
OSCI
DO56 CIO All I/O Pins and OSCO — — 50 pF EC mode
DO58 CBSCLx, SDAx — — 400 pF In I2C™ mode
Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
OSCI
CLKO
Q4 Q1 Q2 Q3 Q4 Q1
OS20
OS25
OS30 OS30
OS40 OS41
OS31
OS31
Q1 Q2 Q3 Q4 Q2 Q3
2010 Microchip Technology Inc. DS39975A-page 357
PIC24FJ256GB210 FAMILY
TABLE 29-13: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Symbol Characteristic Min Typ(1) Max Units Conditions
OS10 FOSC External CLKI Frequency
(External clocks allowed
only in EC mode)
DC
4
—
—
32
48
MHz
MHz
EC
ECPLL
Oscillator Frequency 3.5
4
10
10
31
—
—
—
—
—
10
8
32
32
33
MHz
MHz
MHz
MHz
kHz
XT
XTPLL
HS
HSPLL
SOSC
OS20 TOSC TOSC = 1/FOSC — — — — See parameter OS10 for
FOSC value
OS25 T
CY Instruction Cycle Time(2) 62.5 — DC ns
OS30 TosL,
TosH
External Clock in (OSCI)
High or Low Time
0.45 x T
OSC ——nsEC
OS31 TosR,
TosF
External Clock in (OSCI)
Rise or Fall Time
— — 20 ns EC
OS40 TckR CLKO Rise Time(3) — 6 10 ns
OS41 TckF CLKO Fall Time(3) — 6 10 ns
Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
2: Instruction cycle period (T
CY) equals two times the input oscillator time base period. All specified values are
based on characterization data for that particular oscillator type under standard operating conditions with
the device executing code. Exceeding these specified limits may result in an unstable oscillator operation
and/or higher than expected current consumption. All devices are tested to operate at “Min.” values with an
external clock applied to the OSCI/CLKI pin. When an external clock input is used, the “Max.” cycle time
limit is “DC” (no clock) for all devices.
3: Measurements are taken in EC mode. The CLKO signal is measured on the OSCO pin. CLKO is low for the
Q1-Q2 period (1/2 T
CY) and high for the Q3-Q4 period (1/2 TCY).
TABLE 29-14: PLL CLOCK TIMING SPECIFICATIONS (VDD = 2.2V TO 3.6V)
AC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Symbol Characteristic(1) Min Typ(2) Max Units Conditions
OS50 FPLLI PLL Input Frequency
Range(2)
4 — 48 MHz ECPLL mode
4—32 MHz HSPLL mode
4—8 MHz XTPLL mode
OS51 FSYS PLL Output Frequency
Range
95.76 — 96.24 MHz
OS52 TLOCK PLL Start-up Time
(Lock Time)
——200s
OS53 DCLK CLKO Stability (Jitter) -0.25 — 0.25 %
Note 1: These parameters are characterized but not tested in manufacturing.
2: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
PIC24FJ256GB210 FAMILY
DS39975A-page 358 2010 Microchip Technology Inc.
TABLE 29-15: INTERNAL RC ACCURACY
AC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Characteristic Min Typ Max Units Conditions
F20 FRC Accuracy @
8MHz
(1,2)
-1 ±0.15 1 % -40°C TA +85°C 2.2V VDD 3.6V
F21 LPRC @ 31 kHz -20 — 20 % -40°C T
A +85°C VCAP (on-chip regulator
output voltage) = 1.8V
Note 1: Frequency calibrated at 25°C and 3.3V. OSCTUN bits can be used to compensate for temperature drift.
2: To achieve this accuracy, physical stress applied to the microcontroller package (ex., by flexing the PCB)
must be kept to a minimum.
TABLE 29-16: RC OSCILLATOR START-UP TIME
AC CHARACTERISTICS Standard Operating Conditions: 2.2V to 3.6V (unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Characteristic Min Typ Max Units Conditions
TFRC —15—s
TLPRC —50—s
TABLE 29-17: RESET AND BROWN-OUT RESET REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.2V to 3.6V
(unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Symbol Characteristic Min Typ Max Units Conditions
SY10 TMCL MCLR Pulse width (Low) 2 — — s
SY12 TPOR Power-on Reset Delay — 2 — s
SY13 TIOZ I/O High-Impedance from MCLR
Low or Watchdog Timer Reset
— — 100 ns
SY25 TBOR Brown-out Reset Pulse Width 1 — — sVDD VBOR
TRST Internal State Reset Time — 50 — s
2010 Microchip Technology Inc. DS39975A-page 359
PIC24FJ256GB210 FAMILY
FIGURE 29-4: CLKO AND I/O TIMING CHARACTERISTICS
Note: Refer to Figure 29-2 for load conditions.
I/O Pin
(Input)
I/O Pin
(Output)
DI35
Old Value New Value
DI40
DO31
DO32
TABLE 29-18: CLKO AND I/O TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.2V to 3.6V
(unless otherwise stated)
Operating temperature -40°C T
A +85°C for Industrial
Param
No. Symbol Characteristic Min Typ(1) Max Units Conditions
DO31 TIOR Port Output Rise Time — 10 25 ns
DO32 TIOF Port Output Fall Time — 10 25 ns
DI35 TINP INTx Pin High or Low
Time (input)
20 — — ns
DI40 TRBP CNx High or Low Time
(input)
2——TCY
Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated.
PIC24FJ256GB210 FAMILY
DS39975A-page 360 2010 Microchip Technology Inc.
TABLE 29-19: ADC MODULE SPECIFICATIONS
AC CHARACTERISTICS
Standard Operating Conditions: 2.2V to 3.6V
(unless otherwise stated)
Operating temperature -40°C T
A +85°C
Param
No. Symbol Characteristic Min. Typ Max. Units Conditions
Device Supply
AD01 AVDD Module VDD Supply Greater of
VDD – 0.3
or 2.2
—Lesser of
VDD + 0.3
or 3.6
V
AD02 AVSS Module VSS Supply VSS – 0.3 — VSS + 0.3 V
Reference Inputs
AD05 VREFH Reference Voltage High AVSS + 1.7 — AVDD V
AD06 VREFL Reference Voltage Low AVSS —AVDD – 1.7 V
AD07 VREF Absolute Reference
Voltage
AVSS – 0.3 — AVDD + 0.3 V
Analog Input
AD10 VINH-VINL Full-Scale Input Span VREFL —VREFH V(Note 2)
AD11 VIN Absolute Input Voltage AVSS – 0.3 — AVDD + 0.3 V
AD12 VINL Absolute VINL Input
Voltage
AVSS – 0.3 AVDD/2 V
AD13 Leakage Current — ±1.0 ±610 nA VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V,
Source Impedance = 2.5 k
AD17 RIN Recommended Impedance
of Analog Voltage Source
— — 2.5K 10-bit
ADC Accuracy
AD20B Nr Resolution — 10 — bits
AD21B INL Integral Nonlinearity — ±1 <±2 LSb VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD22B DNL Differential Nonlinearity — ±0.5 <±1 LSb VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD23B GERR Gain Error — ±1 ±3 LSb VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD24B EOFF Offset Error — ±1 ±2 LSb VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD25B Monotonicity(1) — — — — Guaranteed
Note 1: The ADC conversion result never decreases with an increase in the input voltage and has no missing
codes.
2: Measurements taken with external VREF+ and VREF- used as the ADC voltage reference.
2010 Microchip Technology Inc. DS39975A-page 361
PIC24FJ256GB210 FAMILY
TABLE 29-20: ADC CONVERSION TIMING REQUIREMENTS(1)
AC CHARACTERISTICS
Standard Operating Conditions: 2.2V to 3.6V
(unless otherwise stated)
Operating temperature -40°C TA +85°C
Param
No. Symbol Characteristic Min. Typ Max. Units Conditions
Clock Parameters
AD50 TAD ADC Clock Period 75 — — ns TCY = 75 ns, AD1CON3
in default state
AD51 tRC ADC Internal RC Oscillator
Period
— 250 — ns
Conversion Rate
AD55 tCONV Conversion Time — 12 — TAD
AD56 FCNV Throughput Rate — — 500 ksps AVDD > 2.7V
AD57 tSAMP Sample Time — 1 — TAD
Clock Parameters
AD61 tPSS Sample Start Delay from Setting
Sample bit (SAMP)
2—3TAD
Note 1: Because the sample caps will eventually lose charge, clock rates below 10 kHz can affect linearity
performance, especially at elevated temperatures.
PIC24FJ256GB210 FAMILY
DS39975A-page 362 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 363
PIC24FJ256GB210 FAMILY
30.0 PACKAGING INFORMATION
30.1 Package Marking Information
64-Lead TQFP (10x10x1 mm)
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
YYWWNNN
Example
PIC24FJ256
GB206-I/
1020017
100-Lead TQFP (12x12x1 mm)
XXXXXXXXXXXX
XXXXXXXXXXXX
YYWWNNN
PT
3
e
Example
PIC24FJ256GB
210-I/PT
1020017
3
e
Legend: XX...X Customer-specific information
Y Year code (last digit of calendar year)
YY Year code (last 2 digits of calendar year)
WW Week code (week of January 1 is week ‘01’)
NNN Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
*This package is Pb-free. The Pb-free JEDEC designator ( )
can be found on the outer packaging for this package.
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
3
e
3
e
121-BGA (10x10x1.1 mm)
XXXXXXXXXXXX
XXXXXXXXXXXX
YYWWNNN
Example
PIC24FJ256GB
210-I/BG
1020017
3
e
XXXXXXXXXXX
64-Lead QFN (9x9x0.9 mm)
XXXXXXXXXXX
XXXXXXXXXXX
YYWWNNN
PIC24FJ256
Example
GB206-I/MR
1010017
3
e
PIC24FJ256GB210 FAMILY
DS39975A-page 364 2010 Microchip Technology Inc.
30.2 Package Details
The following sections give the technical details of the packages.
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c
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2010 Microchip Technology Inc. DS39975A-page 365
PIC24FJ256GB210 FAMILY
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PIC24FJ256GB210 FAMILY
DS39975A-page 366 2010 Microchip Technology Inc.
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2010 Microchip Technology Inc. DS39975A-page 367
PIC24FJ256GB210 FAMILY
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
PIC24FJ256GB210 FAMILY
DS39975A-page 368 2010 Microchip Technology Inc.
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2010 Microchip Technology Inc. DS39975A-page 369
PIC24FJ256GB210 FAMILY
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123
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c
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α
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PIC24FJ256GB210 FAMILY
DS39975A-page 370 2010 Microchip Technology Inc.
## !"#$%&
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2010 Microchip Technology Inc. DS39975A-page 371
PIC24FJ256GB210 FAMILY
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
PIC24FJ256GB210 FAMILY
DS39975A-page 372 2010 Microchip Technology Inc.
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2010 Microchip Technology Inc. DS39975A-page 373
PIC24FJ256GB210 FAMILY
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
PIC24FJ256GB210 FAMILY
DS39975A-page 374 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 375
PIC24FJ256GB210 FAMILY
APPENDIX A: REVISION HISTORY
Revision A (May 2010)
Original data sheet for the PIC24FJ256GB210 family of
devices.
PIC24FJ256GB210 FAMILY
DS39975A-page 376 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 377
PIC24FJ256GB210 FAMILY
INDEX
A
A/D Conversion
10-Bit High-Speed A/D Converter............................. 301
A/D Converter ................................................................... 301
Analog Input Model ................................................... 309
Transfer Function...................................................... 309
AC Characteristics
A/D Specifications..................................................... 360
ADC Conversion Timing Requirements .................... 361
Capacitive Loading on Output Pin ............................ 356
CLKO and I/O Timing................................................ 359
External Clock Timing ............................................... 357
Internal RC Accuracy ................................................ 358
Load Conditions and Requirements for
Specifications.................................................... 355
PLL Clock Timing Specifications............................... 357
RC Oscillator Start-up Time ...................................... 358
Reset and Brown-out Reset Requirements .............. 358
Timing Parameters.................................................... 355
Alternate Interrupt Vector Table (AIVT) .............................. 91
Assembler
MPASM Assembler................................................... 336
B
Block Diagram
CRC .......................................................................... 293
Block Diagrams
10-Bit High-Speed A/D Converter............................. 302
16-Bit Asynchronous Timer3 and Timer5 ................. 187
16-Bit Synchronous Timer2 and Timer4 ................... 187
16-Bit Timer1 Module................................................ 183
32-Bit Timer2/3 and Timer4/5 ................................... 186
96 MHz PLL .............................................................. 145
Accessing Program Space Using Table
Operations .......................................................... 74
Addressing for Table Registers................................... 79
BDT Mapping for Endpoint Buffering Modes ............ 239
CALL Stack Frame...................................................... 72
Comparator Voltage Reference ................................ 317
CPU Programmer’s Model .......................................... 39
CRC Shift Engine Detail............................................ 293
CTMU Connections and Internal Configuration
for Capacitance Measurement.......................... 319
CTMU Typical Connections and Internal
Configuration for Pulse Delay Generation ........ 320
CTMU Typical Connections and Internal
Configuration for Time Measurement ............... 320
Data Access From Program Space Address
Generation .......................................................... 73
EDS Address Generation for Read Operations .......... 69
EDS Address Generation for Write Operations .......... 70
Extended Data Space ................................................. 68
I2C Module ................................................................ 218
Individual Comparator Configurations,
CREF = 0.......................................................... 312
Individual Comparator Configurations,
CREF = 1 and CVREFP = 0 ............................. 313
Individual Comparator Configurations,
CREF = 1 and CVREFP = 1 ............................. 313
Input Capture ............................................................ 191
On-Chip Regulator Connections ............................... 330
Output Compare (16-Bit Mode)................................. 196
Output Compare (Double-Buffered,
16-Bit PWM Mode) ........................................... 198
PIC24F CPU Core...................................................... 38
PIC24FJ256GB210 Family (General)......................... 19
PSV Operation (Higher Word) .................................... 76
PSV Operation (Lower Word)..................................... 76
Reset System ............................................................. 85
RTCC........................................................................ 281
Shared I/O Port Structure ......................................... 151
SPI Master, Frame Master Connection .................... 214
SPI Master, Frame Slave Connection ...................... 214
SPI Master/Slave Connection (Enhanced
Buffer Modes) ................................................... 213
SPI Master/Slave Connection (Standard Mode)....... 213
SPI Slave, Frame Master Connection ...................... 214
SPI Slave, Frame Slave Connection ........................ 214
SPIx Module (Enhanced Mode)................................ 207
SPIx Module (Standard Mode) ................................. 206
System Clock............................................................ 137
Triple Comparator Module........................................ 311
UART (Simplified)..................................................... 225
USB OTG Device Mode Power Modes .................... 235
USB OTG Dual Power Example............................... 236
USB OTG External Pull-up for Full-Speed
Device Mode..................................................... 235
USB OTG Interface Example ................................... 237
USB OTG Interrupt Funnel ....................................... 243
USB OTG Module..................................................... 234
USB OTG Self-Power Only ...................................... 235
Watchdog Timer (WDT)............................................ 331
C
C Compilers
MPLAB C18.............................................................. 336
Charge Time Measurement Unit (CTMU)......................... 319
Key Features ............................................................ 319
Charge Time Measurement Unit. See CTMU.
Code Examples
Basic Sequence for Clock Switching in Assembly.... 144
Configuring UART1 I/O Input/Output
Functions (PPS) ............................................... 162
EDS Read Code From Program Memory
in Assembly ........................................................ 77
EDS Read Code in Assembly..................................... 69
EDS Write Code in Assembly..................................... 70
Erasing a Program Memory Block (Assembly) ........... 82
I/O Port Write/Read in ‘C’ ......................................... 157
I/O Port Write/Read in Assembly.............................. 157
Initiating a Programming Sequence ........................... 83
PWRSAV Instruction Syntax .................................... 149
Setting the RTCWREN Bit........................................ 282
Single-Word Flash Programming ............................... 84
Single-Word Flash Programming (‘C’ Language)....... 84
Code Protection ................................................................ 332
Code Segment Protection ........................................ 332
Configuration Options....................................... 333
Configuration Register Protection............................. 333
Comparator Voltage Reference ........................................ 317
Configuring ............................................................... 317
Configuration Bits ............................................................. 323
Core Features..................................................................... 15
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DS39975A-page 378 2010 Microchip Technology Inc.
CPU
Arithmetic Logic Unit (ALU)......................................... 41
Control Registers ........................................................ 40
Core Registers ............................................................ 38
Programmer’s Model................................................... 37
CRC
32-Bit Programmable Cyclic Redundancy Check ..... 293
Polynomials............................................................... 294
Setup Examples for 16 and 32-Bit Polynomials ........ 294
User Interface ........................................................... 294
CTMU
Measuring Capacitance ............................................319
Measuring Time ........................................................320
Pulse Generation and Delay ..................................... 320
Customer Change Notification Service ............................. 382
Customer Notification Service........................................... 382
Customer Support ............................................................. 382
D
Data Memory
Address Space............................................................ 45
Extended Data Space (EDS) ...................................... 68
Memory Map ............................................................... 46
Near Data Space ........................................................ 47
SFR Space.................................................................. 47
Software Stack............................................................72
Space Organization, Alignment .................................. 47
DC Characteristics
I/O Pin Input Specifications....................................... 353
I/O Pin Output Specifications ....................................354
Idle Current ............................................................... 351
Operating Current ..................................................... 350
Program Memory ...................................................... 354
Temperature and Voltage Specifications .................. 349
Thermal Conditions...................................................348
Voltage Regulator Specifications .............................. 355
Development Support ....................................................... 335
Device Features
100/121--Pin ............................................................... 18
64-Pin.......................................................................... 17
Doze Mode........................................................................ 150
E
Electrical Characteristics
Absolute Maximum Ratings ......................................347
V/F Graph ................................................................. 348
Enhanced Parallel Master Port. See EPMP...................... 269
ENVREG Pin..................................................................... 330
EPMP ................................................................................ 269
ALTPMP Setting ....................................................... 269
Key Features.............................................................269
Master Port Pins ....................................................... 270
Equations
16-Bit, 32-Bit CRC Polynomials ................................ 294
A/D Conversion Clock Period ................................... 308
Baud Rate Reload Calculation.................................. 219
Calculating the PWM Period ..................................... 198
Calculation for Maximum PWM Resolution............... 199
Estimating USB Transceiver Current
Consumption..................................................... 238
Relationship Between Device and SPI
Clock Speed...................................................... 215
RTCC Calibration......................................................290
UART Baud Rate with BRGH = 0 ............................. 226
UART Baud Rate with BRGH = 1 ............................. 226
Errata .................................................................................. 14
Extended Data Space (EDS) ............................................ 269
F
Flash Configuration Words ......................................... 44, 323
Flash Program Memory ...................................................... 79
Enhanced ICSP Operation ......................................... 80
JTAG Operation.......................................................... 80
Programming Algorithm .............................................. 82
RTSP Operation ......................................................... 80
Single-Word Programming ......................................... 84
Table Instructions ....................................................... 79
I
I/O Ports
Analog Port Pins Configuration................................. 152
Analog/Digital Function of an I/O Pin........................ 152
Input Change Notification ......................................... 157
Open-Drain Configuration......................................... 152
Parallel (PIO) ............................................................ 151
Peripheral Pin Select ................................................ 158
Pull-ups and Pull-Downs........................................... 157
Selectable Input Sources.......................................... 159
Write/Read Timing.................................................... 152
I2C
Clock Rates .............................................................. 219
Reserved Addresses ................................................ 219
Setting Baud Rate as Bus Master............................. 219
Slave Address Masking ............................................ 219
Idle Mode .......................................................................... 150
Input Capture
32-Bit Mode (Cascaded)........................................... 192
Operations ................................................................ 192
Synchronous and Trigger Modes.............................. 191
Input Capture with Dedicated Timers ............................... 191
Input Voltage Levels for Port or Pin
Tolerated Description Input....................................... 152
Instruction Set
Opcode Symbols ...................................................... 340
Overview................................................................... 341
Summary .................................................................. 339
Instruction-Based Power-Saving Modes................... 149, 150
Interfacing Program and Data Spaces................................ 72
Inter-Integrated Circuit. See I2C. ...................................... 217
Internet Address ............................................................... 382
Interrupt Vector Table (IVT) ................................................ 91
Interrupts
Control and Status Registers...................................... 94
Implemented Vectors.................................................. 93
Reset Sequence ......................................................... 91
Setup and Service Procedures................................. 135
Trap Vector Details ..................................................... 92
Vector Table ............................................................... 92
J
JTAG Interface.................................................................. 333
K
Key Features .................................................................... 323
2010 Microchip Technology Inc. DS39975A-page 379
PIC24FJ256GB210 FAMILY
M
Memory Organization.......................................................... 43
Microchip Internet Web Site.............................................. 382
MPLAB ASM30 Assembler, Linker, Librarian ................... 336
MPLAB Integrated Development Environment
Software.................................................................... 335
MPLAB PM3 Device Programmer .................................... 338
MPLAB REAL ICE In-Circuit Emulator System................. 337
MPLINK Object Linker/MPLIB Object Librarian ................ 336
N
Near Data Space ................................................................ 47
O
Oscillator Configuration
96 MHz PLL .............................................................. 144
Clock Selection ......................................................... 138
Clock Switching......................................................... 143
Sequence.......................................................... 143
CPU Clocking Scheme ............................................. 138
Initial Configuration on POR ..................................... 138
USB Operations ........................................................ 146
Output Compare
32-Bit Mode (Cascaded) ........................................... 195
Synchronous and Trigger Modes.............................. 195
Output Compare with Dedicated Timers........................... 195
P
Packaging ......................................................................... 363
Details ....................................................................... 364
Marking ..................................................................... 363
Peripheral Enable Bits ...................................................... 150
Peripheral Module Disable Bits......................................... 150
Peripheral Pin Select (PPS).............................................. 158
Available Peripherals and Pins ................................. 158
Configuration Control ................................................ 161
Considerations for Use ............................................. 162
Input Mapping ........................................................... 158
Mapping Exceptions.................................................. 161
Output Mapping ........................................................ 160
Peripheral Priority ..................................................... 158
Registers................................................................... 163
Pin Descriptions
100-Pin Devices............................................................ 8
121-Pin (BGA) Devices............................................... 11
64-Pin Devices.............................................................. 6
Pin Diagrams
100-Pin TQFP ............................................................... 7
121-Pin BGA ............................................................... 10
64-Pin TQFP/QFN ........................................................ 5
Pinout Descriptions ............................................................. 20
POR
and On-Chip Voltage Regulator................................ 330
Power-Saving Features .................................................... 149
Clock Frequency and Clock Switching...................... 149
Instruction-Based Modes .......................................... 149
Power-up Requirements ................................................... 330
Product Identification System ........................................... 384
Program Memory
Access Using Table Instructions................................. 74
Address Construction.................................................. 72
Address Space............................................................ 43
Flash Configuration Words ......................................... 44
Memory Maps ............................................................. 43
Organization................................................................ 44
Reading From Program Memory Using EDS.............. 75
Program Verification ......................................................... 332
Pulse-Width Modulation (PWM) Mode.............................. 197
Pulse-Width Modulation. See PWM.
PWM
Duty Cycle and Period.............................................. 198
R
Reader Response............................................................. 383
Reference Clock Output ................................................... 147
Register Maps
A/D Converter............................................................. 59
ANCFG ....................................................................... 62
ANSEL........................................................................ 62
Comparators............................................................... 64
CPU Core ................................................................... 48
CRC............................................................................ 64
CTMU ......................................................................... 60
I2C™........................................................................... 54
ICN ............................................................................. 49
Input Capture.............................................................. 52
Interrupt Controller...................................................... 50
NVM............................................................................ 67
Output Compare ......................................................... 53
Pad Configuration....................................................... 58
Peripheral Pin Select .................................................. 65
PMD............................................................................ 67
PORTA ....................................................................... 56
PORTB ....................................................................... 56
PORTC ....................................................................... 57
PORTD ....................................................................... 57
PORTE ....................................................................... 57
PORTF ....................................................................... 58
PORTG....................................................................... 58
RTCC.......................................................................... 63
SPI.............................................................................. 56
System........................................................................ 67
Timers......................................................................... 51
UART.......................................................................... 55
USB OTG ................................................................... 61
Registers
AD1CHS (A/D Input Select)...................................... 306
AD1CON1 (A/D Control 1)........................................ 303
AD1CON2 (A/D Control 2)........................................ 304
AD1CON3 (A/D Control 3)........................................ 305
AD1CSSH (A/D Input Scan Select, High)................. 308
AD1CSSL (A/D Input Scan Select, Low) .................. 307
ALCFGRPT (Alarm Configuration) ........................... 285
ALMINSEC (Alarm Minutes and Seconds Value)..... 289
ALMTHDY (Alarm Month and Day Value) ................ 288
ALWDHR (Alarm Weekday and Hours Value) ......... 289
ANCFG (A/D Band Gap Reference
Configuration) ................................................... 307
ANSA (PORTA Analog Function Selection) ............. 153
ANSB (PORTB Analog Function Selection) ............. 154
ANSC (PORTC Analog Function Selection)............. 154
ANSD (PORTD Analog Function Selection)............. 155
ANSE (PORTE Analog Function Selection) ............. 155
ANSF (PORTF Analog Function Selection).............. 156
ANSG (PORTG Analog Function Selection) ............ 156
BDnSTAT Prototype (Buffer Descriptor n Status, CPU
Mode) ............................................................... 242
BDnSTAT Prototype (Buffer Descriptor n
Status, USB Mode)........................................... 241
CLKDIV (Clock Divider) ............................................ 141
CMSTAT (Comparator Status) ................................. 315
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DS39975A-page 380 2010 Microchip Technology Inc.
CMxCON (Comparator x Control,
Comparators 1-3)............................................. 314
CORCON (CPU Core Control).............................. 41, 96
CRCCON1 (CRC Control 1) .....................................296
CRCCON2 (CRC Control 2) .....................................297
CRCDATH (CRC Data High) .................................... 298
CRCDATL (CRC Data Low)...................................... 298
CRCWDATH (CRC Shift High) ................................. 299
CRCWDATL (CRC Shift Low)...................................299
CRCXORH (CRC XOR High) ................................... 298
CRCXORL (CRC XOR Polynomial, Low Byte) ......... 297
CTMUCON (CTMU Control) .....................................321
CTMUICON (CTMU Current Control) ....................... 322
CVRCON (Comparator Voltage
Reference Control)............................................318
CW1 (Flash Configuration Word 1) ........................... 324
CW2 (Flash Configuration Word 2) ........................... 326
CW3 (Flash Configuration Word 3) ........................... 327
CW4 (Flash Configuration Word 4) ........................... 328
DEVID (Device ID) .................................................... 329
DEVREV (Device Revision) ...................................... 329
I2CxCON (I2Cx Control) ........................................... 220
I2CxMSK (I2Cx Slave Mode Address Mask) ............ 224
I2CxSTAT (I2Cx Status) ........................................... 222
ICxCON1 (Input Capture x Control 1) ....................... 193
ICxCON2 (Input Capture x Control 2) ....................... 194
IEC0 (Interrupt Enable Control 0) ............................. 106
IEC1 (Interrupt Enable Control 1) ............................. 107
IEC2 (Interrupt Enable Control 2) ............................. 109
IEC3 (Interrupt Enable Control 3) ............................. 110
IEC4 (Interrupt Enable Control 4) ............................. 111
IEC5 (Interrupt Enable Control 5) ............................. 112
IFS0 (Interrupt Flag Status 0) ..................................... 99
IFS1 (Interrupt Flag Status 1) ................................... 100
IFS2 (Interrupt Flag Status 2) ................................... 101
IFS3 (Interrupt Flag Status 3) ................................... 103
IFS4 (Interrupt Flag Status 4) ................................... 104
IFS5 (Interrupt Flag Status 5) ................................... 105
INTCON1 (Interrupt Control 1).................................... 97
INTCON2 (Interrupt Control 2).................................... 98
INTTREG (Interrupt Controller Test)......................... 134
IPC0 (Interrupt Priority Control 0) ............................. 113
IPC1 (Interrupt Priority Control 1) ............................. 114
IPC10 (Interrupt Priority Control 10) ......................... 123
IPC11 (Interrupt Priority Control 11) ......................... 124
IPC12 (Interrupt Priority Control 12) ......................... 125
IPC13 (Interrupt Priority Control 13) ......................... 126
IPC15 (Interrupt Priority Control 15) ......................... 127
IPC16 (Interrupt Priority Control 16) ......................... 128
IPC18 (Interrupt Priority Control 18) ......................... 129
IPC19 (Interrupt Priority Control 19) ......................... 129
IPC2 (Interrupt Priority Control 2) ............................. 115
IPC20 (Interrupt Priority Control 20) ......................... 130
IPC21 (Interrupt Priority Control 21) ......................... 131
IPC22 (Interrupt Priority Control 22) ......................... 132
IPC23 (Interrupt Priority Control 23) ......................... 133
IPC3 (Interrupt Priority Control 3) ............................. 116
IPC4 (Interrupt Priority Control 4) ............................. 117
IPC5 (Interrupt Priority Control 5) ............................. 118
IPC6 (Interrupt Priority Control 6) ............................. 119
IPC7 (Interrupt Priority Control 7) ............................. 120
IPC8 (Interrupt Priority Control 8) ............................. 121
IPC9 (Interrupt Priority Control 9) ............................. 122
MINSEC (RTCC Minutes and Seconds Value) ......... 287
MTHDY (RTCC Month and Day Value) .................... 286
NVMCON (Flash Memory Control) ............................. 81
OCxCON1 (Output Compare x Control 1) ................ 200
OCxCON2 (Output Compare x Control 2) ................ 202
OSCCON (Oscillator Control)................................... 139
OSCTUN (FRC Oscillator Tune)............................... 142
PADCFG1 (Pad Configuration Control) ............ 279, 284
PMCON1 (EPMP Control 1) ..................................... 271
PMCON2 (EPMP Control 2) ..................................... 272
PMCON3 (EPMP Control 3) ..................................... 273
PMCON4 (EPMP Control 4) ..................................... 274
PMCSxBS (Chip Select x Base Address)................. 276
PMCSxCF (Chip Select x Configuration).................. 275
PMCSxMD (Chip Select x Mode) ............................. 277
PMSTAT (EPMP Status, Slave Mode) ..................... 278
RCFGCAL (RTCC Calibration and
Configuration) ................................................... 283
RCON (Reset Control)................................................ 86
REFOCON (Reference Oscillator Control) ............... 148
RPINRn (PPS Input) ......................................... 163–173
RPORn (PPS Output) ....................................... 174–181
SPIxCON1 (SPIx Control 1)...................................... 210
SPIxCON2 (SPIx Control 2)...................................... 212
SPIxSTAT (SPIx Status and Control) ....................... 208
SR (ALU STATUS) ............................................... 40, 95
T1CON (Timer1 Control) .......................................... 184
TxCON (Timer2 and Timer4 Control) ....................... 188
TyCON (Timer3 and Timer5 Control) ....................... 189
U1ADDR (USB Address) .......................................... 256
U1CNFG1 (USB Configuration 1)............................. 257
U1CNFG2 (USB Configuration 2)............................. 258
U1CON (USB Control, Device Mode)....................... 254
U1CON (USB Control, Host Mode) .......................... 255
U1EIE (USB Error Interrupt Enable)......................... 265
U1EIR (USB Error Interrupt Status).......................... 264
U1EPn (USB Endpoint n Control)............................. 266
U1IE (USB Interrupt Enable) .................................... 263
U1IR (USB Interrupt Status, Device Mode) .............. 261
U1IR (USB Interrupt Status, Host Mode).................. 262
U1OTGCON (USB OTG Control) ............................. 251
U1OTGIE (USB OTG Interrupt Enable,
Host Mode) ....................................................... 260
U1OTGIR (USB OTG Interrupt Status,
Host Mode) ....................................................... 259
U1OTGSTAT (USB OTG Status, Host Mode) .......... 250
U1PWMCON USB (VBUS PWM
Generator Control)............................................ 267
U1PWRC (USB Power Control)................................ 252
U1SOF (USB OTG Start-of-Token Threshold,
Host Mode) ....................................................... 257
U1STAT (USB Status).............................................. 253
U1TOK (USB Token, Host Mode)............................. 256
UxMODE (UARTx Mode).......................................... 228
UxSTA (UARTx Status and Control)......................... 230
WKDYHR (RTCC Weekday and Hours Value)......... 287
YEAR (RTCC Year Value)........................................ 286
Resets
BOR (Brown-out Reset).............................................. 85
Clock Source Selection............................................... 88
CM (Configuration Mismatch Reset)........................... 85
Delay Times................................................................ 89
Device Times.............................................................. 88
IOPUWR (Illegal Opcode Reset) ................................ 85
MCLR (Pin Reset)....................................................... 85
POR (Power-on Reset)............................................... 85
RCON Flags Operation............................................... 87
2010 Microchip Technology Inc. DS39975A-page 381
PIC24FJ256GB210 FAMILY
SFR States.................................................................. 88
SWR (RESET Instruction)........................................... 85
TRAPR (Trap Conflict Reset)...................................... 85
UWR (Uninitialized W Register Reset) ....................... 85
WDT (Watchdog Timer Reset).................................... 85
Revision History ................................................................ 375
RTCC
Alarm Configuration .................................................. 290
Calibration................................................................. 290
Key Features............................................................. 281
Register Mapping...................................................... 282
S
Selective Peripheral Power Control .................................. 150
Serial Peripheral Interface (SPI) ....................................... 205
Serial Peripheral Interface. See SPI.
SFR Space.......................................................................... 47
Sleep Mode....................................................................... 149
Software Simulator (MPLAB SIM)..................................... 337
Software Stack.................................................................... 72
Special Features ................................................................. 16
SPI .................................................................................... 205
T
Timer1............................................................................... 183
Timer2/3 and Timer4/5...................................................... 185
Timing Diagrams
CLKO and I/O Timing................................................ 359
External Clock........................................................... 356
Triple Comparator ............................................................. 311
Triple Comparator Module ................................................ 311
U
UART ................................................................................ 225
Baud Rate Generator (BRG)..................................... 226
IrDA Support ............................................................. 227
Operation of UxCTS and UxRTS Pins...................... 227
Receiving in 8-Bit or 9-Bit Data Mode....................... 227
Transmitting
Break and Sync Sequence ............................... 227
in 8-Bit Data Mode ............................................ 227
Transmitting in 9-Bit Data Mode ............................... 227
Universal Asynchronous Receiver Transmitter. See UART.
Universal Serial Bus
Buffer Descriptors
Assignment in Different Buffering Modes ......... 240
Interrupts
and USB Transactions ...................................... 244
Universal Serial Bus. See USB OTG.
USB On-The-Go (OTG) ...................................................... 16
USB OTG ......................................................................... 233
Buffer Descriptors and BDT...................................... 239
Device Mode Operation............................................ 244
DMA Interface........................................................... 240
Hardware
Calculating
Transceiver Power Requirements ............ 237
Hardware Configuration............................................ 235
Device Mode..................................................... 235
External Interface ............................................. 237
Host and OTG Modes....................................... 236
VBUS Voltage Generation ................................. 237
Host Mode Operation ............................................... 245
Interrupts .................................................................. 243
Operation.................................................................. 247
Registers .................................................................. 249
VBUS Voltage Generation ......................................... 237
V
Voltage Regulator (On-Chip) ............................................ 330
and BOR................................................................... 330
Low-Voltage Detection ............................................. 330
Standby Mode .......................................................... 330
W
Watchdog Timer (WDT).................................................... 331
Control Register........................................................ 331
Windowed Operation ................................................ 331
WWW Address ................................................................. 382
WWW, On-Line Support ..................................................... 14
PIC24FJ256GB210 FAMILY
DS39975A-page 382 2010 Microchip Technology Inc.
NOTES:
2010 Microchip Technology Inc. DS39975A-page 383
PIC24FJ256GB210 FAMILY
THE MICROCHIP WEB SITE
Microchip provides online support via our WWW site at
www.microchip.com. This web site is used as a means
to make files and information easily available to
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To register, access the Microchip web site at
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CUSTOMER SUPPORT
Users of Microchip products can receive assistance
through several channels:
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Customers should contact their distributor,
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customers. A listing of sales offices and locations is
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Technical support is available through the web site
at: http://support.microchip.com
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DS39975A-page 384 2010 Microchip Technology Inc.
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-
uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation
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DS39975APIC24FJ256GB210 Family
1. What are the best features of this document?
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
2010 Microchip Technology Inc. DS39975A-page 385
PIC24FJ256GB210 FAMILY
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
Architecture 24 = 16-bit modified Harvard without DSP
Flash Memory Family FJ = Flash program memory
Product Group GB2 = General purpose microcontrollers with
USB On-The-Go
Pin Count 06 = 64-pin
10 = 100-pin (TQFP)/121-pin (BGA)
Temperature Range I = -40C to +85C (Industrial)
Package PT = 100-lead (12x12x1 mm) TQFP (Thin Quad Flatpack)
PT = 64-lead, TQFP (Thin Quad Flatpack)
MR = 64-lead (9x9x0.9 mm) QFN (Quad Flatpack, No Lead)
BG = 121-pin BGA package
Pattern Three-digit QTP, SQTP, Code or Special Requirements
(blank otherwise)
ES = Engineering Sample
Examples:
a) PIC24FJ128GB206-I/PT:
PIC24F device with USB On-The-Go, 128-KB
program memory, 96-KB data memory, 64-pin,
Industrial temp., TQFP package.
b) PIC24FJ256GB210-I/PT:
PIC24F device with USB On-The-Go, 256-KB
program memory, 96-KB data memory, 100-pin,
Industrial temp., TQFP package.
Microchip Trademark
Architecture
Flash Memory Family
Program Memory Size (KB)
Product Group
Pin Count
Temperature Range
Package
Pattern
PIC 24 FJ 256 GB2 10 T - I / PT - XXX
Tape and Reel Flag (if applicable)
DS39975A-page 386 2010 Microchip Technology Inc.
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Fax: 886-3-6578-370
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
EUROPE
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
WORLDWIDE SALES AND SERVICE
01/05/10
