Preliminary W541E20X Data Sheet
4-BIT FLASH EPROM MICROCONTROLLER
Publication Release Date: April 14, 2005
- 1 - Revision A2
Table of Contents-
1. GENERAL DESCRIPTION......................................................................................................... 2
2. FEATURES................................................................................................................................. 2
3. BLOCK DIAGRAM...................................................................................................................... 4
4. PIN CONFIGURATIONS ............................................................................................................ 5
5. PIN DESCRIPTION..................................................................................................................... 6
6. ELECTRICAL CHARACTERISTICS........................................................................................... 7
6.1 Absolute Maximum Ratings .......................................................................................... 7
6.2 DC Characteristics ........................................................................................................ 7
6.3 AC Characteristics......................................................................................................... 8
7. APPLICATION CIRCUIT............................................................................................................. 9
8. PACKAGE DIAMENSIONS....................................................................................................... 10
8.1 18-Lead PDIP (300 mil)............................................................................................... 10
8.2 20-Lead PDIP.............................................................................................................. 11
8.3 28-Lead PDIP Skinny.................................................................................................. 12
8.4 20-Lead SOP (300mil)................................................................................................. 13
8.5 28-Lead SOP (300 mil)................................................................................................ 14
9. REVISION HISTORY................................................................................................................ 15
Preliminary W541E20X
- 2 -
1. GENERAL DESCRIPTION
The W541E20X is fully compatible with W741E20X in terms of pin assignment and IC function. It is a
high-performance 4-bit microcontroller (μC) that provides an flash EEPROM for the program memory.
The device contains a 4-bit ALU, two 8-bit timers, a divider, a serial port, and five 4-bit I/O ports
(including 3 output port for LED driving). There are also seven interrupt sources and 8-level subroutine
nesting for interrupt applications. The W541E20X has two power reduction modes, hold mode and
stop mode, which help to minimize power dissipation.
The W541E20X is suitable for end product manufacturer engineering testing and earlier samples
before mass production.
2. FEATURES
• Operating voltage: 2.4V−5.5V
• Crystal or RC oscillation circuit can be selected by the code option
− Crystal/Ceramic oscillator: up to 4 MHz
− RC oscillator: up to 4 MHz
• Both in crystal or RC oscillator operation mode, high-frequency (400 KHz to 4 MHz) or lown
frequency (32.768 KHz) oscillation must be determined by the code option
• Memory
− 2048 × 16 bit program flash EEPROM (including 2K × 4 bit look-up table)
− 128 × 4 bit data RAM (including 16 working registers)
• 21 input/output pins
− Input/output ports: 4 ports/16 pins
− Serial input/output port: 1 port /4 pins (high sink current for LED driving)
− MFP output pin: 1 pin (MFP)
− Do not be floating when it is as input or output open-drain (NMOS type).
• Power-down mode
− Hold function: no operation (except for oscillator)
− Stop function: no operation (including oscillator)
• Seven types of interrupts
− Five internal interrupts (Divider 0, Timer 0, Timer 1, and Serial I/O)
− Two external interrupts (Port RC and INT pin)
Preliminary W541E20X
Publication Release Date: April 14, 2005
- 3 - Revision A2
• MFP output pin
− Output is software selectable as modulating or nonmodulating frequency
− Works as frequency output specified by Timer 1
• Built-in 14-bit clock frequency divider circuit
• Two built-in 8-bit programmable countdown timers
− Timer 0: One of two internal clock frequencies (FOSC/4 or FOSC/1024) can be selected
− Timer 1: Offers auto-reload function and one of two internal clock frequencies (FOSC or FOSC/64)
can be selected or falling edge of pin RC.0 can be selected (output through MFP pin)
• Built-in 18/14-bit watchdog timer selectable for system reset
• Powerful instruction set: 118 instructions
• 8-level subroutine (include interrupt) nesting
• One serial transmission/receiver port specified by software
• Up to 1 μS instruction cycle (with 4 MHz operating frequency)
• Packaged in 18-pin, 20-pin, 28-pin PDIP and 20-pin, 28-pin SOP
Preliminary W541E20X
- 4 -
3. BLOCK DIAGRAM
XIN XOUT
PC
STACK
(8 Levels)
RAM
(128*4)
ALU
Timer 0
(8-bit)
Timing Generator
PORT RA
PORT RB
Modulation
Frequency
Pulse
RA0 to 3
RB0 to 3
RE0 to 3
MFP
VDD
VSS
Flash
EEPROM
(2048*16)
(look_up table
2K*4)
Timer 1
(8-bit)
ACC
Divider 0
(14-bit)
Watchdog Timer
(4-bit)
HCF
PEFHEFIEF
Central Control
Unit
EVF SEF
PSR0
..
MUX
SEL
+1(+2)
.
PORT RC RC0 to
3
PORT RD RD0 to 3
PR PM0MR0
PSR1 PSR2
PORT RT
Serial I/O MUX
(RE0/DOUT,
RE1/CLKO,
RE2/DIN,
RE3/CLKI)
SEL
VPP (RES)
MODE (INT)
DATA (RA3)
RES
INT
Preliminary W541E20X
Publication Release Date: April 14, 2005
- 5 - Revision A2
4. PIN CONFIGURATIONS
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
RB3
RB2
RB1
VSS
RA1
RA0
XIN
XOUT
VDD
RC3
RC2
RC1
(Vpp) /RES
(MODE) /INT
(DATA) RA3
RA2
RB0
RC0
RE3
RE2
RE1
VSS
RA1
RA0
XIN
XOU
T
VDD
RD3
RD2
RD1
(Vpp) /RES
(MODE) /INT
(DATA) RA3
RA2
RE0
RD0
RB0 RC3
RB3
RB2
RB1 RC2
RC1
RC0
20
21
22
23
24
25
26
27
28
19
16
17
18
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NC MFP
W541E201
W541E202/W541E205
18-PDIP (300 mil) 28 SKINNY (300 mil), 28 SOP
10 11
12
13
15
16
17
18
1
2
3
4
5
6
7
8
9
RB3
RB2
RB1
VSS
RA1
RA0
XIN
XOUT
VDD
RC3
RC2
RC1
(Vpp) /RES
(MODE) /INT
(DATA) RA3
RA2
RB0
RC0
W541E203
20-PDIP (300 mil)
14
VSS VDD
19
20
10 11
12
13
15
16
17
18
1
2
3
4
5
6
7
8
9
RB3
RB2
RB1
VSS
RA1
RA0
XIN
XOU
T
VDD
RC3
RC2
RC1
(Vpp) /RES
(MODE) /INT
(DATA) RA3
RA2
RB0
RC0
W541E204
20 SOP
14
VSS VDD
19
20
Preliminary W541E20X
- 6 -
5. PIN DESCRIPTION
SYMBOL I/O FUNCTION
XIN I
Input pin for oscillator.
Connected to crystal or resistor to generate system clock by code option.
External 10~20pF capacitor uses to get accurate freq in crystal mode.
XOUT O
Output pin for oscillator.
Connected to crystal or resistor to generate system clock by code option.
20pF capacitor is built in internal for crystal mode.
RA0−RA2,
RA3 (DATA) I/O Input/Output port.
Input/output mode specified by port mode 1 register (PM1). When used as
output port, can provide high sink current for driving LED.
RB0−RB3 I/O Input/Output port.
Input/output mode specified by port mode 2 register (PM2). When used as
output port, can provide high sink current for driving LED.
RC0−RC3 I/O Input/Output port.
Input/output mode specified by port mode 4 register (PM4). Each pin has
an independent interrupt capability in input mode.
RD0−RD3 I/O Input/Output port.
Input/output mode specified by port mode 5 register (PM5).
RE0/DOUT,
RE1/CLKO,
RE2/DIN,
RE3/CLKI
I/O
Special input/output port.
This port can be configured by software to act as the output of internal
port RT or the serial I/O port. When used as output port, can provide high
sink current for driving LED.
MFP O
Output pin only.
This pin can output modulating or nonmodulating frequency, or Timer 1
clock output specified by mode register 1 (MR1).
INT (MODE)1I External interrupt pin.
This pin must be tied to VDD through an external resistor. It is a low active
and floating input pin.
RES (VPP)1I System reset pin.
This pin must be tied to VDD through an external resistor when it is not
used to reset this chip. It is a low active and floating input pin.
VDD I Positive power supply (+).
VSS I Negative power supply (-).
Note: There are internal pull-high resistors in these pins of W741C20X.
Preliminary W541E20X
Publication Release Date: April 14, 2005
- 7 - Revision A2
6. ELECTRICAL CHARACTERISTICS
6.1 Absolute Maximum Ratings
PARAMETER RATING UNIT
Supply Voltage to Ground Potential -0.3 to +7.0 V
Applied Input/Output Voltage -0.3 to +7.0 V
Power Dissipation 120 mW
Ambient Operating Temperature 0 to +70 °C
Storage Temperature -55 to +150 °C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
6.2 DC Characteristics
(VDD-VSS = 3.0 V, Fosc. = 32.768 KHz, Ta = 25° C; unless otherwise specified)
PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT
Op. Voltage VDD - 2.4 - 5.5 V
Op. Current (Crystal type) IOP1 No load (Ext-V) - 8.5 20 μA
Op. Current (RC type) IOP2 No load (Ext-V) - 36 65 μA
Hold Current (Crystal type) IHM1 Hold mode No
load (Ext-V) - 4 6
μA
Hold Current (RC type) IHM2 Hold mode No
load (Ext-V) - 16 40
μA
Stop Current (Crystal type) ISM1 Stop mode No
load (Ext-V) - 0.1 2 μA
STOP CURRENT (RC TYPE) ISM2 Stop mode
No load (Ext-V) - 0.1 2 μA
Input Low Voltage VIL - VSS - 0.3 VDD V
Input High Voltage VIH - 0.7 VDD - VDD V
MFP Output Low Voltage VML IOL = 3.5mA - - 0.4 V
MFP Output High Voltage VMH IOH = -3.5mA 2.4 - - V
Port RA, RB Sink Current IABL VOL = 0.9V 9 - - mA
Port RA, RB Source Current IABH VOH = 2.4V 0.4 1.2 - mA
Port RC, RD Output Low Voltage VCDL IOL = 2.0 mA - - 0.4 V
Port RC, RD Output High Voltage VCDH IOH = -2.0 mA 2.4 - - V
Preliminary W541E20X
- 8 -
DC Characteristics, continued
PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT
Port RE Sink Current IEL VOL = 0.9V 9 - - mA
Port RE Source Current IEH VOH = 2.4V 0.4 1.2 - mA
DIN Pin Pull-up Resistor RDIN RE.2 used as
serial input pin 50 250 1000
KΩ
6.3 AC Characteristics
(VDD-VSS = 3.0 V, Ta = 25° C; unless otherwise specified)
PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT
RC type - - 4000
Op. Frequency Fosc Crystal type 1
(Option low speed
type) - 32.768 - KHz
Crystal type 2
(Option high speed
type) 400 - 3580
Frequency Deviation by
Voltage Drop for RC Oscillator Δf
f f(3V) - f(2.4V)
f(3V) - - 10 %
Instruction Cycle Time TI One machine cycle - 4/Fosc - S
Serial Port Data Ready Time TDR - 200 - - nS
Serial Port Data Hold Time TDH - 200 - - nS
Reset Active Width TRAW Fosc = 32.768 KHz 1 - - μS
Interrupt Active Width TIAW Fosc = 32.768 KHz 1 - - μS
Preliminary W541E20X
Publication Release Date: April 14, 2005
- 9 - Revision A2
7. APPLICATION CIRCUIT
MFP
INT
RES
XOUT
XIN
RC2
RC3
RA0
RA3
Output Signal
RB0
RB1
RB2
RB3
RC0
RC1
RD0
RD1
RD2
RD3
or
RE0
RE1
RE2
RE3
Vcc
Vcc
Vcc
VDD
VSS
Vcc Vcc
Vcc
Preliminary W541E20X
- 10 -
8. PACKAGE DIAMENSIONS
8.1 18-Lead PDIP (300 mil)
1.631.47
0.0640.058
Symbol Min. Nom. Max Max.
Nom.
Min
Dimension in inch Dimension in mm
A
B
c
D
e
A
L
S
A
A1
2
E
0.060 1.52
0.175 4.45
0.010
0.125
0.016
0.130
0.018
0.135
0.022
3.18
0.41
0.25
3.30
0.46
3.43
0.56
0.008
0.120
0.375
0.010
0.130
0.014
0.140
0.20
3.05
0.25
3.30
0.36
3.56
0.255
0.250
0.245 6.486.35
6.22
9.53
7.62
7.37 7.87
0.3000.290 0.310
2.29 2.54 2.790.090 0.100 0.110
B1
1
e
E1
0.900 0.910 22.86 23.11
015
0.055 1.40
0.355
0.335 8.51 9.02
150
Seating Plane
A
e
2
A
c
E
Base Plane
1
A
1
e
L
A
S
1
E
D
1
B
B
18 10
19
α
α
Preliminary W541E20X
Publication Release Date: April 14, 2005
- 11 - Revision A2
Package Dimensions, continued
8.2 20-Lead PDIP
1.631.47
0.0640.058
Symbol Min. Nom. Max. Max.
Nom.
Min.
Dimension in inch Dimension in mm
A
B
c
D
e
A
L
S
A
A1
2
E
0.060 1.52
0.175 4.45
0.010
0.125
0.016
0.130
0.018
0.135
0.022
3.18
0.41
0.25
3.30
0.46
3.43
0.56
0.008
0.120
0.375
0.010
0.130
0.014
0.140
0.20
3.05
0.25
3.30
0.36
3.56
0.255
0.250
0.245 6.486.35
6.22
9.53
7.62
7.37 7.87
0.3000.290 0.310
2.29 2.54 2.790.090 0.100 0.110
B1
1
e
E1
1.026 1.040 20.06 26.42
015
0.075 1.91
0.355
0.335 8.51 9.02
150
Seating Plane
A
e
2
A
c
E
Base Plane
1
A
1
e
L
A
S
1
E
D
1
B
B
20
110
11
α
α
Preliminary W541E20X
- 12 -
Package Dimensions, continued
8.3 28-Lead PDIP Skinny
1.631.47
0.0640.058
Symbol Min. Nom. Max. Max.
Nom.
Min.
Dimension in Inches Dimension in mm
A
B
c
D
e
A
L
S
A
A1
2
E
0.060 1.52
0.175 4.45
0.010
0.125
0.016
0.130
0.018
0.135
0.022
3.18
0.41
0.25
3.30
0.46
3.43
0.56
0.008
0.120
0.370
0.010
0.130
0.014
0.140
0.20
3.05
0.25
3.30
0.36
3.56
0.293
0.288
0.283 7.447.32
7.19
9.40
7.87
7.62 8.13
0.3100.300 0.320
2.29 2.54 2.790.090 0.100 0.110
B1
1
e
E1
a
1.388 1.400 35.26 35.56
0 15
0.055 1.40
0.350
0.330 8.38 8.89
150
eA
a
c
E
1E
D
28 15
1 14
ABase Plane
Mounting Plane
1
A
1
e
L
A
S
1
B
B
2
Preliminary W541E20X
Publication Release Date: April 14, 2005
- 13 - Revision A2
Package Dimensions, continued
8.4 20-Lead SOP (300mil)
L
c
EH
A1
A
e
b
D
SEATING PLANE
Y
0.25
GAUGE PLAN
E
E
1
20 11
10
7.60
0.32
0.51
0.30
E
c
b
A1
7.40
0.23
0.33
0.10
0.299
0.013
0.020
0.012
0.291
0.009
0.013
0.004
Max.
Dimension in mm
2.65
A
Symbol Min.
2.35
Dimension in Inches
0.104
Min.
0.093 Max.
Control demensions are in milmeters.
1.27
0.10
10.65
L
θ
Y
H
08
0.40
10.00
e1.27 BSC
0.050
0.004
0.419
0
0.016
0.394
8
0.050 BSC
E
D12.60 13.00 0.496 0.512
θ
Preliminary W541E20X
- 14 -
Package Dimensions, continued
8.5 28-Lead SOP (300 mil)
L
c
EH
A1
A
e
b
D
SEATING PLANE
Y
0.25
GAUGE PLAN
E
E
1
28 15
14
7.60
0.32
0.51
0.30
E
c
b
A1
7.40
0.23
0.33
0.10
0.299
0.013
0.020
0.012
0.291
0.009
0.013
0.004
Max.
Dimension in mm
2.65
A
Symbol Min.
2.35
Dimension in Inches
0.104
Min.
0.093 Max.
Control demensions are in milmeters .
1.27
0.10
10.65
L
θ
Y
H
08
0.40
10.00
e 1.27 BSC
0.050
0.004
0.419
0
0.016
0.394
8
0.050 BSC
E
D17.70 18.10 0.697 0.713
θ
Preliminary W541E20X
Publication Release Date: April 14, 2005
- 15 - Revision A2
9. REVISION HISTORY
REVISION DATE DESCRIPTION
A1 May 30, 2003 Initial Issued
A2 April 14, 2005 Add Important Notice
Important Notice
Winbond products are not designed, intended, authorized or w arranted for use as components
in systems or equipment intended for surgical implantation, atomic energy control
instruments, airplane or spaceship instruments, transportation instruments, traffic signal
instruments, combustion control instruments, or for other applications intended to support or
sustain life. Further more, Winbond products are not intended for applications w herein failure
of Winbond products could result or lead to a situation wherein personal injury, death or
severe property or environmental damage could occur.
Winbond customers using or selling these products for use in such applications do so at their
ow n risk and agree to fully indemnify Winbond for any damages resulting from such improper
use or sales.