Copyright ©2007 by ZiLOG, Inc. All rights reserved.
www.zilog.com
Product Block Diagram
Key Features
The eZ80F91 MCU is a member of ZiLOG’s
eZ80Acclaim!® product family which offers
on-chip Flash versions of ZiLOG’s eZ80®
processor core. The eZ80F91 MCU offers the
following features:
•50 MHz high-performance eZ80® CPU
•256 KB Flash Program Memory and extra
512 B device configuration Flash Memory
•32 bits of General-Purpose Input/Output
(GPIO)
•16 KB total on-chip high-speed SRAM:
–8 KB for general-purpose use
–8 KB for 10/100 BaseT Ethernet Media
Access Controller (EMAC) high-speed
frame buffer
•IrDA-compatible infrared encoder/decoder
•Two universal asynchronous receiver/
transmitter (UARTs) with independent baud
rate generators
•Inter-integrated circuit (I2C) and serial
peripheral interface (SPI) with independent
clock rate generator
•Four counter/timers with prescalers supporting
event counting, input capture, output compare,
and Pulse Width Modulator (PWM) modes
•Watchdog Timer (WDT) with internal RC
clocking option
•Real time clock (RTC) with on-chip 32 KHz
oscillator, selectable 50/60 Hz input, and
separate RTC_VDD pin for battery backup
•Glueless external memory interface with 4
Chip-Selects/Wait-State Generators and
external WAIT input pin. It also supports
Intel® and Motorola® buses
•JTAG and ZiLOG Debug Interface (ZDI) sup-
porting emulation features
•Low-power PLL and on-chip oscillator
•Programmable-priority vectored interrupts,
non-maskable interrupts, and interrupt
controller
•New DMA-like eZ80® CPU instructions
•Power management features supporting
HALT/SLEEP modes and selective peripheral
power-down controls
•144-pin BGA package or 144-pin LQFP
package
•3.0 V to 3.6 V supply voltage with 5 V
tolerant inputs
eZ80F91 MCU
256 KB Flash +
512 B Flash 32-Bit GPIO
8 KB SRAM
10/100 Mbps
Ethernet MAC
8 KB Frame Buffer
Infrared
Encoder/
Decoder
2 UART I2CSPI
4 PRT WDT Real Time
Clock
4 CS
+ WSG JTAG ZDI PLL
eZ80F91 MCU
Product Brief
PB013505-0607
eZ80Acclaim!® Flash Microcontrollers
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
2
•Operating temperature ranges:
–Standard, 0 ºC to +70 ºC
–Extended, –40 ºC to +105 ºC
General Description
The eZ80F91 MCU is industry’s first MCU
featuring a high-performance 8-bit microcontroller
with an integrated 10/100 BaseT EMAC. It is a
power-efficient, optimized pipeline architecture
microcontroller with a maximum operating speed
of 50 MHz. Offering on-chip Flash Memory,
SRAM, Ethernet MAC, and rich peripherals, the
eZ80F91 is well-suited for industrial, communica-
tion, automation, security, and embedded Internet
applications.
eZ80® CPU Core
The eZ80® CPU operates either in Z80-compatible
(64 KB) mode or full 24-bit (16 MB) addressing
mode. Considering both the increased clock speed
and processor efficiency, the processing power of
eZ80® competes with the performance of 16-bit
microprocessors. The eZ80® improves on the
world-famous Z80® architecture. Like Z80® ,
eZ80® CPU features dual bank registers for fast
context switching.
eZ80F91 MCU Peripherals
Description
The peripherals of eZ80F91 MCU includes the
following:
On-Chip Memory
The eZ80F91 device offers 256 KB of Flash
Program Memory. A separate page of 512- bytes
Flash Memory is available for general device
configuration data. Other on-chip memory features
include:
•Single power supply operation
•Page erase feature, 2048 bytes/page
•Fast page erase and byte program operation
•78 ns minimum read cycle
•Endurance, 10,000 write cycles (typical)
•The data can be retained for more than
100 years at room temperature
In addition, 16 KB of high-speed, relocatable
SRAM is available and 8 KB is for general-
purpose use. Another 8 KB is used by the EMAC
for Ethernet operation, but is also user-accessible
when Ethernet functionality is not required.
General-Purpose Input/Output
There are 32 bits of GPIO. All GPIO pins are
individually programmable and support the
following I/O modes: input, output, open drain,
open source, level-triggered interrupts (High or
Low), edge-triggered interrupts (High or Low),
dual edge-triggered interrupts, and alternate
function. Eight of the output pins can drive 10 mA
each (Port A), while 16 other pins feature
Schmitt-trigger input buffers (Port B and Port C).
10/100 BaseT Ethernet MAC
The eZ80F91 MCU features an integrated IEEE
802.3 Ethernet controller with 8 KB of
dynamically-configurable Tx/Rx frame buffer. It
supports speed of 10 Mbps and 100 Mbps, full
duplex operation, and an industry-standard Media
Independent Interface (MII) for simple connection
to an external Physical Layer interface (PHY)
device. The eZ80F91 delivers high performance
and overall cost effectiveness as an embedded
network microcontroller.
High performance is achieved by optimizing the
internal bus design of the eZ80® CPU with shared
memories, dedicated Ethernet Tx/Rx DMAs, and
Tx/Rx FIFOs. This bus design provides the highest
data throughput over the Ethernet interface, yet
requires minimum eZ80® CPU intervention and
minimizes system loading.
Infrared Encoder/Decoder
•Supports IrDA SIR format
•Operates seamlessly with on-chip UART
•Interfaces with IrDA-compliant transceivers
•Supports transmit/receive to 115 Kbps
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
3
Universal Asynchronous Receiver/Transmitter
Each of the two UART channels contains a
transmitter, a receiver, control logic/registers, and a
Baud Rate Generator (BRG).
•The BRG produces a lower-frequency bit clock
from the system clock. All standard baud rates
up to 115 Kbps (and higher) are supported.
•The UART module implements the logic
required to support asynchronous communica-
tions, hardware flow control, and 9-bit charac-
ter format. The module also contains separate
16-byte-deep transmit and receive FIFOs.
Inter-Integrated Circuit
The I2C channel contains control registers and a
clock rate generator. The I2C interface operates in
four modes: Master Transmit or Receive and Slave
Transmit or Receive. A standard and fast I2C speed
of 100 kbps and 400 kbps are supported.
Serial Peripheral Interface
The SPI channel contains control registers and a
clock rate generator. The SPI is a synchronous
serial interface allowing multiple SPI devices to be
interconnected. The SPI interface is configured to
function either as a master or a slave.
Programmable Reload Timers
The eZ80F91 MCU provides four independent
Programmable Reloadable Counter Timers (PRT)
to handle complex timing functions. Each timer is
a 16-bit downcounter and offers a 4-bit clock
prescaler with four selectable taps for CLK ÷ 4,
CLK ÷ 16, CLK ÷ 64 and CLK ÷ 256. The timers
operates in basic mode supporting SINGLE-PASS
or CONTINUOUS count. Additional features
include 4 input captures, 4 output compares,
2 external event counters, and 4 PWMs that can
operate independently or in unison. Any one of the
input capture pins can be programmed as master
PWM power-trip inputs.
Watchdog Timer
The WDT features four programmable time-out
periods. It operates either from the main system
clock, the on-chip 32 KHz oscillator (from the
RTC), or the internal RC oscillator. The time-out
action of the WDT is user-programmable for either
a hardware reset or a non-maskable interrupt to the
eZ80® CPU. The source of action taken after a
WDT time-out is indicated by a WDT status bit.
Real Time Clock
The RTC allows counting of seconds, minutes,
hours, day-of-the-week, day-of-the-month, month,
year, and century. Alarms and interrupts can be set
for seconds, minutes, hours, and day-of-the-week.
The RTC input is taken either from the on-chip
32 KHz oscillator or from a 50/60 Hz input. The
RTC operates from an isolated RTC_VDD pin to
allow constant operation from a battery.
Chip-Select/Wait State Generator and WAIT Pin
Four independent chip selects facilitate glueless
interface to system memory and external devices.
Each chip-select can be configured for up to 7 wait
states and supports either memory or I/O space.
Memory chip selects can be individually
programmed on a 64 KB boundary. I/O chip
selects can choose a 256 byte section of I/O space.
The WAIT input pin allows interface with slow
peripherals. It also supports Z80® , Intel®, and
Motorola® bus modes.
JTAG Interface
An IEEE 1149.1-compatible five-pin test access
port (TAP) is provided to interface with on-chip
test logic defined by IEEE standard. The TAP also
includes Boundary Scan functions and is used to
control on-chip emulation/debugging capabilities.
Some features include software break points,
64-word trace buffer, complex break points using
address and data masks, and cascadable triggers.
PLL and On-Chip Crystal Oscillator
The eZ80F91 MCU features a low-power,
programmable PLL that can be selected to generate
the system clock. Taking the input from the
on-chip crystal oscillator, the PLL generates
system clock speed up to 50 MHz from low-cost,
low-frequency external crystals in the range of
1 MHz to 10 MHz.
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
4
ZiLOG Debug Interface
The ZiLOG Debug Interface (ZDI) incorporates
the functions of an in-circuit emulator. ZDI allows
you to single-step code, change registers, edit
programs, and view status of the internal registers.
Block Transfer Instructions
Block transfer instructions with expanded repeat
capability are added to the eZ80® CPU. They
provide high-performance data transfer similar to
hardware DMAs.
Power Management
The eZ80F91 MCU supports several power
management features. Two peripheral
Power-Down Registers allow independent clock
gating of on-chip peripherals under software
control while operating under normal conditions.
The eZ80® CPU writes to the control registers to
disable the clock from driving any one of the
peripherals while they are inactive.
In addition, execution of the HALT instruction
suspends eZ80® CPU operation and eliminates
clock power associated with the eZ80® CPU core.
Normal operation is restored via external and
peripheral interrupts or hardware reset.
Execution of a sleep (SLP) instruction provides the
lowest power consumption. In SLEEP mode, only
the on-chip RTC 32 KHz crystal oscillator remains
active to drive the RTC and the WDT. Other
peripherals like the system clock, and the primary
oscillator are disabled. You can reset the device by
RTC alarm, a WDT time-out, or hardware reset.
Electrical Features Summary
•Power supply, 3.3 V ± 0.3 V
•Standard temperature, 0 ºC to 70 ºC
•Extended temperature, –40 ºC to +105 ºC
•Supply current at 50 MHz; 50 mA (typical)
•Supply current in HALT mode with peripherals
powered down; <5 mA (typical)
•Supply current in SLEEP mode; <50 µA
(typical)
Support Tools
The following development tools are available to
program and debug the eZ80F91 MCU:
Hardware
•eZ80® Development Platform with plug-in
eZ80F91 Module
Software
•ZiLOG TCP/IP (ZTP) software suite
•ANSI C-Compiler
•ZiLOG Developer’s Studio Integrated
Development Environment (ZDS II IDE)
including assembler, linker, debugger, and sim-
ulator
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
5
Related Products
Other integrated devices of interest are:
eZ80190 50 MHz eZ80® CPU, 8 KB SRAM, 16x16 multiply with 40-bit accumulators, 32 bits GPIO,
6 Counter Timers with prescalers, WDT, 4 channel CS + WSG, 2 Channel DMA, 2 UZI
Channels, ZDI, On-Chip Oscillator.
eZ80L92 20 MHz and 50 MHz eZ80® CPU, low-power modes, 24 bits GPIO, IrDA, 2 UART, I2C, SPI,
6 Counter Timers with I/O features, WDT, RTC, 4 channel CS, JTAG, ZDI.
eZ80F92 20 MHz eZ80® CPU, low-power modes, 128 KB + 256 B Flash, 8 KB SRAM, 24 bits GPIO,
IrDA, 2 UART, I2C, SPI, 6 Counter Timers with I/O features, WDT, RTC, 4 channel
CS + WSG, JTAG, ZDI, PLL.
eZ80F93 20 MHz eZ80® CPU, low-power modes, 64 KB + 256 B Flash, 4 KB SRAM, 24 bits GPIO,
IrDA, 2 UART, I2C, SPI, 6 Counter Timers with I/O features, WDT, RTC, 4 channel
CS + WSG, JTAG, ZDI.
Z80S180™ Improved Z80 CPU, 1 MB MMU, 2 DMA, 2 16-bit PRTs, 2 UARTs, CSIO, up to 33 MHz
clock speed.
Z80181 Z8S180 CPU, SCC, CTC, 16-bit GPIO, up to 33 MHz clock speed.
Z80182 Z8S180 CPU, 2 ESCC, 24-bit GPIO, 16550 Mimic interface, up to 33 MHz clock speed.
Z84C00 Z80® CPU (up to 20 MHz).
Z84C15 Z80® CPU, 2 SIO, 4x8 CTC, 2 PIO, WDT, up to 16 MHz clock speed.
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
6
Block Diagram
Figure 1 illustrates the block diagram of eZ80F91 MCU.
Figure 1. eZ80F91 Block Diagram
eZ80®
JTAG/ZDI
Debug
Interface
JTAG / ZDI Signals (5)
I
2
C
Serial
Interface
SCL
SDA
SPI
Serial
Parallel
Interface
SCK
SS
MISO
MOSI
UART
Universal
Asynchronous
CTS0/1
DCD0/1
DSR0/1
DTR0/1
RI0/1
RTS0/1
RxD0/1
TxD0/1
Receiver/
Transmitter
(2)
Crystal
X
IN
X
OUT
PHI
Oscillator,
PLL, and
System Clock
Generator
GPIO
8-bit General
Purpose
I/O Port
(4)
PB[7:0]
PC[7:0]
PD[7:0]
Programmable
Reload
Timer/Counter
(4)
WDT
Watchdog
Timer
Chip Select
&
Wait State
Generator
CS0
CS1
CS2
CS3
Controller
DATA[7:0]
ADDR[23:0]
DATA[7:0]
ADDR[23:0]
BUSACK
BUSREQ
WAIT
INSTRD
IORQ
NMI
MREQ
RD
WR
Interrupt
Controller
Interrupt
Vector
[8:0]
Bus
OC0/1/2/3
PWM0/1/2/3
HALT_SLP
IrDA
Encoder/
Decoder
IR_TxD
IR_RxD
IC0/1/2/3
EC0/1
256 KB
Flash
Memory
8 KB
SRAM
Real Time
Clock and
32 KHz
Oscillator
RTC_X
IN
RTC_X
OUT
RTC_V
DD
Ethernet
MAC Arbiter
8 KB
SRAM
MII Interface
Signals (18)
PLL_V
DD
LOOP_FLT
Internal
RC
Osc.
PA[7:0]
WP
PWM0/1/2/3
TOUT0/1
RESET
POR/VBO
CPU
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
7
Pin Diagrams
Figure 2 illustrates the 144-pin LQFP pin configuration of eZ80F91 MCU.
Figure 2. eZ80F91 MCU 144-Pin LQFP Pin Configuration
PB7/MOSI
PB6/MISO
PB5/IC3
PB4/IC2
PB3/SCK
PB2/SS
PB1/IC1
PB0/IC0/EC0
VSS
VDD
PC7/RI1
PC6/DCD1
PC5/DSR1
PC4/DTR1
PC3/CTS1
PC2/RTS1
PC1/RxD1
PC0/TxD1
VSS
VDD
PLL_VDD
XIN
WP
MDIO
MDC
RXD3
RXD2
RXD1
RXD0
RX_DV
RX_CLK
RX_ER
VSS
VDD
TX_ER
TX_EN
TXD0
TXD1
TXD2
COL
CRS
VSS
VDD
PA7/PWM3
PA6/PWM2/EC1
A0
A1
A2
A3
A4
VDD
VSS
A5
A6
A7
A8
A9
A10
VDD
VSS
A11
A12
A13
A14
A15
A16
VDD
VSS
A17
A18
VDD
VSS
D0
D1
D2
D3
D4
D5
D6
D7
VDD
VSS
IORQ
MREQ
RD
WR
INSTRD
WAIT
RESET
NMI
BUSREQ
BUSACK
VDD
VSS
RTC_XIN
144-Pin LQFP
1
10
20
30
40
50
60
108
100
90
73
120
130
140
144
A19
A20
A21
A22
A23
VDD
VSS
CS0
CS1
CS2
CS3
RTC_XOUT
RTC_VDD
VSS
HALT_SLP
TMS
TCK
TRIGOUT
TDI
TDO
TRST
VSS
XOUT
PLL_VSS
LOOP_FILT
VSS
VDD
PD7/RI0
PD6/DCD0
PD5/DSR0
PD4/DTR0
PD3/CTS0
PD0/TxD0/IR_TXD
PA5/PWM1/TOUT1
PA4/PWM0/TOUT0
PA3/PWM3/OC3
PA2/PWM2/OC2
PA1/PWM1/OC1
PA0/PWM0/OC0
VSS
VDD
PHI
SCL
SDA
110
36
70
80
PD2/RTS0
PD1/RxD0/IR_RXD
TXD3
TX_CLK
VSS
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
8
Table 1 lists the 144-pin BGA pin configuration of eZ80F91 MCU.
Table 1. eZ80F91 144-Pin BGA Pin Configuration
12 11 10 9 8 7 6 5 4 3 2 1
ASDA SCL PA0 PA4 PA7 COL TxD0 VDD Rx_DV MDC WPn A0
BVSS PHI PA1 PA3 VDD TxD3 Tx_EN VSS RxD1 MDIO A2 A1
CPB6 PB7 VDD PA5 VSS TxD2 Tx_CLK Rx_
CLK
RxD3 A3 VSS VDD
DPB1 PB3 PB5 VSS CRS TxD1 Rx_ER RxD2 A4 A8 A6 A7
EPC7 VDD PB0 PB4 PA2 Tx_ER RxD0 A5 A11 VSS VDD A10
FPC3 PC4 PC5 VSS PB2 PA6 A9 A17 A15 A14 A13 A12
GVSS PC0 PC1 PC2 PC6 PLL_
VSS
VSS A23 A20 VSS VDD A16
HXOUT XIN PLL_
VDD
VDD PD7 TMS VSS D5 VSS A21 A19 A18
JVSS VDD LOOP
FILT_
OUT
PD4 TRIGOUT RTC_
VDD
NMIn WRn D2 CS0n VDD A22
KPD5 PD6 PD3 TDI VSS VDD RESETn RDn VDD D1 CS2n CS1n
LPD1 PD2 TRSTn TCK RTC_
XOUT
BUSACKn WAITn MREQn D6 D4 D0 CS3n
MPD0 VSS TDO HALT_
SLPn
RTC_
XIN
BUSREQn INSTRDn IORQn D7 D3 VSS VDD
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
10
Ordering Information
You can order the eZ80F91 MCU from ZiLOG, using the part numbers in the table below. For more
information regarding ordering, please consult your local ZiLOG sales office. The ZiLOG website
www.zilog.com lists all regional offices, as well as additional eZ80Acclaim!® product information.
Part Number Description Package
eZ80F91AZA50SG eZ80F91 device, 50 MHz, Standard Temperature 144-LQFP
eZ80F91AZA50EG eZ80F91 device, 50 MHz, Extended Temperature 144-LQFP
eZ80F91NAA50SG eZ80F91 device, 50 MHz, Standard Temperature 144-BGA
eZ80F91NAA50EG eZ80F91 device, 50 MHz, Extended Temperature 144-BGA
eZ80F91AZ050SG* eZ80F91 device, 50 MHz, Standard Temperature 144-LQFP
eZ80F91AZ050EG* eZ80F91 device, 50 MHz, Extended Temperature 144-LQFP
eZ80F91NA050SG* eZ80F91 device, 50 MHz, Standard Temperature 144-BGA
eZ80F91NA050EG* eZ80F91 device, 50 MHz, Extended Temperature 144-BGA
eZ80F910300ZCOG eZ80F91 Development Kit
eZ80F910200KITG eZ80F91 Modular Development Kit
eZ80F916050MODG Ethernet Module
eZ80F916005MODG Mini-Ethernet Module
ZUSBSC00100ZACG USB Smart Cable Accessory Kit
ZENETSC0100ZACG Ethernet Smart Cable Accessory Kit
* Denotes parts not recommended for new designs.
PB013505-0607 eZ80Acclaim!® Flash Microcontrollers
eZ80F91 MCU
Product Brief
11
DO NOT USE IN LIFE SUPPORT
LIFE SUPPORT POLICY
ZiLOG'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE
SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF
THE PRESIDENT AND GENERAL COUNSEL OF ZiLOG CORPORATION.
As used herein
Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b)
support or sustain life and whose failure to perform when properly used in accordance with instructions for
use provided in the labeling can be reasonably expected to result in a significant injury to the user. A
critical component is any component in a life support device or system whose failure to perform can be
reasonably expected to cause the failure of the life support device or system or to affect its safety or
effectiveness.
Document Disclaimer
©2007 by ZiLOG, Inc. All rights reserved. Information in this publication concerning the devices,
applications, or technology described is intended to suggest possible uses and may be superseded. ZiLOG,
INC. DOES NOT ASSUME LIABILITY FOR OR PROVIDE A REPRESENTATION OF ACCURACY
OF THE INFORMATION, DEVICES, OR TECHNOLOGY DESCRIBED IN THIS DOCUMENT.
ZiLOG ALSO DOES NOT ASSUME LIABILITY FOR INTELLECTUAL PROPERTY
INFRINGEMENT RELATED IN ANY MANNER TO USE OF INFORMATION, DEVICES, OR
TECHNOLOGY DESCRIBED HEREIN OR OTHERWISE. The information contained within this
document has been verified according to the general principles of electrical and mechanical engineering.
Z8, Z8 Encore!, Z8 Encore! XP, Z8 Encore! MC, Crimzon, eZ80, eZ80Acclaim! and ZNEO are
trademarks or registered trademarks of ZiLOG, Inc. All other product or service names are the property of
their respective owners.
Warning:
