User manual

PB013502-0104 eZ80Acclaim!™ Flash Microcontrollers
eZ80F91 Product Brief
5
Block Diagram
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
MOS
I
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
CPU
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
256KB
Flash
Memory
8KB
SRAM
Real-Time
Clock and
32KHz
Oscillator
RTC_X
IN
RTC_X
OUT
RTC_V
DD
Ethernet
MAC
Arbiter
8KB
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
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