May 2001

Specifications subject to change without notice,contact your sales representatives for the most recent information.

3/19

Ver 1.3

PID 89516 05/01

SyncMOS Technologies Inc.

SM89516

Timer 2

Timer 1

Timer 0

Stack

Pointer

Decoder &

Register

1024 bytes

RAM

Block Diagram

Reset

Circuit

Power

Circuit

Interrupt

Circuit

Timing

Generator

XTAL2

XTAL1

#EA

ALE

#PSEN

RES

Vdd

Vss

to pertinent blocks

to whole chip

to pertinent blocks

to whole system

Acc

Buffer2

Buffer1

ALU

PSW

Buffer

DPTR

PC

Incrementer

Program

Counter

Register

64K

bytes

Flash

Memory

Port 1

Latch

Port 2

Latch

Port 3

Latch

Port 4

Latch

Port 0

Driver & Mux

Port 2

Driver & Mux

Port 3

Driver & Mux

Port 4

Driver & Mux

8

8

8

4

WDT

Instruction

Register

Port 0

Latch

Port 1

Driver & Mux

8