September 2002

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

3/25

Ver 1.0 PID 8958A 09/02

SyncMOS Technologies Inc.

SM8958A

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

Port 1

Latch

Port 2

Latch

Port 3

Latch

Port 4

Latch

Port 2

Port 3

Driver & Mux

Port 4

Driver & Mux

8

8

8

4

WDT

Instruction

Register

Port 0

Latch

8

Port 1

Driver & Mux

Driver & Mux

Port 0

Driver & Mux

SPWM

32K

bytes

Flash

Memory

0000H

7FFFH

5

2