AT89C55WD(2002) データシートの表示（PDF） - Atmel Corporation

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AT89C55WD
(Rev.:2002)

8-bit Microcontroller with 20K Bytes Flash

Atmel Corporation 

Block Diagram

VCC

GND

RAM ADDR.

REGISTER

P0.0 - P0.7

PORT 0 DRIVERS

P2.0 - P2.7

PORT 2 DRIVERS

RAM

PORT 0

LATCH

PORT 2

LATCH

QUICK

FLASH

AT89C55WD

B

REGISTER

ACC

STACK

POINTER

PROGRAM

ADDRESS

REGISTER

PSEN

ALE/PROG

EA / VPP

RST

TMP2

TMP1

ALU

PSW

INTERRUPT, SERIAL PORT,

AND TIMER BLOCKS

TIMING

AND

CONTROL

INSTRUCTION

REGISTER

OSC

WATCH

DOG

PORT 1

LATCH

PORT 1 DRIVERS

PORT 3

LATCH

PORT 3 DRIVERS

P1.0 - P1.7

P3.0 - P3.7

BUFFER

PC

INCREMENTER

PROGRAM

COUNTER

DUAL

DPTR

3

1921B–MICRO–09/02

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