AT80C51RA2 データシートの表示（PDF） - International Rectifier

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AT80C51RA2

High Performance 8-bit Microcontroller

International Rectifier 

3. Block Diagram

AT/TS8xC51Rx2

XTAL1

XTAL2

ALE/ PROG

PSEN

EA/VPP

RD (3)

WR (3)

(3) (3)

(1) (1) (1) (1)

EUART

RAM

256x8

ROM

/EPROM

XRAM

0/16/32/64Kx8 256/768x8

PCA

Timer2

CPU

C51

CORE

IB-bus

Timer 0 INT

Timer 1 Ctrl

(3) (3) (3) (3)

Parallel I/O Ports & Ext. Bus

Port

0Port

1

Port

2

Port

3

Port

(2)

4

Port

(2)

5

Watch

Dog

(1): Alternate function of Port 1

(2): Only available on high pin count packages

(3): Alternate function of Port 3

3

4188E–8051–08/06

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