AT89C51ED2-SLRUM データシートの表示（PDF） - Atmel Corporation

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AT89C51ED2-SLRUM

8-bit Flash Microcontroller

Atmel Corporation 

2. Block Diagram

Figure 2-1. Block Diagram

AT89C51RD2/ED2

(2) (2)

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

(1)

XTALA1

XTALA2

ALE/ PROG

PSEN

EA

RD (2)

WR (2)

EUART

RAM

256x8

Flash

64K x 8

CPU

C51

CORE

IB-bus

XRAM

1792 x 8

PCA

Timer2 Keyboard

Watch

-dog

EEPROM*

2K x 8

(AT89C51ED2)

Timer 0 INT

Timer 1 Ctrl

Parallel I/O Ports &

External Bus

Port 0 Port 1Port 2 Port 3 Port4 Port 5

BOOT Regulator

SPI

2K x 8 POR / PFD

ROM

(2) (2) (2) (2)

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

(1): Alternate function of Port 1

(2): Alternate function of Port 3

3

4235K–8051–05/08

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