T89C51RD2-DDRI-M View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

T89C51RD2-DDRI-M

0 to 40 MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

T89C51RD2

• Power supply:

- M version: Commercial and industrial

4.5V to 5.5V : 40MHz X1 Mode, 20MHz X2 Mode

3V to 5.5V : 33MHz X1 Mode, 16 MHz X2 Mode

- L version: Commercial and industrial

2.7V to 3.6V : 25MHz X1 Mode, 12MHz X2 Mode

• Temperature ranges: Commercial (0 to +70°C) and industrial (-40 to +85°C).

• Packages: PDIL40, PLCC44, VQFP44, PLCC68, VQFP64

Table 1. Memory Size

PDIL40

PLCC44

Flash (bytes) EEPROM (bytes) XRAM (bytes)

TOTAL RAM

(bytes)

I/O

VQFP44 1.4

T89C51RD2

64k

2k

1024

1280

32

PLCC68

VQFP64 1.4

Flash (bytes)

EEPROM

(bytes)

XRAM (bytes)

TOTAL RAM

(bytes)

I/O

T89C51RD2

64k

2k

1024

1280

48

3. Block Diagram

XTAL1

XTAL2

ALE/ PROG

PSEN

EA

RD (3)

WR (3)

(3) (3)

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

EUART

RAM

256x8

Flash

64Kx8

CPU

C51

CORE

IB-bus

XRAM EEPROM

1Kx8

2Kx8

PCA

Timer2

Timer 0 INT

Timer 1 Ctrl

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

Parallel I/O Ports & Ext. Bus

Port

0

Port

1

Port

2

Port

3

Port

(2)

4

Port 5

(2)

Watch

Dog

(1): Alternate function of Port 1

(2): Only available on high pin count packages

(3): Alternate function of Port 3

2

Rev. F - 15 February, 2001

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