T89C51RD2-SLRI-L View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

T89C51RD2-SLRI-L

0 to 40 MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

T89C51RD2

This table shows the state of ports during idle and power-down modes.

Mode

Idle

Idle

Power Down

Power Down

Program

Memory

Internal

External

Internal

External

ALE

1

1

0

0

PSEN

1

1

0

0

PORT0

Port Data*

Floating

Port Dat*

Floating

PORT1

Port Data

Port Data

Port Data

Port Data

* Port 0 can force a 0 level. A "one" will leave port floating.

PORT2

Port Data

Address

Port Data

Port Data

PORT3

Port Data

Port Data

Port Data

Port Data

42

Rev. F - 15 February, 2001

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