T89C51RD2 ATMEL Corporation, T89C51RD2 Datasheet - Page 42

• Manufacturer Part Number: T89C51RD2
• Description: 0 to 40MHz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL Corporation

T89C51RD2
This table shows the state of ports during idle and power-down modes.
* Port 0 can force a 0 level. A "one" will leave port floating.
42
Power Down
Power Down
Mode
Idle
Idle
Program
Memory
External
External
Internal
Internal
ALE
1
1
0
0
PSEN
1
1
0
0
Port Data*
Port Dat*
PORT0
Floating
Floating
Port Data
Port Data
Port Data
Port Data
PORT1
Rev. F - 15 February, 2001
Port Data
Port Data
Port Data
PORT2
Address
Port Data
Port Data
Port Data
Port Data
PORT3