TS80C51RA2 Atmel Corporation, TS80C51RA2 Datasheet - Page 44

• Manufacturer Part Number: TS80C51RA2
• Description: High Performance 8-bit Microcontroller
• Manufacturer: Atmel Corporation

44
TS8xC51Rx2
Exit from power-down by reset redefines all the SFRs, exit from power-down by external
interrupt does no affect the SFRs.
Exit from power-down by either reset or external interrupt does not affect the internal
RAM content.
Note:
Table 24. The state of ports during idle and power-down mode
* Port 0 can force a "zero" level. A "one" will leave port floating.
Power-
Power-
Mode
down
down
Idle
Idle
If idle mode is activated with power-down mode (IDL and PD bits set), the exit sequence
is unchanged, when execution is vectored to interrupt, PD and IDL bits are cleared and
idle mode is not entered.
Program
Memory
External
External
Internal
Internal
ALE
1
1
0
0
PSEN
1
1
0
0
Port Data*
Port Data*
PORT0
Floating
Floating
Port Data
Port Data
Port Data
Port Data
PORT1
Port Data
Port Data
Port Data
PORT2
Address
4188A–8051–10/02
Port Data
Port Data
Port Data
Port Data
PORT3