C508_01 Datasheet, PDF (246/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
Power Saving Modes
9.5
State of Pins in Software Initiated Power Saving Modes
In the idle mode and in the power-down mode, the status of port pins of the C508 is well
defined status. They are listed in Table 9-1. This state of some pins also depends on the
location of the code memory (internal or external).
Table 9-1 Status of External Pins During Idle and Software Power Down Mode
Outputs
Last Instruction Executed from Last Instruction Executed from
Internal Code Memory
External Code Memory
Idle
Power Down Idle
Power Down
ALE
High
Low
High
Low
PSEN
High
Low
High
Low
PORT 0
Data
Data
Float
Float
PORT 2
Data
Data
Address
Data
PORT 1, 3, 4, 5 Data /
alternate
outputs
Data /
last output
Data /
Data /
alternate outputs last output
User’s Manual
9-10
2001-05