C501G-1E SIEMENS [Siemens Semiconductor Group], C501G-1E Datasheet - Page 93

• Manufacturer Part Number: C501G-1E
• Description: 8-Bit Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

8.4
In the idle mode and in the power down mode the port pins of the C501 have a well defined status
which is listed in the following table 8-10. This state of some pins also depends on the location of
the code memory (internal or external).
Table 8-10 :
Status of External Pins During Idle and Software Power Down Mode
Outputs
ALE
PSEN
PORT 0
PORT 1
PORT 2
PORT 3
Semiconductor Group
State of Pins in Software Initiated Power Saving Modes
Idle
High
High
Data
Data
Data
Data/alternate
outputs
Last Instruction Executed from
Internal Code Memory
Power Down
Low
Low
Data
Data
Data
Data/last output
8-4
Idle
High
High
Data
Data
Address
Data/alternate
outputs
Last Instruction Executed from
External Code Memory
Power Saving Modes
Power Down
Low
Low
Float
Data
Data
Data/last output
C501