Siemens EF 88H Series Manual de usuario descargar pdf (Pagina 93)

Power Saving Modes

C501

Semiconductor Group 8-4

8.4 State of Pins in Software Initiated Power Saving Modes

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 Last Instruction Executed from

Internal Code Memory

Last Instruction Executed from

External Code Memory

Idle Power Down Idle Power Down

ALE High Low High Low

PSEN

High Low High Low

PORT 0 Data Data Data Float

PORT 1 Data Data Data Data

PORT 2 Data Data Address Data

PORT 3 Data/alternate

outputs

Data/last output Data/alternate

outputs

Data/last output

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 120 121

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Siemens EF 88H Series Manual de usuario Pagina 93