PC912XDP512F0MPVR datasheet(1004/1348 Pages) FREESCALE

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Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

1006

Freescale Semiconductor

Write: Anytime.

This register configures whether a pull-up or a pull-down device is activated, if the port is used as input or

as output in wired-OR (open drain) mode. This bit has no effect if the port is used as push-pull output. Out

of reset a pull-up device is enabled.

24.0.5.24 Port S Polarity Select Register (PPSS)

Read: Anytime.

Write: Anytime.

This register selects whether a pull-down or a pull-up device is connected to the pin.

24.0.5.25 Port S Wired-OR Mode Register (WOMS)

Read: Anytime.

Write: Anytime.

Table 24-25. PERS Field Descriptions

Field

Description

7–0

PERS[7:0]

Pull Device Enable Port S

0 Pull-up or pull-down device is disabled.

1 Either a pull-up or pull-down device is enabled.

76543210

PPSS7

PPSS6

PPSS5

PPSS4

PPSS3

PPSS2

PPSS1

PPSS0

Reset

00000000

Figure 24-26. Port S Polarity Select Register (PPSS)

Table 24-26. PPSS Field Descriptions

Field

Description

7–0

PPSS[7:0]

Pull Select Port S

0 A pull-up device is connected to the associated port S pin, if enabled by the associated bit in register PERS

and if the port is used as input or as wired-OR output.

1 A pull-down device is connected to the associated port S pin, if enabled by the associated bit in register PERS

and if the port is used as input.

76543210

WOMS7

WOMS6

WOMS5

WOMS4

WOMS3

WOMS2

WOMS1

WOMS0

Reset

00000000

Figure 24-27. Port S Wired-OR Mode Register (WOMS)

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