PC912XDP512F0MPVR datasheet(844/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

846

Freescale Semiconductor

22.3.2.26 Port S Reduced Drive Register (RDRS)

Read: Anytime.

Write: Anytime.

This register configures the drive strength of each port S output pin as either full or reduced. If the port is

used as input this bit is ignored.

22.3.2.27 Port S Pull Device Enable Register (PERS)

Read: Anytime.

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.

76543210

RDRS7

RDRS6

RDRS5

RDRS4

RDRS3

RDRS2

RDRS1

RDRS0

Reset

00000000

Figure 22-28. Port S Reduced Drive Register (RDRS)

Table 22-28. RDRS Field Descriptions

Field

Description

7–0

RDRS[7:0]

Reduced Drive Port S

0 Full drive strength at output.

1 Associated pin drives at about 1/6 of the full drive strength.

76543210

PERS7

PERS6

PERS5

PERS4

PERS3

PERS2

PERS1

PERS0

Reset

11111111

Figure 22-29. Port S Pull Device Enable Register (PERS)

Table 22-29. 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.

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