PC312XDP512F0CFVR datasheet(1016/1348 Pages) FREESCALE

1016 / 1348 page

Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

1018

Freescale Semiconductor

24.0.5.46 Port H Pull Device Enable Register (PERH)

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.

This bit has no effect if the port is used as output. Out of reset no pull device is enabled.

24.0.5.47 Port H Polarity Select Register (PPSH)

Read: Anytime.

Write: Anytime.

This register serves a dual purpose by selecting the polarity of the active interrupt edge as well as selecting

a pull-up or pull-down device if enabled.

Table 24-42. RDRH Field Descriptions

Field

Description

7–0

RDRH[7:0]

Reduced Drive Port H

0 Full drive strength at output.

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

76543210

PERH7

PERH6

PERH5

PERH4

PERH3

PERH2

PERH1

PERH0

Reset

00000000

Figure 24-48. Port H Pull Device Enable Register (PERH)

Table 24-43. PERH Field Descriptions

Field

Description

7–0

PERH[7:0]

Pull Device Enable Port H

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

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

76543210

PPSH7

PPSH6

PPSH5

PPSH4

PPSH3

PPSH2

PPSH1

PPSH0

Reset

00000000

Figure 24-49. Port H Polarity Select Register (PPSH)

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