PC912XDP512F0MPVR datasheet(862/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

864

Freescale Semiconductor

22.3.2.49 Port H Reduced Drive Register (RDRH)

Read: Anytime.

Write: Anytime.

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

used as input this bit is ignored.

22.3.2.50 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.

76543210

RDRH7

RDRH6

RDRH5

RDRH4

RDRH3

RDRH2

RDRH1

RDRH0

Reset

00000000

Figure 22-51. Port H Reduced Drive Register (RDRH)

Table 22-46. 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 22-52. Port H Pull Device Enable Register (PERH)

Table 22-47. 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.

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