PC912XDP512F0MPVR datasheet(850/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

852

Freescale Semiconductor

22.3.2.33 Port M Reduced Drive Register (RDRM)

Read: Anytime.

Write: Anytime.

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

is used as input this bit is ignored.

22.3.2.34 Port M Pull Device Enable Register (PERM)

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

wired-OR output. This bit has no effect if the port is used as push-pull output. Out of reset no pull device

is enabled.

76543210

RDRM7

RDRM6

RDRM5

RDRM4

RDRM3

RDRM2

RDRM1

RDRM0

Reset

00000000

Figure 22-35. Port M Reduced Drive Register (RDRM)

Table 22-34. RDRM Field Descriptions

Field

Description

7–0

RDRM[7:0]

Reduced Drive Port M

0 Full drive strength at output.

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

76543210

PERM7

PERM6

PERM5

PERM4

PERM3

PERM2

PERM1

PERM0

Reset

00000000

Figure 22-36. Port M Pull Device Enable Register (PERM)

Table 22-35. PERM Field Descriptions

Field

Description

7–0

PERM[7:0]

Pull Device Enable Port M

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

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

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