PC912XDP512F0MPVR datasheet(869/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

871

22.3.2.57 Port J Reduced Drive Register (RDRJ)

Read: Anytime.

Write: Anytime.

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

used as input this bit is ignored.

22.3.2.58 Port J Pull Device Enable Register (PERJ)

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

device is enabled.

76543210

RDRJ7

RDRJ6

RDRJ5

RDRJ4

RDRJ2

RDRJ1

RDRJ0

Reset

00000000

= Unimplemented or Reserved

Figure 22-59. Port J Reduced Drive Register (RDRJ)

Table 22-53. RDRJ Field Descriptions

Field

Description

7–0

RDRJ[7:4]

RDRJ[2:0]

Reduced Drive Port J

0 Full drive strength at output.

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

76543210

PERJ7

PERJ6

PERJ5

PERJ4

PERJ2

PERJ1

PERJ0

Reset

11110111

= Unimplemented or Reserved

Figure 22-60. Port J Pull Device Enable Register (PERJ)

Table 22-54. PERJ Field Descriptions

Field

Description

7–0

PERJ[7:4]

PERJ[2:0]

Pull Device Enable Port J

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

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

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