PC912XDP512F0MPVR datasheet(931/1348 Pages) FREESCALE

931 / 1348 page

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

port is used as input this bit is ignored.

23.0.5.21 Port T Pull Device Enable Register (PERT)

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.

23.0.5.22 Port T Polarity Select Register (PPST)

Read: Anytime.

Write: Anytime.

This register selects whether a pull-down or a pull-up device is connected to the pin.

Table 23-24. RDRT Field Descriptions

Field

Description

7–0

RDRT[7:0]

Reduced Drive Port T

0 Full drive strength at output.

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

76543210

PERT7

PERT6

PERT5

PERT4

PERT3

PERT2

PERT1

PERT0

Reset

00000000

Figure 23-23. Port T Pull Device Enable Register (PERT)

Table 23-25. PERT Field Descriptions

Field

Description

7–0

PERT[7:0]

Pull Device Enable Port T

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

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

76543210

PPST7

PPST6

PPST5

PPST4

PPST3

PPST2

PPST1

PPST0

Reset

00000000

Figure 23-24. Port T Polarity Select Register (PPST)

PC912XDP512F0MPVR 데이터시트(PDF) 931 Page - Freescale Semiconductor, Inc

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