PC312XDP512F0CFVR datasheet(945/1350 Pages) FREESCALE

tên linh kiện	PC312XDP512F0CFVR

Giải thích chi tiết về linh kiện	Covers, S12XD, S12XB & S12XA Families

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23.0.5.42 Port P Pull Device Enable Register (PERP)

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.

23.0.5.43 Port P Polarity Select Register (PPSP)

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 23-40. RDRP Field Descriptions

Field

Description

7–0

RDRP[7:0]

Reduced Drive Port P

0 Full drive strength at output.

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

76543210

PERP7

PERP6

PERP5

PERP4

PERP3

PERP2

PERP1

PERP0

Reset

00000000

Figure 23-44. Port P Pull Device Enable Register (PERP)

Table 23-41. PERP Field Descriptions

Field

Description

7–0

PERP[7:0]

Pull Device Enable Port P

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

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

76543210

PPSP7

PPSP6

PPSP5

PPSP4

PPSP3

PPSP2

PPSP1

PPSP0

Reset

00000000

Figure 23-45. Port P Polarity Select Register (PPSP)

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