PC912XDP512F0MPVR datasheet(1003/1348 Pages) FREESCALE

1003 / 1348 page

If the associated SCI transmit or receive channel is enabled this register has no effect on the pins.

The pin is forced to be an output if a SCI transmit channel is enabled, it is forced to be an input if

the SCI receive channel is enabled.

The DDRS bits revert to controlling the I/O direction of a pin when the associated channel is

disabled.

24.0.5.22 Port S Reduced Drive Register (RDRS)

Read: Anytime.

Write: Anytime.

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

port is used as input this bit is ignored.

24.0.5.23 Port S Pull Device Enable Register (PERS)

Read: Anytime.

Table 24-23. DDRS Field Descriptions

Field

Description

7–0

DDRS[7:0]

Data Direction Port S

0 Associated pin is conﬁgured as input.

1 Associated pin is conﬁgured as output.

Note: Due to internal synchronization circuits, it can take up to 2 bus clock cycles until the correct value is read

on PTS or PTIS registers, when changing the DDRS register.

76543210

RDRS7

RDRS6

RDRS5

RDRS4

RDRS3

RDRS2

RDRS1

RDRS0

Reset

00000000

Figure 24-24. Port S Reduced Drive Register (RDRS)

Table 24-24. RDRS Field Descriptions

Field

Description

7–0

RDRS[7:0]

Reduced Drive Port S

0 Full drive strength at output.

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

76543210

PERS7

PERS6

PERS5

PERS4

PERS3

PERS2

PERS1

PERS0

Reset

11111111

Figure 24-25. Port S Pull Device Enable Register (PERS)

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