MC9S12XD256MAL Datasheet, PDF (1001/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

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.
Table 24-21. PERT Field Descriptions
Field
Description
7–0
Pull Device Enable Port T
PERT[7:0] 0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
24.0.5.18 Port T Polarity Select Register (PPST)
R
W
Reset
7
PPST7
0
6
PPST6
5
PPST5
4
PPST4
3
PPST3
2
PPST2
0
0
0
0
0
Figure 24-20. Port T Polarity Select Register (PPST)
1
PPST1
0
Read: Anytime.
Write: Anytime.
This register selects whether a pull-down or a pull-up device is connected to the pin.
Table 24-22. PPST Field Descriptions
0
PPST0
0
Field
Description
7–0
PPST[7:0]
Pull Select Port T
0 A pull-up device is connected to the associated port T pin, if enabled by the associated bit in register PERT
and if the port is used as input.
1 A pull-down device is connected to the associated port T pin, if enabled by the associated bit in register PERT
and if the port is used as input.
24.0.5.19 Port S Data Register (PTS)
R
W
SCI/SPI
Reset
7
PTS7
SS0
0
Read: Anytime.
Write: Anytime.
6
PTS6
SCK0
0
5
PTS5
4
PTS4
3
PTS3
2
PTS2
MOSI0
MISO0
TXD1
RXD1
0
0
0
0
Figure 24-21. Port S Data Register (PTS)
1
PTS1
TXD0
0
0
PTS0
RXD0
0