mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1003

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

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