MC9S12NE64CPVE Datasheet, PDF (115/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64 Device Overview

Memory Map and Register Descriptions
3.3.2.1.5 Pull Device Enable Register (PERT)
Module Base + $4
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
Write: ^{PERT7 PERT6 PERT5 PERT4}
Reset:
0
0
0
0
—
—
—
—
= Reserved or unimplemented
Figure 3-6. 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.
PERT[7:4] — Pull Device Enable Port T
1 = Either a pull-up or pull-down device is enabled.
0 = Pull-up or pull-down device is disabled.
3.3.2.1.6 Polarity Select Register (PPST)
Module Base + $5
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
Write: ^PPST7
PPST6
PPST5
PPST4
Reset:
0
0
0
0
—
—
—
—
= Reserved or unimplemented
Figure 3-7. 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.
PPST[7:4] — Pull Select Port T
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.
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.
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
115