MC9S12NE64_06 Datasheet, PDF (125/554 Pages) Freescale Semiconductor, Inc – Microcontrollers

Memory Map and Register Descriptions
3.3.2.4.5 Pull Device Enable Register (PERH)
Module Base + $1C
Read:
Write:
Reset:
Bit 7
0
—
6
PERH6
0
5
PERH5
0
4
PERH4
0
3
PERH3
0
2
PERH2
0
1
PERH1
0
Bit 0
PERH0
0
= Reserved or unimplemented
Figure 3-27. Port H Pull Device Enable Register (PERH)
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.
These bits have no effect if the port is used as output. Out of reset no pull device is enabled.
PERH[6:0] — Pull Device Enable Port H
1 = Either a pull-up or pull-down device is enabled.
0 = Pull-up or pull-down device is disabled.
3.3.2.4.6 Polarity Select Register (PPSH)
Module Base + $1D
Read:
Write:
Reset:
Bit 7
0
—
6
PPSH6
0
5
PPSH5
0
4
PPSH4
0
3
PPSH3
0
2
PPSH2
0
1
PPSH1
0
Bit 0
PPSH0
0
= Reserved or unimplemented
Figure 3-28. Port H Polarity Select Register (PPSH)
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.
PPSH[6:0] — Pull Select Port H
1 = Rising edge on the associated port H pin sets the associated flag bit in the PIFH register.A
pull-down device is connected to the associated port H pin, if enabled by the associated bit in
register PERH and if the port is used as input.
0 = Falling edge on the associated port H pin sets the associated flag bit in the PIFH register.A
pull-up device is connected to the associated port H pin, if enabled by the associated bit in
register PERH and if the port is used as input.
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
125