Chapter 2 Port Integration Module (S12XEP100PIMV1)
MC9S12XE-Family Reference Manual , Rev. 1.19
Freescale Semiconductor
147
2.3.57
Port H Pull Device Enable Register (PERH)
2.3.58
Port H Polarity Select Register (PPSH)
Address 0x0264
Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
7
6
5
4
3
2
1
0
R
PERH7
PERH6
PERH5
PERH4
PERH3
PERH2
PERH1
PERH0
W
Reset
0
0
0
0
0
0
0
0
Figure 2-55. Port H Pull Device Enable Register (PERH)
Table 2-53. PERH Register Field Descriptions
Field
Description
7-0
PERH
Port H pull device enable
—Enable pull devices on input pins
These bits configure whether a pull device is activated, if the associated pin is used as an input. This bit has no effect
if the pin is used as an output. Out of reset no pull device is enabled.
1 Pull device enabled.
0 Pull device disabled.
Address 0x0265
Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
7
6
5
4
3
2
1
0
R
PPSH7
PPSH6
PPSH5
PPSH4
PPSH3
PPSH2
PPSH1
PPSH0
W
Reset
0
0
0
0
0
0
0
0
Figure 2-56. Port H Polarity Select Register (PPSH)
Table 2-54. PPSH Register Field Descriptions
Field
Description
7-0
PPSH
Port H pull device select
—Determine pull device polarity on input pins
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.
1 A 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 A 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.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages