Datasheet

Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
1018 Freescale Semiconductor
24.0.5.46 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.
This bit has no effect if the port is used as output. Out of reset no pull device is enabled.
24.0.5.47 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.
Table 24-42. RDRH Field Descriptions
Field Description
7–0
RDRH[7:0]
Reduced Drive Port H
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
76543210
R
PERH7 PERH6 PERH5 PERH4 PERH3 PERH2 PERH1 PERH0
W
Reset 00000000
Figure 24-48. Port H Pull Device Enable Register (PERH)
Table 24-43. PERH Field Descriptions
Field Description
7–0
PERH[7:0]
Pull Device Enable Port H
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
76543210
R
PPSH7 PPSH6 PPSH5 PPSH4 PPSH3 PPSH2 PPSH1 PPSH0
W
Reset 00000000
Figure 24-49. Port H Polarity Select Register (PPSH)