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Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
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.
Thisregisterservesadualpurposebyselectingthepolarityoftheactiveinterruptedgeaswellasselecting
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.
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 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.
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 24-49. Port H Polarity Select Register (PPSH)