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Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
1014
Freescale Semiconductor
24.0.5.38 Port P Pull Device Enable Register (PERP)
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.
24.0.5.39 Port P Polarity Select Register (PPSP)
Read: Anytime.
Write: Anytime.
Thisregisterservesadualpurposebyselectingthepolarityoftheactiveinterruptedgeaswellasselecting
a pull-up or pull-down device if enabled.
Table 24-36. RDRP Field Descriptions
Field
Description
7–0
RDRP[7:0]
Reduced Drive Port P
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
PERP7
PERP6
PERP5
PERP4
PERP3
PERP2
PERP1
PERP0
W
Reset
0
0
0
0
0
0
0
0
Figure 24-40. Port P Pull Device Enable Register (PERP)
Table 24-37. PERP Field Descriptions
Field
Description
7–0
PERP[7:0]
Pull Device Enable Port P
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
PPSP7
PPSP6
PPSP5
PPSP4
PPSP3
PPSP2
PPSP1
PPSP0
W
Reset
0
0
0
0
0
0
0
0
Figure 24-41. Port P Polarity Select Register (PPSP)