mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 945

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

RDRP[7:0]
PERP[7:0]
Reset
Reset
Field
23.0.5.42 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.
Field
23.0.5.43 Port P Polarity Select Register (PPSP)
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.
7–0
7–0
W
W
R
R
PERP7
PPSP7
Reduced Drive Port P
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
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
0
7
0
PERP6
PPSP6
Figure 23-44. Port P Pull Device Enable Register (PERP)
0
0
6
6
Figure 23-45. Port P Polarity Select Register (PPSP)
Table 23-40. RDRP Field Descriptions
Table 23-41. PERP Field Descriptions
PERP5
PPSP5
5
0
5
0
PERP4
PPSP4
0
0
4
4
Description
Description
PERP3
PPSP3
3
0
3
0
PERP2
PPSP2
0
0
2
2
PERP1
PPSP1
1
0
1
0
PERP0
PPSP0
0
0
0
0