mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1014

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

Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)
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.
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.
1014
RDRP[7:0]
PERP[7:0]
Reset
Reset
Field
Field
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.
0
0
7
7
PERP6
PPSP6
Figure 24-40. Port P Pull Device Enable Register (PERP)
0
0
6
6
Figure 24-41. Port P Polarity Select Register (PPSP)
Table 24-36. RDRP Field Descriptions
Table 24-37. PERP Field Descriptions
PERP5
PPSP5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
5
PERP4
PPSP4
0
0
4
4
Description
Description
PERP3
PPSP3
0
0
3
3
PERP2
PPSP2
0
0
2
2
PERP1
PPSP1
Freescale Semiconductor
0
0
1
1
PERP0
PPSP0
0
0
0
0