Datasheet

Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
858 Freescale Semiconductor
22.3.2.41 Port P Reduced Drive Register (RDRP)
Read: Anytime.
Write: Anytime.
This register configures the drive strength of each port P output pin as either full or reduced. If the port is
used as input this bit is ignored.
22.3.2.42 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.
76543210
R
RDRP7 RDRP6 RDRP5 RDRP4 RDRP3 RDRP2 RDRP1 RDRP0
W
Reset 00000000
Figure 22-43. Port P Reduced Drive Register (RDRP)
Table 22-40. 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.
76543210
R
PERP7 PERP6 PERP5 PERP4 PERP3 PERP2 PERP1 PERP0
W
Reset 00000000
Figure 22-44. Port P Pull Device Enable Register (PERP)
Table 22-41. 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.