
Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
940
Freescale Semiconductor
23.0.5.33 Port M Reduced Drive Register (RDRM)
Read: Anytime.
Write: Anytime.
This register configures the drive strength of each Port M output pin as either full or reduced. If the port
is used as input this bit is ignored.
23.0.5.34 Port M Pull Device Enable Register (PERM)
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 or
wired-OR output. This bit has no effect if the port is used as push-pull output. Out of reset no pull device
is enabled.
7
6
5
4
3
2
1
0
R
RDRM7
RDRM6
RDRM5
RDRM4
RDRM3
RDRM2
RDRM1
RDRM0
W
Reset
0
0
0
0
0
0
0
0
Figure 23-35. Port M Reduced Drive Register (RDRM)
Table 23-34. RDRM Field Descriptions
Field
Description
7–0
RDRM[7:0]
Reduced Drive Port M
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
PERM7
PERM6
PERM5
PERM4
PERM3
PERM2
PERM1
PERM0
W
Reset
0
0
0
0
0
0
0
0
Figure 23-36. Port M Pull Device Enable Register (PERM)
Table 23-35. PERM Field Descriptions
Field
Description
7–0
PERM[7:0]
Pull Device Enable Port M
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.