mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 940

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

Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)
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.
940
RDRM[7:0]
PERM[7:0]
Reset
Reset
Field
Field
7–0
7–0
W
W
R
R
RDRM7
PERM7
Reduced Drive Port M
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
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.
0
0
7
7
RDRM6
PERM6
Figure 23-36. Port M Pull Device Enable Register (PERM)
0
0
6
6
Figure 23-35. Port M Reduced Drive Register (RDRM)
Table 23-34. RDRM Field Descriptions
Table 23-35. PERM Field Descriptions
RDRM5
PERM5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
5
RDRM4
PERM4
0
0
4
4
Description
Description
RDRM3
PERM3
0
0
3
3
RDRM2
PERM2
0
0
2
2
RDRM1
PERM1
Freescale Semiconductor
0
0
1
1
RDRM0
PERM0
0
0
0
0