Datasheet
Chapter 2 Port Integration Module (PIM9C32) Block Description
Freescale Semiconductor MC9S12C-Family / MC9S12GC-Family 91
Rev 01.24
2.3.2.3.4 Port M Reduced Drive Register (RDRM)
Read: Anytime.
Write: Anytime.
2.3.2.3.5 Port M Pull Device Enable Register (PERM)
Read: Anytime.
Write: Anytime.
Module Base + 0x0013
76543210
R0 0
RDRM5 RDRM4 RDRM3 RDRM2 RDRM1 RDRM0
W
Reset 0 0 0 00000
= Unimplemented or Reserved
Figure 2-20. Port M Reduced Drive Register (RDRM)
Table 2-18. RDRM Field Descriptions
Field Description
5–0
RDRM[5:0]
Reduced Drive Port M — 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.
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
Module Base + 0x0014
76543210
R0 0
PERM5 PERM4 PERM3 PERM2 PERM1 PERM0
W
Reset 0 0 1 11111
= Unimplemented or Reserved
Figure 2-21. Port M Pull Device Enable Register (PERM)
Table 2-19. PERM Field Descriptions
Field Description
5–0
PERM[5:0]
Pull Device Enable Port M — This register configures whether a pull-up or a pull-down device is activated, if
the port is used as input or as output in wired-or (open drain) mode. This bit has no effect if the port is used as
push-pull output. Out of reset a pull-up device is enabled.
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.