MC9S12C_10 Datasheet, PDF (91/690 Pages) Freescale Semiconductor, Inc – Reference Manual

2.3.2.3.4
Chapter 2 Port Integration Module (PIM9C32) Block Description
Port M Reduced Drive Register (RDRM)
Module Base + 0x0013
7
R
0
W
Reset
0
Read: Anytime.
Write: Anytime.
6
5
4
3
2
0
RDRM5
RDRM4
RDRM3
RDRM2
0
0
0
0
0
= Unimplemented or Reserved
Figure 2-20. Port M Reduced Drive Register (RDRM)
Table 2-18. RDRM Field Descriptions
1
RDRM1
0
0
RDRM0
0
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.
2.3.2.3.5 Port M Pull Device Enable Register (PERM)
Module Base + 0x0014
7
R
0
W
Reset
0
Read: Anytime.
Write: Anytime.
6
5
4
3
2
1
0
PERM5
PERM4
PERM3
PERM2
PERM1
0
1
1
1
1
1
= Unimplemented or Reserved
Figure 2-21. Port M Pull Device Enable Register (PERM)
Table 2-19. PERM Field Descriptions
0
PERM0
1
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.
Freescale Semiconductor
MC9S12C-Family / MC9S12GC-Family
91
Rev 01.24