Datasheet

Chapter 2 Port Integration Module (S12XEPIMV1)
MC9S12XE-Family Reference Manual Rev. 1.25
134 Freescale Semiconductor
2.3.40 Port M Reduced Drive Register (RDRM)
2.3.41 Port M Pull Device Enable Register (PERM)
Address 0x0253 Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
76543210
R
RDRM7 RDRM6 RDRM5 RDRM4 RDRM3 RDRM2 RDRM1 RDRM0
W
Reset 00000000
Figure 2-38. Port M Reduced Drive Register (RDRM)
Table 2-36. RDRM Register Field Descriptions
Field Description
7-0
RDRM
Port M reduced drive—Select reduced drive for outputs
This register configures the drive strength of Port M output pins 7 through 0 as either full or reduced independent of
the function used on the pins. If a pin is used as input this bit has no effect.
1 Reduced drive selected (approx. 1/5 of the full drive strength).
0 Full drive strength enabled.
Address 0x0254 Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
76543210
R
PERM7 PERM6 PERM5 PERM4 PERM3 PERM2 PERM1 PERM0
W
Reset 00000000
Figure 2-39. Port M Pull Device Enable Register (PERM)
Table 2-37. PERM Register Field Descriptions
Field Description
7-0
PERM
Port M pull device enable—Enable pull-up devices on input pins
These bits configure whether a pull device is activated, if the associated pin is used as an input or wired-or output.
This bit has no effect if the pin is used as push-pull output. Out of reset no pull device is enabled.
1 Pull device enabled.
0 Pull device disabled.