S912XEG384J3VA Datasheet, PDF (134/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

Chapter 2 Port Integration Module (S12XEPIMV1)
2.3.40 Port M Reduced Drive Register (RDRM)
Address 0x0253
R
W
Reset
7
RDRM7
0
1. Read: Anytime.
Write: Anytime.
6
RDRM6
5
RDRM5
4
RDRM4
3
RDRM3
2
RDRM2
0
0
0
0
0
Figure 2-38. Port M Reduced Drive Register (RDRM)
Access: User read/write⁽¹⁾
1
0
RDRM1
RDRM0
0
0
Table 2-36. RDRM Register Field Descriptions
Field
7-0
RDRM
Description
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.
2.3.41 Port M Pull Device Enable Register (PERM)
Address 0x0254
R
W
Reset
7
PERM7
0
1. Read: Anytime.
Write: Anytime.
6
PERM6
5
PERM5
4
PERM4
3
PERM3
2
PERM2
Access: User read/write⁽¹⁾
1
0
PERM1
PERM0
0
0
0
0
0
0
0
Figure 2-39. Port M Pull Device Enable Register (PERM)
Table 2-37. PERM Register Field Descriptions
Field
7-0
PERM
Description
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.
MC9S12XE-Family Reference Manual Rev. 1.25
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