mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 149

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

3.3.5.4
Read: Anytime. Write: Anytime.
This register configures the drive strength of configured output pins as either full or reduced. If a pin is
configured as input, the corresponding Reduced Drive Register bit has no effect.
3.3.5.5
Read: Anytime. Write: Anytime.
This register configures whether a pull-up or a pull-down device is activated on configured input or
wired-OR (open drain) output pins. If a pin is configured as push-pull output, the corresponding Pull
Device Enable Register bit has no effect.
Freescale Semiconductor
RDRS[7:0]
PERS[7:0]
Reset
Reset
Field
Field
7:0
7:0
W
W
R
R
RDRS7
PERS7
Reduced Drive Port S
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
Pull Device Enable Port S
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.
Port S Reduced Drive Register (RDRS)
Port S Pull Device Enable Register (PERS)
0
1
7
7
RDRS6
PERS6
Figure 3-33. Port S Pull Device Enable Register (PERS)
0
1
6
6
Figure 3-32. Port S Reduced Drive Register (RDRS)
Table 3-23. RDRS Field Descriptions
Table 3-24. PERS Field Descriptions
RDRS5
PERS5
MC9S12E256 Data Sheet, Rev. 1.08
0
1
5
5
RDRS4
PERS4
0
1
4
4
Description
Description
RDRS3
PERS3
3
0
3
1
Chapter 3 Port Integration Module (PIM9E256V1)
RDRS2
PERS2
0
1
2
2
RDRS1
PERS1
0
1
1
1
RDRS0
PERS0
0
1
0
0
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