mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 138

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

Chapter 3 Port Integration Module (PIM9E256V1)
3.3.2.4
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.
3.3.2.5
Read: Anytime. Write: Anytime.
This register configures whether a pull-up or a pull-down device is activated on configured input or
wired-OR output pins. If a pin is configured as push-pull output, the corresponding Pull Device Enable
Register bit has no effect.
138
RDRM[7:3,
PERM[7:3,
7:3, 1:0
7:3, 1:0
Reset
Reset
Field
Field
1:0]
1:0]
W
W
R
R
RDRM7
PERM7
Reduced Drive Port M
0 Full drive strength at output
1 Associated pin drives at about 1/3 of the full drive strength.
Pull Device Enable Port M
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.
Port M Reduced Drive Register (RDRM)
Port M Pull Device Enable Register (PERM)
0
0
7
7
= Reserved or Unimplemented
= Reserved or Unimplemented
RDRM6
PERM6
Figure 3-14. Port M Pull Device Enable Register (PERM)
0
0
6
6
Figure 3-13. Port M Reduced Drive Register (RDRM)
Table 3-10. RDRM Field Descriptions
Table 3-11. PERM Field Descriptions
RDRM5
PERM5
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
RDRM4
PERM4
0
0
4
4
Description
Description
RDRM3
PERM3
3
0
3
0
0
0
0
0
2
2
RDRM1
PERM1
Freescale Semiconductor
0
0
1
1
RDRM0
PERM0
0
0
0
0