mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 156

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

Chapter 3 Port Integration Module (PIM9E256V1)
3.3.7.4
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.
3.3.7.5
Read: Anytime. Write: Anytime.
This register configures whether a pull-up or a pull-down device is activated on configured input pins. If
a pin is configured as output, the corresponding Pull Device Enable Register bit has no effect.
156
RDRU[7:0]
PERU[7:0]
Reset
Reset
Field
Field
7:0
7:0
W
W
R
R
RDRU7
PERU7
Reduced Drive Port U
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
Pull Device Enable Port U
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.
Port U Reduced Drive Register (RDRU)
Port U Pull Device Enable Register (PERU)
0
0
7
7
RDRU6
PERU6
Figure 3-46. Port U Pull Device Enable Register (PERU)
0
0
6
6
Figure 3-45. Port U Reduced Drive Register (RDRU)
Table 3-32. RDRU Field Descriptions
Table 3-33. PERU Field Descriptions
RDRU5
PERU5
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
RDRU4
PERU4
0
0
4
4
Description
Description
RDRU3
PERU3
3
0
3
0
RDRU2
PERU2
0
0
2
2
RDRU1
PERU1
Freescale Semiconductor
0
0
1
1
RDRU0
PERU0
0
0
0
0