Datasheet

Chapter 3 Port Integration Module (PIM9E128V1)
MC9S12E128 Data Sheet, Rev. 1.07
Freescale Semiconductor 157
3.3.7.4 Port U Reduced Drive Register (RDRU)
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 Port U Pull Device Enable Register (PERU)
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.
76543210
R
RDRU7 RDRU6 RDRU5 RDRU4 RDRU3 RDRU2 RDRU1 RDRU0
W
Reset 0 0 0 00000
Figure 3-45. Port U Reduced Drive Register (RDRU)
Table 3-32. RDRT Field Descriptions
Field Description
7:0
RDRU[7:0]
Reduced Drive Port U
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
76543210
R
PERU7 PERU6 PERU5 PERU4 PERU3 PERU2 PERU1 PERU0
W
Reset 0 0 0 00000
Figure 3-46. Port T Pull Device Enable Register (PERT)
Table 3-33. PERT Field Descriptions
Field Description
7:0
PERU[7:0]
Pull Device Enable Port U
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.