
Chapter 4 Port Integration Module (PIM9HZ256V2)
MC9S12HZ256 Data Sheet, Rev. 2.01
Freescale Semiconductor
157
4.3.1.4
Port AD Reduced Drive Register (RDRAD)
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.
4.3.1.5
Port AD Pull Device Enable Register (PERAD)
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
RDRAD7
RDRAD6
RDRAD5
RDRAD4
RDRAD3
RDRAD2
RDRAD1
RDRAD0
W
Reset
0
00000
Figure 4-5. Port AD Reduced Drive Register (RDRAD)
Table 4-4. RDRAD Field Descriptions
Field
Description
7:0
RDRAD[7:0]
Reduced Drive Port AD
0 Full drive strength at output.
1 Associated pin drives at about 1/3 of the full drive strength.
76543210
R
PERAD7
PERAD6
PERAD5
PERAD4
PERAD3
PERAD2
PERAD1
PERAD0
W
Reset
0
00000
Figure 4-6. Port AD Pull Device Enable Register (PERAD)
Table 4-5. PERAD Field Descriptions
Field
Description
7:0
PERAD[7:0]
Pull Device Enable Port AD
0 Pull-up or pull-down device is disabled.
1 Pull-up or pull-down device is enabled.