MC9S12KG128_10 Datasheet, PDF (160/606 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 4 Port Integration Module (PIM9KG128V1)
4.3.4.4 Port P Reduced Drive Register (RDRP)
Module Base + 0x001B
7
R
RDRP7
W
6
RDRP6
5
RDRP5
4
RDRP4
3
RDRP3
2
RDRP2
1
RDRP1
0
RDRP0
Reset
0
0
0
0
0
0
0
0
Figure 4-26. Port P Reduced Drive Register (RDRP)
Read: Anytime. Write: Anytime.
This register configures the drive strength of each port P output pin as either full or reduced. If the port is
used as input this bit is ignored.
Table 4-25. RDRP Field Descriptions
Field
Description
7–0
Reduced Drive Port P
RDRP[7:0] 0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
4.3.4.5 Port P Pull Device Enable Register (PERP)
Module Base + 0x001C
7
R
PERP7
W
6
PERP6
5
PERP5
4
PERP4
3
PERP3
2
PERP2
Reset
0
0
0
0
0
0
Figure 4-27. Port P Pull Device Enable Register (PERP)
Read: Anytime. Write: Anytime.
1
PERP1
0
0
PERP0
0
This register configures whether a pull-up or a pull-down device is activated, if the port is used as input.
This bit has no effect if the port is used as output. Out of reset no pull device is enabled.
Table 4-26. PERP Field Descriptions
Field
Description
7–0
Pull Device Enable Port P
PERP[7:0] 0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
MC9S12KG128 Data Sheet, Rev. 1.16
160
Freescale Semiconductor