
Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
842
Freescale Semiconductor
22.3.2.20 Port T Reduced Drive Register (RDRT)
Read: Anytime.
Write: Anytime.
This register configures the drive strength of each port T output pin as either full or reduced. If the port is
used as input this bit is ignored.
22.3.2.21 Port T Pull Device Enable Register (PERT)
Read: Anytime.
Write: Anytime.
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.
7
6
5
4
3
2
1
0
R
RDRT7
RDRT6
RDRT5
RDRT4
RDRT3
RDRT2
RDRT1
RDRT0
W
Reset
0
0
0
0
0
0
0
0
Figure 22-22. Port T Reduced Drive Register (RDRT)
Table 22-24. RDRT Field Descriptions
Field
Description
7–0
RDRT[7:0]
Reduced Drive Port T
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
7
6
5
4
3
2
1
0
R
PERT7
PERT6
PERT5
PERT4
PERT3
PERT2
PERT1
PERT0
W
Reset
0
0
0
0
0
0
0
0
Figure 22-23. Port T Pull Device Enable Register (PERT)
Table 22-25. PERT Field Descriptions
Field
Description
7–0
PERT[7:0]
Pull Device Enable Port T
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.