Datasheet

Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
864 Freescale Semiconductor
22.3.2.49 Port H Reduced Drive Register (RDRH)
Read: Anytime.
Write: Anytime.
This register configures the drive strength of each Port H output pin as either full or reduced. If the port is
used as input this bit is ignored.
22.3.2.50 Port H Pull Device Enable Register (PERH)
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.
76543210
R
RDRH7 RDRH6 RDRH5 RDRH4 RDRH3 RDRH2 RDRH1 RDRH0
W
Reset 00000000
Figure 22-51. Port H Reduced Drive Register (RDRH)
Table 22-46. RDRH Field Descriptions
Field Description
7–0
RDRH[7:0]
Reduced Drive Port H
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
76543210
R
PERH7 PERH6 PERH5 PERH4 PERH3 PERH2 PERH1 PERH0
W
Reset 00000000
Figure 22-52. Port H Pull Device Enable Register (PERH)
Table 22-47. PERH Field Descriptions
Field Description
7–0
PERH[7:0]
Pull Device Enable Port H
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.