mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 864

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
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.
864
RDRH[7:0]
PERH[7:0]
Reset
Reset
Field
Field
7–0
7–0
W
W
R
R
RDRH7
PERH7
Reduced Drive Port H
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
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.
0
0
7
7
RDRH6
PERH6
Figure 22-52. Port H Pull Device Enable Register (PERH)
0
0
6
6
Figure 22-51. Port H Reduced Drive Register (RDRH)
Table 22-46. RDRH Field Descriptions
Table 22-47. PERH Field Descriptions
RDRH5
PERH5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
5
RDRH4
PERH4
0
0
4
4
Description
Description
RDRH3
PERH3
0
0
3
3
RDRH2
PERH2
0
0
2
2
RDRH1
PERH1
Freescale Semiconductor
0
0
1
1
RDRH0
PERH0
0
0
0
0