Chapter 4 Port Integration Module (S12XDP512PIMV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
254 Freescale Semiconductor
4.3.2.64 Port AD0 Reduced Drive Register 1 (RDR1AD0)
Read: Anytime.
Write: Anytime.
This register configures the drive strength of each output pin PAD[07:00] as either full or reduced. If the
port is used as input this bit is ignored.
4.3.2.65 Port AD0 Pull Up Enable Register 1 (PER1AD0)
Read: Anytime.
Write: Anytime.
This register activates a pull-up device on the respective pin PAD[07:00] 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.
0x0275
76543210
R
RDR1AD07 RDR1AD06 RDR1AD05 RDR1AD04 RDR1AD03 RDR1AD02 RDR1AD01 RDR1AD00
W
Reset 00000000
Figure 4-66. Port AD0 Reduced Drive Register 1 (RDR1AD0)
Table 4-59. RDR1AD0 Field Descriptions
Field Description
7–0
RDR1AD0[7:0]
Reduced Drive Port AD0 Register 1
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
0x0277
76543210
R
PER1AD07 PER1AD06 PER1AD05 PER1AD04 PER1AD03 PER1AD02 PER1AD01 PER1AD00
W
Reset 00000000
Figure 4-67. Port AD0 Pull Up Enable Register 1 (PER1AD0)
Table 4-60. PER1AD0 Field Descriptions
Field Description
7–0
PER1AD0[7:0]
Pull Device Enable Port AD0 Register 1
0 Pull-up device is disabled.
1 Pull-up device is enabled.