MC9S12XDP512CFU
Model | MC9S12XDP512CFU |
Description | 16-BIT, FLASH, 40MHz, MICROCONTROLLER, PQFP80 |
PDF file | Total 1348 pages (File size: 8M) |
Chip Manufacturer | PHILIPS |
Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
22.3.2.57 Port J Reduced Drive Register (RDRJ)
7
6
5
4
3
2
1
0
R
RDRJ7
W
Reset
0
0
0
0
RDRJ6
RDRJ5
RDRJ4
0
RDRJ2
0
0
RDRJ1
0
RDRJ0
0
= Unimplemented or Reserved
Figure 22-59. Port J Reduced Drive Register (RDRJ)
Read: Anytime.
Write: Anytime.
This register configures the drive strength of each port J output pin as either full or reduced. If the port is
used as input this bit is ignored.
Table 22-53. RDRJ Field Descriptions
Field
7–0
RDRJ[7:4]
RDRJ[2:0]
Description
Reduced Drive Port J
0 Full drive strength at output.
1 Associated pin drives at about 1/6 of the full drive strength.
22.3.2.58 Port J Pull Device Enable Register (PERJ)
7
6
5
4
3
2
1
0
R
PERJ7
W
Reset
1
1
1
1
PERJ6
PERJ5
PERJ4
0
PERJ2
0
1
PERJ1
1
PERJ0
1
= Unimplemented or Reserved
Figure 22-60. Port J Pull Device Enable Register (PERJ)
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 or
as wired-OR output. This bit has no effect if the port is used as push-pull output. Out of reset a pull-up
device is enabled.
Table 22-54. PERJ Field Descriptions
Field
7–0
PERJ[7:4]
PERJ[2:0]
Description
Pull Device Enable Port J
0 Pull-up or pull-down device is disabled.
1 Either a pull-up or pull-down device is enabled.
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
871