mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 870

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

Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
22.3.2.56 Port J Data Direction Register (DDRJ)
Read: Anytime.
Write: Anytime.
This register configures each port J pin as either input or output.
The CAN forces the I/O state to be an output on PJ7 (TXCAN4) and an input on pin PJ6 (RXCAN4). The
IIC takes control of the I/O if enabled. In these cases the data direction bits will not change.
The SCI2 forces the I/O state to be an output for each port line associated with an enabled output (TXD2).
It also forces the I/O state to be an input for each port line associated with an enabled input (RXD2). In
these cases the data direction bits will not change.
The DDRJ bits revert to controlling the I/O direction of a pin when the associated peripheral module is
disabled.
870
DDRJ[7:4]
DDRJ[2:0]
Reset
Field
7–0
W
R
DDRJ7
Data Direction Port J
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Note: Due to internal synchronization circuits, it can take up to 2 bus clock cycles until the correct value is read
0
7
on PTJ or PTIJ registers, when changing the DDRJ register.
= Unimplemented or Reserved
DDRJ6
0
6
Figure 22-58. Port J Data Direction Register (DDRJ)
Table 22-52. DDRJ Field Descriptions
DDRJ5
MC9S12XDP512 Data Sheet, Rev. 2.17
0
5
DDRJ4
0
4
Description
0
0
3
DDRJ2
0
2
DDRJ1
Freescale Semiconductor
0
1
DDRJ0
0
0