CSM9S12XDT512SLK Freescale Semiconductor, CSM9S12XDT512SLK Datasheet - Page 868
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CSM9S12XDT512SLK
Manufacturer Part Number
CSM9S12XDT512SLK
Description
KIT STUDENT LEARNING 16BIT
Manufacturer
Freescale Semiconductor
Datasheet
1.MC9S12XD64CAA.pdf
(1348 pages)
Specifications of CSM9S12XDT512SLK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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. 2.21
0
5
DDRJ4
0
4
Description
0
0
3
DDRJ2
0
2
DDRJ1
Freescale Semiconductor
0
1
DDRJ0
0
0
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