Port C Direction Register (Prrc) - Motorola DSP56367 User Manual

Enhanced Serial Audio Interface (ESAI)
GPIO - Pins and Registers
10.5.2

PORT C DIRECTION REGISTER (PRRC)

The read/write 24-bit Port C Direction Register (PRRC) in conjunction with the Port C
Control Register (PCRC) controls the functionality of the ESAI GPIO pins. Table 10-12
describes the port pin configurations. Hardware and software reset clear all PRRC bits.
Table 10-12 PCRC and PRRC Bits Functionality
11
X:$FFFFBF PC11
23
11 10
X:$FFFFBE PDC11 PDC10
23 22
10-54
PDC[i] PC[i]
0 0
0 1
1 0
1 1
10 9 8 7
PC10 PC9 PC8 PC7
22 21 20 19
Reserved bit - read as zero; should be written with zero for future compatibility.
Figure 10-19 PCRC Register
9 8 7
PDC9 PDC8 PDC7
21 20 19
Reserved bit - read as zero; should be written with zero for future compatibility.
Figure 10-20 PRRC Register
DSP56367
Port Pin[i] Function
disconnected
GPIO input
GPIO output
ESAI
6 5 4 3
PC6 PC5 PC4 PC3
18 17 16 15
6 5 4
PDC6 PDC5 PDC4 PDC3
18 17 16 15
2 1 0
PC2 PC1 PC0
14 13 12
3 2 1 0
PDC2 PDC1 PDC0
14 13 12
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