Port E Direction Register (Prre) - Motorola DSP56367 User Manual

11.5.2

PORT E DIRECTION REGISTER (PRRE)

The read/write 24-bit Port E Direction Register (PRRE) in conjunction with the Port E
Control Register (PCRE) controls the functionality of the ESAI_1 GPIO pins. Table 11-4
describes the port pin configurations. Hardware and software reset clear all PRRE bits.
Table 11-4 PCRE and PRRE Bits Functionality
11
Y:$FFFF9F PE11
23
11
Y:$FFFF9E PDE11 PDE10
23
MOTOROLA
PDE[i] PE[i]
0 0
0 1
1 0
1 1
10 9 8 7
PE10 PE9 PE8 PE7
22 21 20 19
Reserved bit - read as zero; should be written with zero for future compatibility.
Figure 11-15 PCRE Register
10 9 8 7
PDE9 PDE8 PDE7
22 21 20 19
Reserved bit - read as zero; should be written with zero for future compatibility.
Figure 11-16 PRRE Register
DSP56367
Enhanced Serial Audio Interface 1 (ESAI_1)
GPIO - Pins and Registers
Port Pin[i] Function
disconnected
GPIO input
GPIO output
ESAI_1
6 5 4 3
PE6 PE4 PE3
18 17 16 15
6 5 4 3
PDE6 PDE4 PDE3
18 17 16 15
2 1 0
PE1 PE0
14 13 12
2 1 0
PDE1 PDE0
14 13 12
11-17