Motorola DSP56301 - Manual (Page 354)

Programming Sheets
B -42 DSP56301 User’s Manual
Figure B-30. Port D Registers (PCRD, PRRD, PDRD)
Application: Date:
Programmer:
Sheet 3 of 4
GPIO
Port D (ESSI1)
23 6 5 4 3 2 1 0
PCD5 PCD4 PCD3 PCD2 PCD1 PCD0
Port D Control Register (PCRD) X:$FFFFAF Read/Write
Reset = $000000
*
0
*
0
PCn = 1
→
Port Pin configured as ESSI
PCn = 0
→
Port Pin configured as GPIO
23 6 5 4 3 2 1 0
PRD5 PRD4 PRD3 PRD2 PRD1 PRD0
Port D Direction Register (PRRD) X:$FFFFAE Read/Write
Reset = $000000
*
0
*
0
PDCn = 1
→
Port Pin is Output
PDCn = 0
→
Port Pin is Input
23 6 5 4 3 2 1 0
PDD5 PDD4 PDD3 PDD2 PDD1 PDD0
Port D GPIO Data Register (PDRD) X:$FFFFAD Read/Write
Reset = $000000
*
0
*
0
if port pin n is GPIO input, then PDn reflects the
value on port pin n
if port pin n is GPIO output, then value written to
PDn is reflected on port pin n
* = Reserved, Program as 0