Motorola DSP56301 - Manual (Page 353)

Programming Sheets
Programming Reference B -41
Figure B-29. Port C Registers (PCRC, PRRC, PDRC)
Application: Date:
Programmer:
Sheet 2 of 4
GPIO
23 6 5 4 3 2 1 0
PCC5 PCC4 PCC3 PCC2 PCC1 PCC0
Port C Control Register (PCRC) X:$FFFFBF Read/Write
Reset = $000000
*
0
* = Reserved, Program as 0
*
0
PCn = 1
→
Port Pin configured as ESSI
PCn = 0
→
Port Pin configured as GPIO
Port C (ESSI0)
23 6 5 4 3 2 1 0
PRC5 PRC4 PRC3 PRC2 PRC1 PRC0
Port C Direction Register (PRRC) X:$FFFFBE Read/Write
Reset = $000000
*
0
*
0
PDCn = 1
→
Port Pin is Output
PDCn = 0
→
Port Pin is Input
23 6 5 4 3 2 1 0
PDC5 PDC4 PDC3 PDC2 PDC1 PDC0
Port C GPIO Data Register (PDRC) X:$FFFFBD 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