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Application:
GPIO
PCn = 1
PCn = 0
23
6
*
*
0
0
Port E Control Register (PCRE)
Reset = $000000
PDCn = 1
PDCn = 0
23
6
*
*
0
0
Port E Direction Register (PRRE)
Reset = $000000
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
23
6
*
*
0
0
Port E GPIO Data Register (PDRE)
Reset = $000000
Figure B-26. Port E Registers (PCRE, PRRE, PDRE)
Port E (SCI)
Port Pin configured as ESSI
Port Pin configured as GPIO
5
4
3
2
1
*
*
*
PCE2
PCE1
0
0
0
Port Pin is Output
Port Pin is Input
5
4
3
2
1
*
*
*
PRE2
PRE1
0
0
0
5
4
3
2
1
*
*
*
PDE2
PDE1
0
0
0
Programming Reference
Date:
Programmer:
0
PCE0
X:$FFFF9F Read/Write
0
PRE0
X:$FFFF9E Read/Write
0
PDE0
X:$FFFF9D Read/Write
*
= Reserved, Program as 0
Programming Sheets
Sheet 4 of 4
B-37
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