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Application:
GPIO
Port E Control Register
Port E Direction Register
Port E GPIO Data Register
Figure D-25 Port E Registers (PCRE, PRRE, PDRE)
MOTOROLA
Port E (SCI)
23
6
*
*
(PCRE)
0
0
X:$FFFF9F
ReadWrite
Reset = $0
PCn = 1 ® Port Pin configured as SCI
PCn = 0 ® Port Pin configured as GPIO
23
6
*
*
(PRRE)
0
0
X:$FFFF9E
ReadWrite
Reset = $0
PDCn = 1 ® Port Pin is Output
PDCn = 0 ® Port Pin is Input
23
6
*
*
(PDRE)
0
0
X:$FFFF9D
ReadWrite
Reset = $0
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
DSP56309UM/D
Programming Reference
Date:
Programmer:
5
4
3
2
1
*
*
*
PC2
PC1
0
0
0
5
4
3
2
1
*
*
*
PDC2
PDC1
0
0
0
5
4
3
2
1
*
*
*
PD2
PD1
0
0
0
Sheet 4 of 4
0
PC0
0
PDC0
0
PD0
D-39
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