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P1DR—Port 1 Data Register
Bit
Initial value
Read/Write
R/W
P2DR—Port 2 Data Register
Bit
Initial value
Read/Write
R/W
P3DDR—Port 3 Data Direction Register
Bit
P3 DDR
Initial value
Read/Write
638
7
6
P1
P1
7
6
0
0
R/W
7
6
P2
P2
7
6
0
0
R/W
7
6
P3 DDR
P3 DDR
7
6
0
0
W
W
5
4
P1
P1
5
4
0
0
R/W
R/W
Data for port 1 pins
5
4
P2
P2
5
4
0
0
R/W
R/W
Data for port 2 pins
5
4
P3 DDR
P3 DDR
5
4
0
0
W
W
Port 3 input/output select
0 Generic input pin
1 Generic output pin
H'C2
3
2
P1
P1
3
2
0
0
R/W
R/W
H'C3
3
2
P2
P2
3
2
0
0
R/W
R/W
H'C4
3
2
P3 DDR
P3 DDR
3
2
0
0
W
W
Port 1
1
0
P1
P1
1
0
0
0
R/W
R/W
Port 2
1
0
P2
P2
1
0
0
0
R/W
R/W
Port 3
1
0
P3 DDR
1
0
0
0
W
W
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