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Table 5-3. DIO Port Configurations/Per Group
Programming Codes
D4
D3
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
Notes: 'CU' is PORT C upper nibble, 'CL' is PORT C lower nibble.
5.4.2 Group 1 8255 Configuration & Data
GROUP 1, PORT A DATA
BADR3 + 4
READ/WRITE
7
6
D7
D6
GROUP 1, PORT B DATA
BADR3 + 5
READ/WRITE
7
6
D7
D6
GROUP 1, PORT C DATA
BADR3 + 6
READ/WRITE
7
6
C8
C7
CH4
CH3
D1
D0
Hex
0
0
80
0
1
81
1
0
82
1
1
83
0
0
88
0
1
89
1
0
8A
1
1
8B
0
0
90
0
1
91
1
0
92
1
1
93
0
0
98
0
1
99
1
0
9A
1
1
9B
5
4
D5
D4
5
4
D5
D4
5
4
C6
C5
CH2
CH1
Dec
A
128
OUT
129
OUT
130
OUT
131
OUT
136
OUT
137
OUT
138
OUT
139
OUT
144
IN
145
IN
146
IN
147
IN
152
IN
153
IN
154
IN
155
IN
3
2
D3
D2
3
2
D3
D2
3
2
C4
C3
CL4
CL3
13
Values
B
CU
CL
OUT
OUT
OUT
OUT
OUT
IN
IN
OUT
OUT
IN
OUT
IN
OUT
IN
OUT
OUT
IN
IN
IN
IN
OUT
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
IN
IN
OUT
OUT
IN
OUT
IN
OUT
IN
OUT
OUT
IN
IN
IN
IN
OUT
IN
IN
IN
1
D1
D0
1
0
D1
D0
1
0
C2
C1
CL2
CL1
0
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