Measurement Computing CIO-DAS16/M1 - Manual (Page 27)

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Table 4-5. 82C55 Programming Codes
D4 D3 D1 D0 HEX DEC A CU B CL
0 0 0 0 80 128 OUT OUT OUT OUT
0 0 0 1 81 129 OUT OUT OUT IN
0 0 1 0 82 130 OUT OUT IN OUT
0 0 1 1 83 131 OUT OUT IN IN
0 1 0 0 88 136 OUT IN OUT OUT
0 1 0 1 89 137 OUT IN OUT IN
0 1 1 0 8A 138 OUT IN IN OUT
0 1 1 1 8B 139 OUT IN IN IN
1 0 0 0 90 144 IN OUT OUT OUT
1 0 0 1 91 145 IN OUT OUT IN
1 0 1 0 92 146 IN OUT IN OUT
1 0 1 1 93 147 IN OUT IN IN
1 1 0 0 98 152 IN IN OUT OUT
1 1 0 1 99 153 IN IN OUT IN
1 1 1 0 9A 154 IN IN IN OUT
1 1 1 1 9B 155 IN IN IN IN
Note: D7 is always 1. Bits D6, D5, and D2 are always 0.
4.6.11 COUNTER CHIP (82C 54)
The 82C54 counter chip is quite complex. The data sheet for the part contains programming information,
input and output timing diagrams and interfacing specifications.
It is beyond the scope of this manual to reproduce the information, all of which is contained in the chip
manufacturers data sheet. The data sheet can be obtained from the Intel or Harris web sites.