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DM5806 датащи(PDF) 34 Page - List of Unclassifed Manufacturers |
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DM5806 датащи(HTML) 34 Page - List of Unclassifed Manufacturers |
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34 / 64 page ![]() 4-4 BA + 3: 8255 PPI Control Word (Write Only) When bit 7 of this word is set to 1, a write programs the PPI configuration. Bit 6 must always be set to 0 (Mode 2 operation is not supported by the DM5806). The table below shows the control words for the 16 possible Mode 0 Port I/O combinations. D7 D6 D5 D4 D3 D2 D1 D0 Port C Lower 0 = output 1 = input Port B 0 = output 1 = input Mode Set Flag 1 = active Port C Upper 0 = output 1 = input Port A 0 = output 1 = input Group B Mode Select 00 = mode 0 01 = mode 1 1x = mode 2 Mode Select 0 = mode 0 1 = mode 1 1 0 XXXXXX Group A 8255 Port I/O Flow Direction and Control Words, Mode 0 Group A Group B Control Word Port A Port C Upper Port B Port C Lower Binary Decimal Hex Output Output Output Output 1 0 0 0 0 0 0 0 128 80 Output Output Output Input 1 0 0 0 0 0 0 1 129 81 Output Output Input Output 1 0 0 0 0 0 1 0 130 82 Output Output Input Input 1 0 0 0 0 0 1 1 131 83 Output Input Output Output 1 0 0 0 1 0 0 0 136 88 Output Input Output Input 1 0 0 0 1 0 0 1 137 89 Output Input Input Output 1 0 0 0 1 0 1 0 138 8A Output Input Input Input 1 0 0 0 1 0 1 1 139 8B Input Output Output Output 1 0 0 1 0 0 0 0 144 90 Input Output Output Input 1 0 0 1 0 0 0 1 145 91 Input Output Input Output 1 0 0 1 0 0 1 0 146 92 Input Output Input Input 1 0 0 1 0 0 1 1 147 93 Input Input Output Output 1 0 0 1 1 0 0 0 152 98 Input Input Output Input 1 0 0 1 1 0 0 1 153 99 Input Input Input Output 1 0 0 1 1 0 1 0 154 9A Input Input Input Input 1 0 0 1 1 0 1 1 155 9B |
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