8255 uses 64 input expansion interface circuit

  
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Computer control system, you can detect the signal path switching means dressing a lot, you need a lot of input interface expansion Wei, so can all switch signal input into the
8255 uses 64 input expansion interface circuit - schematic

computer. When using a programmable chip 8255 expansion input interface, there are 8255 per piece 3 1/0, pass through the program in its entirety is initialized to enter work, you can enter up to 24 digital signals, therefore, according to the switching signal input large ones it can calculate the required number of 8255 chips. Figure 27-29 shows using 8255 expansion interface circuit 64 inputs.




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