Interface Experiment 1 way programmable parallel interface 8255 Experimental circuit 1 output mode, a single pulse each time the button produces a positive pulse to 8255 to generate an interrupt request to CPU into the An interrupt service line: turn out 01H, 02H, 04H, 08H, 10H, 20H, 40H, 80H to L0 ~ L7 followed by light, interrupted 8 times over.

实验十8255方式1.doc

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