8255A A-port as output, connect 8 LED lights. 8255A, B port as input, connecting eight buttons. When the B port of a button is pressed, the corresponding LED lights will light up simultaneously. Meanwhile, the digital tube display the corresponding key number. If port B button 1 Press, the 1st LED lights will illuminate and an 8-segment LED display.

20121885杨丹
20121885杨丹.doc
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