Description: This procedure is in front of the experimental design based on a comprehensive program. After entering the demonstration of the various effects of blinking led. PC through the disruption to receive orders. PC in order to receive, use Timer0 to the order does not guarantee the correctness, that is, to ensure that the order is a complete sentence. According to the order can be designated demonstration led blinking effect, to write a port of any 8255, 8255 any time the data port. If external interrupt, buzzer connected correctly, buzzer will sound until power-down or reset the target board.
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一个综合性的例子.doc
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