knowledge points : understanding the structure familiar to the casual result of running the program : by P3.2 or 3.3 (low four of arbitrary one keyboard), a digital tube until 9 plus one cycle beginning to show 0 P3 sent OFH judge has the keys were not repeated cycle, an increase by R0, so as to 10 were cleared, Finally, according to the value of R0 casual switch.

Packet : 31767666anjianjishuqi.rar filelist
按键计数器.doc

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