Description: The program directly using the time-scan method, the board design 5 buttons, respectively, then the P13-P17 pin, trigger keys way to pick 0 (that is the key to another pin GND)
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例7-键盘程序\lhj
............\lhj.hex
............\lhj.lnp
............\lhj.Opt
............\lhj.plg
............\lhj.Uv2
............\lhj_Opt.Bak
............\lhj_Uv2.Bak
............\l_key.c
............\l_key.OBJ
例7-键盘程序