Scan button procedure, 51 single-chip key procedures

按键
....\KEY
....\KEY.hex
....\KEY.lnp
....\KEY.lst
....\KEY.M51
....\KEY.obj
....\KEY.Opt
....\KEY.plg
....\KEY.Uv2
....\KEY_Opt.Bak
....\KEY_Uv2.Bak
....\main.lst
....\main.obj
....\程序
....\....\beeper.h
....\....\KEY.c
....\....\KEY.H
....\....\main.c

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