Keys based on 51 single-chip program, interrupt mode, the query and 4*4 keyboard, only for school exchanges.

3-按键\1、无消抖处理的按键程序\ex69
......\.......................\ex69.c
......\.......................\ex69.hex
......\.......................\ex69.lnp
......\.......................\ex69.LST
......\.......................\ex69.M51
......\.......................\ex69.OBJ
......\.......................\ex69.opt.bak
......\.......................\ex69.plg
......\.......................\ex69.Uv2.bak
......\.......................\ex69.uvgui.Administrator
......\.......................\ex69.uvgui_Administrator.bak
......\.......................\ex69.uvopt
......\.......................\ex69.uvproj
......\.......................\ex69_Opt.Bak
......\.......................\ex69_Uv2.Bak
......\2、消抖处理的按键程序\ex70
......\.....................\ex70.c
......\.....................\ex70.hex
......\.....................\ex70.lnp
......\.....................\ex70.LST
......\.....................\ex70.M51
......\.....................\ex70.OBJ
......\.....................\ex70.opt.bak
......\.....................\ex70.plg
......\.....................\ex70.Uv2.bak
......\.....................\ex70.uvgui.Administrator
......\.....................\ex70.uvgui_Administrator.bak
......\.....................\ex70.uvopt
......\.....................\ex70.uvproj
......\.....................\ex70_Opt.Bak
......\.....................\ex70_Uv2.Bak
......\3、按键外部中断\ex3
......\...............\ex3.c
......\...............\ex3.hex
......\...............\ex3.lnp
......\...............\ex3.LST
......\...............\ex3.M51
......\...............\ex3.OBJ
......\...............\ex3.opt.bak
......\...............\ex3.plg
......\...............\ex3.Uv2.bak
......\...............\ex3.uvgui.Administrator
......\...............\ex3.uvgui_Administrator.bak
......\...............\ex3.uvopt
......\...............\ex3.uvproj
......\...............\ex3_Uv2.Bak
......\4、矩阵键盘\ex3
......\...........\ex3.c
......\...........\ex3.hex
......\...........\ex3.lnp
......\...........\ex3.LST
......\...........\ex3.M51
......\...........\ex3.OBJ
......\...........\ex3.opt.bak
......\...........\ex3.plg
......\...........\ex3.Uv2.bak
......\...........\ex3.uvgui.Administrator
......\...........\ex3.uvgui_Administrator.bak
......\...........\ex3.uvopt
......\...........\ex3.uvproj
......\...........\ex3_Uv2.Bak
......\51LED灯.DSN
......\51LED灯.PWI
......\Last Loaded 51LED灯.DBK
......\1、无消抖处理的按键程序
......\2、消抖处理的按键程序
......\3、按键外部中断
......\4、矩阵键盘
3-按键

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