Based on 51 MCU 3* 4 keyboard scanning, which has the hex file

键盘扫描
........\STARTUP.A51
........\STARTUP.LST
........\STARTUP.OBJ
........\键盘扫描
........\键盘扫描.c
........\键盘扫描.hex
........\键盘扫描.lnp
........\键盘扫描.LST
........\键盘扫描.M51
........\键盘扫描.OBJ
........\键盘扫描.plg
........\键盘扫描.uvgui.韦鑫
........\键盘扫描.uvgui_韦鑫.bak
........\键盘扫描.uvopt
........\键盘扫描.uvproj
........\键盘扫描._c

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