nterrupt mode to read the button state, LCD screen can display button control results

KEY - int
.........\KEY
.........\KEY.M51
.........\KEY.hex
.........\KEY.lnp
.........\KEY.plg
.........\KEY.uvopt
.........\KEY.uvproj
.........\KEY_uvopt.bak
.........\KEY_uvproj.bak
.........\STARTUP.A51
.........\STARTUP.LST
.........\STARTUP.OBJ
.........\lcd.LST
.........\lcd.OBJ
.........\lcd.c
.........\lcd.h
.........\main.LST
.........\main.OBJ
.........\main.c

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