Based on AT89C51 music countdown counter, countdown time can be achieved through the key addition and subtraction, the countdown to the time after the buzzer alarm some music while LED lights

chengxu
chengxu.hex
chengxu.lnp
chengxu.M51
chengxu.plg
chengxu.uvopt
chengxu.uvproj
chengxu_uvopt.bak
chengxu_uvproj.bak
cx.c
cx.LST
cx.OBJ
Last Loaded tu.DBK
STARTUP.A51
STARTUP.LST
STARTUP.OBJ
tu.DSN
tu.PWI

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