The use of 51 single-chip built-in timer, control I/O output, duty cycle of different waveforms, so that the buzzer has a different frequency of vibration, to achieve the singing

5、利用定时器和蜂鸣器唱歌\MAIN
.........................\MAIN.ASM
.........................\MAIN.BIN
.........................\MAIN.HEX
.........................\MAIN.LST
.........................\MAIN.M51
.........................\MAIN.OBJ
.........................\TEMP.LST
.........................\WAVE.LIN
5、利用定时器和蜂鸣器唱歌

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