综合微机通用总线、定时计数器、并行接口、中断控制器等芯片等控制原理，设计电路及控制程序，实现定时I/O、可根据8位开关输入信号,选择多首歌曲中某一首歌,控制扬声器播放歌曲，并在播放每一音频时，采用8位发光二极管显示该音顺序号。串行-integrated computer Universal Bus, regular counter, parallel interface, interrupt controller chip, such as the principle of control, Circuit design and control procedures, regular I / O, according to eight switches the input signal, the first choice of many songs a song, control of loudspeakers to broadcast songs, and in every broadcast audio, using eight LEDs indicates the tone of the order. Serial