在设计手动播放和自动播放可以选择使用的电路中，程序在下载完成后，可以实现手动播放和自动播放的按键转换，通过switch按键，当按键处于‘1’状态时。则处于自动播放音乐（两只老虎），当按键‘0’时，处于手动播放音乐。自动播放和手动播放互不干扰，但是可以通过按键进行转换，最终实现实验目的。-In circuit design manual play and auto play can choose to use the program after the download is complete, you can manually play and auto play buttons conversion, the switch button when the button is in the　1　state. Is in the auto-play music (two tigers), when the key　0　in the manual to play music. Play automatically and manually play without disturbing each other, but you can a button to convert, and ultimately the purpose of the experiment.