1.利用I/O口产生一定频率的方波，驱动蜂鸣器，发出不同的音调，从而演奏乐曲（最少三首乐曲，每首不少于30秒）

2．采用LCD显示信息

3．开机时有英文欢迎提示字符，播放时显示歌曲序号（或名称）

4．可通过功能键选择乐曲，暂停，播放。

5．选作内容：显示乐曲播放时间或剩余时间

-1. The use of I/O port must have a square-wave frequency, buzzer driver, different tones, which play music (at least 3 pieces, each not less than the first 30 seconds) 2. The use of information LCD display 3. Welcome to have boot-up prompts in English characters, the player to display song number (or name) 4. Through the music selection function keys, pause, play. 5. Selected as the content: Display the remaining time or music playback time