说明：  单片机系统开发实例，包括对液晶面板的操作，时钟模块，闹钟模块，蜂鸣器音乐播放模块，以及键盘对液晶面板的控制。内有较详细的注释。
(Examples of single-chip microcomputer system development, including the operation of LCD panel, the clock module, alarm module, buzzer music player module, as well as the keyboard on the LCD control panel. There are more detailed notes.)