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