目录摘要................................................................1绪论............................................................21.1单片机的背景.....................................................21.2单片机的意义.....................................................21.3单片机的应用.....................................................22整体设计方案.....................................................22.1单片机的选择......................................................22.2单片机的基本结构..................................................33数字钟的硬件设计................................................43.1最小系统设计.....................................................43.2LED显示电路.....................................................73.3键盘控制电路.....................................................84数字钟的软件设计...............................................84.1系统软件设计流程图................................................94.2数字电子钟的原理图...............................................124.3主程序.........................................................134.4时钟设置子程序..................................................144.5定时器中断子程序................................................144.6LED显示子程序...................................................144.7按键控制子程序..................................................165系统仿真........................................................175.1PROTUES软件介绍..................................................175.2电子钟系统PROTUES仿真............................................176调试与功能说明.................................................186.1系统时钟误差分析..................................................186.2硬盘调试.........................................................186.3软件调试问题及解决...............................................186.4总结............................................................19参考文献...........................................................20致谢...............................................................21PAGE\*MERGEFORMAT20单片机数字电子钟的设计摘要：20世纪末，电子技术获得了飞速的发展，在其推动下，现代电子