目录
一、设计目的............................................................................................1
二、系统设计............................................................................................2
（一）设计要求..................................................................................2
（二）系统设计..................................................................................3
三、 电路设计原理与仿真.......................................................................4
（一） 总体原理图.............................................................................4
（二） 主要器件的介绍.....................................................................5
1. 555 定时器.................................................................................5
2. CD4511.......................................................................................7
3. CD4518.......................................................................................9
（三） 单元电路工作原理...............................................................11
1. 振荡器的设计..........................................................................11
2. 时、分、秒显示电路模块设计..............................................12
3. 校时电路模块设计..................................................................14
4. 一键清零电路设计..................................................................15
5. 整点报时电路设计..................................................................15
（四） 数字钟的仿真.......................................................................17
1. 仿真电路图..............................................................................17
2. 仿真过程..................................................................................17
3. 仿真结果..................................................................................18
四、 电路调试及分析.............................................................................21
（一） 面包板的介绍.......................................................................21
