一．实验内容简介 ····························3
二．实验要求 ································3
三．实验原理 ································4
四．单元电路设计及其电路图 ··················4
1.秒信号发生器 ·····························4
2.计时电路 ·································5
3.清零电路··································7
4.校分电路 ································7
5.报时电路·································8
五．附加功能：起停原理及电路图·············10
六．实验感想 ······························11
七．附录 ·································11
1.工具及器件清单 ·························11
2 各元件的引脚图及功能表 ·················13
3 总电路逻辑图 ···························15
（包含附加电路的总电路图附加在报告最后）
八．参考文献 ·····························15
一．实验内容
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