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 ······························ 1 1
七．附录 ································· 1 1
1.工具及器件清单 ························· 1 1
2 各元件的引脚图及功能表 ················· 1 3
3 总电路逻辑图 ··························· 1 5
（包含附加电路的总电路图附加在报告最后）
