目录 1.前言 ······································································································· 2 2 总体方案设计 ··························································································· 3 2.1 方案论证与比较 ··········································································································· 3 2.2 方案的选择 ··············································································································· 5 3 单元模块设计 ··························································································· 6 3.1 各单元模块功能介绍及电路设计 ······················································································ 6 3.1.1 秒脉冲发生器 ········································································································ 6 3.1.2 定时器 ················································································································· 6 3.1.3 控制器 ······················································································...
