多功能数字钟的设计51624(33页)Good is good, but better carries it.精益求精，善益求善。 目录1 绪论.........................................................................................................................11.1 概述................................................................................................................11.2 设计任务.......................................................................................................21.3 功能要求.......................................................................................................22 电路设计................................................................................................................32.1设计方案.......................................................................................................32.2单元电路的设计.........................................................................................42.2.1 主体电路部分....................................................................................42.2.1.1 振荡电路.............................................................................................42.2.1.2 计数电路.............................................................................................72.2.1.3 校时电路.........................................................................................112.2.1.4 译码与显示电路...........................................................................132.2.2 扩展功能电路的设计.................................................................142.2.2.1 定时控制电路...............................................................................142.2.2.2 仿广播电台正点报时电路........................................................162.2.2.3 自动报整点时数电路.................................................................172.2.2.4 触摸报整点时数电路.................................................................193 调试............................................................
