51单片机+DS1302实现的数码管电子钟，有日历、闹钟、秒表（可分圈计时）功能，若使用带EEPROM的STC51单片机还可记忆闹钟状态，掉电时闹钟时间和开关状态不会重新初始化，比较实用，附Proteus仿真-51 MCU+ DS1302 to achieve digital tube digital clock, calendar, alarm clock, stopwatch function (can be divided into the lap times), if STC51 SCM