PIC16F886单片机做的电子钟，时钟芯片为DS1302，解决了DS1302时钟芯片拔掉后配电池后只能读出而不能写入时间的问题。-PIC16F886 microcontroller to do the electronic clock, the clock chip DS1302, DS1302 clock chip solves the disconnect with the battery, only to be read later and can not write to a matt