简单但是齐全的单片机计时，具有断电不丢失功能，接通电源继续累计时间，每天可单独计时，单独计时的人工累加，否则计满96小时自动累加-Simple but complete single chip timing, a feature not lost power, turn on the power continue to accrue time, daily time alone, time alone artificial additive, or automatically accumulat