以51单片机为核心，外接24c04，每次上电就从24c04中读取计数初值，当计数到10的倍数，就保存到24c04中。-To 51 SCM as the core, external 24 c04, on each time electricity from 24 c04 reads the count initial value, when the count to 10 times, he keeps to 24 c04.