基于51单片机，利用EEPROM存储的一个数字钟程序，掉电不丢失数据。源程序一编译通过，可以直接使用。希望对入门者有用-Based on 51 single-chip, EEPROM memory using a digital clock procedures, brown-out does not lose data. First compile the source code is passed, can be used directly. Hope useful for beginner