ＤＰ８５７３Ａ是美国国家半导体公司生产的计算机用日历时钟芯片，当主电源出现故障时自动转到备用电源并记录故障出现时间，有三种中断类型，并能记录晶振停振时间，故更适用于要求严格的工业控制和军事领域。本文对其功能及特点进行了简要介绍，并给出与８０３１单片机的接口电路和应用软件 DP8573A is a National Semiconductor clock calendar chip for computer production, when the main power failure automatically go to the standby power supply and record the failure time, there are three types of interrupts, and can record the crystal vibration stop time, it is more suitable for demanding Industrial control and military fields. This text has carried on the brief introduction to its function and the characteristic, and has given the interface circuit and the application software with 8031 ​​one-chip computer