利用89C51单片机、DS12887时钟芯片和字符型LCD构成的设备运行时间记录仪，用于记录设备启停时间和设备累计运行时间，以此作为大型设备维护和维修的参考依据。 -Using 89C51, DS12887 and the character LCD device to design　run-time recorder, start and stop time for recording devices and equipment, total running time, as a large-scale equipment maintenance and repair of reference.