DS12887为DALLAS公司生产的实时时钟芯片，除具有实时钟功能外，它还具有114字节的通用RAM。内藏锂电池，并与广泛应用的DS1287、MC146818B脚对脚兼容。本文从应用角度出发，概述了其功能特点、外部特性、内部结构及与微机芯片的接口应用。-DALLAS produced for the DS12887 Real Time Clock chip, in addition to real-time clock functions, it also has 114 bytes of general-purpose RAM. Containing lithium batteries, widely used with the DS1287, MC146818B pin compatible to the feet. This article from the application point of view, provides an overview of its features, external features, internal structure and the interface with the application of computer chips.