Pins and internal register function of real time clock DS14287made in DALLAS are introduced in this article. Together with the hardware circuitdiagramof real time clock in the queue system,the usage and program method of DS14287are introduced in detail.

• 介绍了DALLAS公司的实时时钟芯片DS14287的引脚功能及片内寄存器 ,并结合该时钟芯片在排队机系统中的硬件电路 ,详细说明了DS14287的电路设计及编程方法。