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摘 要
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文中设计了一个显时、调时、定时以及具体到点报时功能的报警系统。
This paper designs a show, adjustable, timing and the specific time function of the alarm system tables.

报警系统使用12MHz晶振与AT89C51单片机相连接，通过软件编程的方法实现了以24小时为一个周期，同时显示小时、分钟和秒钟的要求。
Alarm systems use crystals 12MHz connected with AT89C51, through programming method, it is possible for a cycle in 24 hours, also shows that hour, minutes and seconds requirements.

而且有四组定时报警功能。
And there are four groups regular alarm function.

在定时时间到时有蜂鸣报警和闪光灯闪烁。
In timing time there will be a buzz alarm and flash shine.

该定时报警设有六个按键，使之具备了校时、定时功能。
The regular alarm has six buttons, make have reset, timing function.

本论文从51定时报警系统的功能，硬件电路设计，软件设计和51单片机简单介绍四部分分别论述这一系统。
This paper from 51 regular alarm system function, hardware circuit design, software design and 51 SCM introduces four parts discussed this system.

本系统51定时报警硬件部分结构简单、成本低。
This system 51 regular alarm hardware simple structure, low cost.

现代的快节奏生活给人们的精神上带来了压力，如何在工作上、生活上缓解或排解这些压力已经成为很多人和探索者多年来的一个重要研究项目，定时报警系统正是应此而生。
Modern fast rhythm to people's spiritual life pressure at work, and how to resolve these life ease or pressure has become a lot of people and one of the important explorer for many years research project, regular alarm system is born. Should this

关键词：定时报警，AT89C51，晶振
Keywords: regular alarm, AT89C51, crystals

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