文档介绍：摘要
单片机自20世纪70年代问世以来,以其极高的性能价格比,受到人们的重视和关注,应用很广、发展很快。单片机体积小、重量轻、抗干扰能力强、环境要求不高、价格低廉、可靠性高、灵活性好、开发较为容易。由于具有上述优点,在我国,单片机已广泛地应用在工业自动化控制、自动检测、智能仪器仪表、家用电器、电力电子、机电一体化设备等各个方面,而51单片机是各单片机中最为典型和最有代表性的一种。而现在科技越来越发达,竞争越来越激烈,运用时间越来越精密,电子时钟的设计成为现在社会的一大热门。
数字时钟是现代社会应用广泛的计时工具,在航天、电子等科研单位,工厂、医院、学校等企事业单位,各种体育赛事及至我们每个人的日常生活中都发挥着重要的作用。
这次毕业设计通过对它的学****应用,以AT89C52芯片为核心,辅以必要的电路,设计了一个简易的电子时钟,它通过数码管能够准确显本设计为单片机为主设计的电子时钟设计,它由4按键输入电路,时钟电路,蜂鸣电路,复位电路,单片机,LED显示器段码驱动电路,4位LED显示电路所组成。
软件上采用了单片机汇编源程序,主要编写了主程序;中断入口程序;1s计时程序;闪烁调时程序/秒表功能程序;;加1子程序;分、时减1程序;清0程序;显示程序;时钟时间调整程序;延时程序;闹铃时间设定调整程序等。
关键词: LED数码;AT89C52;中断
ABSTRACT
Single-chip 70 since the 20th century era of its inception, its high cost performance, attention and concern the application of a wide range of rapid development. Single-chip small size, light weight, anti-interference ability, environmental modest low cost, high reliability, flexibility, and to develop more easily. Due to these advantages, in our country, single-chip has been widely used in industrial automation control, automatic detection, intelligent instruments and meters, household appliances, power electronics, electrical and mechanical equipment in all aspects of integration, while 51 is a monolithic single-chip machines and the most typical one of the most representative. But now more and more advanced technology, petitive, more and more sophisticated use of time, the design of the electronic clock is a munity. 
Digital Clock is a modern society of the time a tool widely used in aerospace, electronics and other research institutes, factories, hospitals, schools and other institutions, all kinds of sporting events up to the daily lives of each one of us are playing an important role. 
The graduation project through its study and applications to AT89C52 chip as the core, supplemented by the necessary circuit, design a simple electronic clock, which by the DC power supply, by digital control can be accurately marked for the single-chip design Design of machine-based design