毕业设计-基于AT89C51单片机的电子时钟.doc

摘 要 本设计主要设计了一个基于AT89C51单片机的电子时钟。并在数码管上显示相应的时间。并通过一个控制键用来实现时间的调节和是否进入省电模式的转换。应用Proteus的ISIS软件实现了单片机电子时钟系统的设计与仿真。该方法仿真效果真实、准确，节省了硬件资源。同时单片机以AT89C51为核心元件采用LED数码管显示器动态显示“时”，“分”，“秒”的现代计时装置。与传统机械表相比，它具有走时精确,显示直观等特点。另外具有校时功能，秒表功能，和定时器功能，利用单片机实现的数字时钟具有编程灵活，便于功能的扩充等优点。 关键词：数字钟系统； 单片机； LED液晶显示器 Digital clock system Abstract The system uses MCU with time, the school features such as the digital clock, SCM AT89C51 is also used as the core components of the LED digital display dynamic display when and points and seconds of the modern time device . Compared with the traditional mechanical watches, it has a precise path that intuitive, and other characteristics. In addition a school function, stopwatch function, and the timer function to achieve MCU use of the digital clock with programming flexibility to facilitate the expansion of functional advantages.  Key words: digital clock system; SCM; LED LCD Monitor 目 录 绪论...............................................................1 1.系统方案........................................................2 1.1 系统概述.......................................................2 1.2 方案论证.......................................................2 1.3扩展功能.......................................................3 1.4原理...........................................................3 1.5所需元器件...................................................3 2.电子时钟..........................................................3 2.1 电子时钟简介..................................................3 2.2电子时钟的基本特点.............................................3 2.3 电子时钟的原理.............................................4 3.单片机的相关知识................................................4 3.1单片机简介.............................................4 3.2 单片机的特点..................................................4 3.3 89C51单片机介绍..............................................4 4.单元电路设计、原理及器件选择...................................5 5．电路与程序设计...............................................13 5.1 电路设