陈 姗
班 级
专 业
所 在石宗源简历 系
指导老师
梁自强
完成时间：2011年12月00日至民用机场管理条例2012年05月20日目 录
摘 要中华人民共和国监察部
艾虎生
现代生活的人们越来越重视起了时间观念，可以说是时间和金钱划上了等号。对于那些对时间把握非常严格和准确的人或事来说，时间的不准确会带来非常大的麻烦，所以以数码管为显示器的时钟比指针式的时钟表现出了很大的优势。数码管显示的时间简单明了而且读数快、时间准确显示到秒。而机械式的依赖于晶体震荡器，可能会导致误差。数字钟是采用数字电路实现对“时”、“分”、“秒”数字显示的计时装置。数字钟的精度、稳定度远远超过老式机械钟。在这次设计中，我们采用LED数码管显示时、分、秒，以24小时计时方式，根据数码管动态显示原理来进行显示，用12MHz的晶振产生振荡脉冲，定时器计数。在此次设计中，电路具有显示时间的其本功能，还可以实现对时间的调整。数字钟是其小巧，价格低廉，走时精度高，使用方便，功能多，便于集成化而受广大消费的喜爱，因此得到了广泛的使用。
本次设计数字式电子时钟的是以AT89C51单片机为控制核心，包括了硬件以及软件的设计。并通过软件仿真法实现了以24小时为一个周期并能同时显示小时、分钟和秒以及具有整点报时的功能。
关键词：单片机AT89C51, 数码管，时间显示。
Abstract
Modern life of people more and more attention to the concept of time, can be said to be the time and money is a sign. For those who hold very strict in time and accurately the person or thing, time is not accurate will bring great trouble, so digital tube display pointer clock than clock showed a great advantage. Digital tube display time is simple and fast, accurate time readings showed to the second. While mechanical dependent on crystal oscillators, may lead to error.
Digital clock is a digital circuit implementation of the" when"," sub"," the second" the figures show that the timing device. Digital clock precision, stability, far more than the old mechanical clocks. In this design, we adopt LED digital display tube when, minutes and s
econds, in 24 hours time, according to the principle of dynamic display of digital tube display is performed, using 12MHz crystal oscillation pulse, a timer counting. In this design, the circuit has the functions of time display, also can realize the adjustment of time. Digital clock is its small size, low price, high precision of travel time, convenient use, multiple functions, convenient integration and by the consumer favorite, so it has been widely used.
The design of digital electronic clock based on AT89C51 MCU as the control core, including the hardware and software design. And through software simulation method in order to realize the 24 hours for a period and can simultaneously display hours, minutes and seconds and with the whole point timekeeping function.
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