毕业设计（论文）基于单片机的电子时钟32725721.doc

题目：基于单片机的 电子表设计 系 （部）：自动化系 专 业 班：机电0601班 姓 名： 学 号： 指导教师：雷丹 2009年5月日  基于单片机的电子表设计 Based on the design of e-SCM 摘 要 基于AT89C51单片机的电子表设计。现今，高精度的计时工具大多数都使用了石英晶体振荡器，由于电子时钟采用了石英技术，因此走时精度高，稳定性好，使用方便，不需要经常调校，数字式电子时钟用集成电路计时，译码代替机械式传动，用LED显示器代替指针显示进而显示时间，减小了计时误差，这种表具有时，分，秒显示时间的功能，还可以进行时和分的校对，片选的灵活性好。电子时钟广泛应用于个人家庭，车站，码头办公室等公共场所，成为人们常生活中不可缺少的必需品。电子时钟给人们的生活带来极大的方便，而且大大扩展了钟表原先的功能。诸如定时自动报警，定时开关，自动起闭电路等等。在一定程度上让单片机的涉及范围得以体现，从而扩大应用领域。因此研究电子时钟及扩大其应用，在一定程度上有很大的现实意义。 关键词：电子表??? AT89C51??? 共阴极LED数码显示器  Abstract Today, the majority of high-precision timing tools are used quartz crystal oscillator, as a result of the use of electronic quartz clock technology, travel time and high precision, good stability, easy to use, does not require frequent calibration, digital electronic clock with integrated circuits time, the decoder in place of mechanical transmission, used in place of the display instead of LED displays to show the target time, reduce the time error, this table has the hours, minutes and seconds time display function, can also be used for proof-reading time and points , the flexibility of a good chip. Electronic clock is widely used in personal family, stations, terminals and other public office Places, people often become an essential life necessities. Electronic clock to peoples lives bring great convenience, but also greatly expanded the functions of the original clocks. Such as regular auto-alarm, timer switch, automatic starting circuit and so closed. To some extent, so that covers a single chip is embodied so as to extend the application areas. The study of electronic clocks and to expand its application, to a certain extent there is a great practical significance. Key words: Electronic Table??? AT89C51??? Total cathode LED figures display???  目 录 摘要…………………………………………………………………………………I Abstract………………………………………………………………………………II 目录…………………………………………………………………………………Ⅲ 绪论…………………………………………………………………………………1 第一章 单