六位显示数字中系统设计.docVIP

课程设计说明书 题目： 六位显示数字中系统设计 成 绩： 时间： 2013 年 5 月 30 日至 2013 年 6 月 1 日  摘要 数字钟是现代计时器，也可用作时间控制的时钟源。数字钟具有走时准，显示直观，款式新颖，附加功能多等优点深受大家喜欢。设计一个可以走时的数字钟。由于数字集成电路的发展和广泛应用，使得数字钟的精度远远超过老式钟表，钟表的数字化给人们生产生活带来了极大方便，而且大大扩展了钟表原来的功能。如自动报时，定时广播等，所有这些都是以钟表数字化为基础的。因此研究数字钟及扩大其应用，有着非常现实的积极意义。 数字钟是一种用数字电路实现时，分，秒的计时装置，与机械式时钟更具有准确性和直观性，且无机械装置，具有更长的使用寿命，因此得到广泛使用。数字钟从原理上讲是一种典型的数字电路，其中包含了组合逻辑电路。因此，我们这次设计与制作数字钟，就是为了了解数字钟的原理，从而学会制作数字钟。而且通过数字钟的制作进一步了解各种在制作中用到的中小规模的集成电路的作用及其使用方法。且由于数字钟包括组合逻辑电路，通过它进一步学习与掌握组合逻辑电路的原理和使用方法，学会运用仿真软件proteus等。用CC4518双四位BCD同步加计数设计60进制，24进制计数器以实现60秒，60分，24小时归零的计数电路。CD4518为双位计数器，所以每个计数器分为十位和个位两部分，当秒计数到60是向分计数器进位同时秒计数器清零，分计数器向时计数器进位工作原理同分计数器，当时计数器计数到24时归零。利用CD4511七段译码驱动及共阴极数码管使电路得以显示。 关键词：CD4518 CD4511 数字钟 proteus Abstract Digital clock is the timer control, can also be used as a time clock source. Digital clock has left, intuitive display, novel style, additional features many advantages by everyone likes. The design of a digital clock can go. Due to the development of digital integrated circuits and widely used, making digital clock accuracy far more than the old clock, digital clocks to the production and life of the people has brought great convenience, but also greatly expanded the clock and watch the original function. Such as automatic timing, timing broadcast, all of these are based on digital watches. Therefore the research of digital clock and expands its application, has a positive meaning very realistic. Digital clock is a digital circuit implementation, points, a timing device of seconds, and the mechanical clock has more accuracy and intuitive, and no mechanical devices, has a longer service life, so it has been widely used. Digital clock from the principle of speaking is a typical digital circuit, which includes the combinational logic circuit. Therefore, we design and manufacture of digital clock, is to understand the principle of the digital clock, in order to learn to produce a digital clock. And throug