电子技术课程设计数字时钟

成都理工大学工程技术学院电子技术课程设计

设计题目：数字电子钟的设计

院系：自动化工程系

专业：建筑电气与智能化

班级：2013建电1班

学号：

姓名：

指导老师：

完成时间：2015年1月19日

目录

目录 (1)

摘要 (2)

Abstract (3)

第1章电子钟的概述 (4)

1.1数字电子钟的背景 (4)

1.2数字时钟的发展历史 (4)

1.3可实现方案 (6)

1.4 本实验采用的方案 (6)

第2章系统硬件设计 (7)

2.1 系统硬件的组成 (7)

2.2 脉冲单元 (7)

2.3 74LS90N的介绍 (7)

2.4 显示器 (9)

2.5 实验室电路接线图 (10)

第3章系统软件设计与仿真 (11)

3.1 Multisim软件的简介 (11)

3.2时位计时电路 (13)

3.3 秒位计时电路 (14)

3.4分位计时电路 (15)

3.5 总计时电路 (15)

总结 (17)

参考文献 (19)

摘要

数字钟是工作生活中常用的电器，它为我们生活带来了许多方便。它是一种用数字电路技术实现时、分、秒计时的装置，与机械式时钟相比具有更高的准确性和直观性，且无机械装置，具有更长的使用寿命，已得到广泛的使用。我们所研究的电子级数钟是生活中最典型的一个代表，其最基本的功能是能过准确地显示时、分、秒时间信息。其主要构成部件有显示器、译码器、计数器、振荡器和分频器。数字钟完整地显示时、分、秒信息需要6个数码管，要分别实现时、分、秒的计时需要1个二十四进制计数器和两个六十进制计数器，要实现校时功能，需要分别针对时、分、秒的校时电路，要实现1Hz的秒钟计数需要时钟振荡电路，所以数字钟电路一般由数码显示器、六进制和二十四进制计数器、时钟振荡器和校时电路等几个部分组成。

分、秒计数需要的六十进制计数器可由十进制和六进制的计数器串联而成，小时计数需要的二十四进制计数器也可以由两个十进制计数器串联加上必要的反馈置零电路设计完成，1Hz的始终信号可以由晶体振荡器分频后提供，也可以由555定时来产生脉冲并分频为1Hz后提供。

关键字：数字电子时钟；74LS90N数码管；振荡器

Abstract

Digital clock is commonly used in working life of electric equipment, it brought a lot of convenience to our life. It is a kind of when using a digital circuit technology, minutes and seconds timing device, has higher accuracy compared with the mechanical clock and intuitive, and no mechanical device, has a longer service life, has been widely used. We studied the electronic clock series is one of the most typical representative, its most basic function is to accurately display, minutes and seconds time information. The main components are the display, decoder, counter, oscillator and a frequency divider. Digital clock, minutes and seconds when fully display information need 6 digital tube, to respectively, minutes and seconds of time need a 24 hexadecimal counter and six two decimal counter, in order to realize the school when the function, the need for hours, minutes, seconds, respectively, the school when the circuit, in order to achieve the 1 Hz need seconds count clock oscillation circuit, therefore, generally speaking, digital display digital clock circuit, six hexadecimal and 24 a binary counter, clock oscillator and the school when the circuit components.

Minutes and seconds count to 6 decimal counter can be made of a decimal and six hexadecimal counter series, and need 24 hours count hexadecimal counter can also be made up of two decimal counter in series with the necessary feedback reset circuit design is completed, 1 Hz always signal can be provided by the crystal oscillator frequency division after, can also be produced by 555 timer to provide after pulse and frequency of 1 Hz.

Key words: digital electronic clock;74 ls90n digital tube;oscillator.