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电子技术(上)课程设计
题目名称：电子时钟显示电路 院系名称： 班 级： 学 号： 学生姓名： 指导教师：
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摘 要
电子时钟是一种通过电子元器件控制、执行、显示的电子产品。实现了对“时”、“分”、“秒”数字显示的计时装置。具有时间显示、闹钟设置、报时功能、校正功能。走时准确、显示直观、精确、稳定等优点。电路装置十分小巧，安装使用也方便。同时在日期中，它以其小巧，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。
本电路由555振荡器、74HC74分频器、74HC4518计数器、74HC4511译码器和显示器连接而成。实现了电子时钟的基本功能。
关键词：晶体振荡器、分频器、计数器，显示器
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Abstract
Electronic clock is controlled by electronic components, perform, display of electronic products. Realize the \time display, alarm clock settings, timer function, correction. Accurate time display and intuitive, precise, stable and so on. Circuit device is very compact, easy to install and use also. At the same time in the date, with its compact, low cost, travel time and high precision, easy to use, multi-function, ease of integration and loved by the majority of consumers.
The circuit consists of 555 oscillator, 74hc74 divider, 74hc4518 counter, 74hc4511 decoder and display connection is made. To achieve the basic functions of the electronic clock.
Key words：；crystal oscillators, frequency divider, counters, display
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目 录
中文摘要 Abstract 目录
1 前言 ........................................................................................................................................... 1 2 总体方案设计 ........................................................................................................................ 1
2.1 设计目的 ...................................................................................................................... 1 2.2 设计任务 ..................................................................................................................... 1 2.3 设计要求 ..................................................................................................................... 2 2.4 原理说明 ..................................................................................................................... 2 3 单元模块设计 ........................................................................................................................ 3
3.1 结构框图 ..................................................................................................................... 3 3.2 振荡和分频电路 ........................................................................................................ 3
3.2.1 振荡电路逻辑器件 ........................................................................................ 3 3.2.2 逻辑器件——74HC74 .................................................................................. 4 3.2.3 CC4060与74HC74的连接 .......................................................................... 4 3.3 译码电路 ..................................................................................................................... 5 3.3.1 逻辑器件——74HC4518 ............................................................................. 5 3.3.2 逻辑器件——74HC4511 ............................................................................. 5 3.3.3 译码电路——74HC4518的连接 .............................................................. 6 3.4 单元电路连接电路 ................................................................................................... 6 3.4.1 计数器电路 ..................................................................................................... 6 3.4.2 译码器显示电路............................................................................................ 7 3.5 电子时钟电路原理图 ............................................................................................... 9 4 系统调试与功能 .................................................................................................................... 9
4.1 调试过程 ..................................................................................................................... 9 4.2 功能的实现 ................................................................................................................. 10 5 设计总结 .................................................................................................................................. 10
5.1 收获体会 ..................................................................................................................... 10 附录一：元器件清单 .................................................................................................................. 11
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电子时钟显示电路
