电子线路综合设计-第六组

华 南 农 业 大 学

电子线路综合设计

数字电子钟设计

班级： 组别：6

指导教师：

2015年6 月10日

摘 要

电子数字钟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，因此得到了广泛的使用。电子数字钟从原理上讲是一种典型的数字电路，其中包括了组合逻辑电路和时序电路。通过电子数字钟的制作能进一步的了解各种在制作中用到的中小规模集成电路的作用及使用方法，通过它可以进一步学习与掌握各种组合逻辑电路与时序电路的原理与使用方法。

电子数字钟的设计主要是利用74LS90的技术功能来实现电子钟时分秒的跳变，整个

设计主要分为六个模块：时模块、分模块、秒模块、信号产生及分频模块、校正模块。整点报时模块。其中信号的产生及分频是由晶振加分频器CD4060完成，而校正部分则通过加入SR触发器实现去抖功能。

关键词：CD4511 74LS90 SR触发器 晶体振荡器 校正电路

Digital Electronic Clock

Lin Zifei

(College of Electronic Engineering, South China Agricultural University， Guangzhou

510642，China)

Abstract: Electronic digital clock is a device with digital circuit technology when the time, minutes and seconds, compared with the mechanical clock with higher accuracy and intuitive, so get a wide range of use. Electronic digital clock is a typical digital circuit, which includes the combinational logic circuit and the sequential circuit. Through the production of digital electronic clock can further understanding of various is used in the production of small and medium scale integrated circuits and method of use, through its further study and master the variety of combinational logic circuits and sequential circuits using principle and method. The design of digital electronic clock is mainly using 74ls90 technology function to achieve the electronic bell when the minutes of the jump, the whole design is divided to six modules: modules, sub module, second module, signal generation and frequency division module, correction module. The whole point timekeeping module. The signal generation and frequency division is by oscillator with a frequency divider CD4060 completed, and correction through joins SR flip-flop to shake function.

Key words：CD4511 74LS90 SR flip-flop crystal oscillator correction circuit

目 录

1 前言 ........................................................................................................................................ 1 2 设计任务 ................................................................................................................................ 1 2.1 设计指标 ............................................................................................................................. 1 2.2 设计要求 ............................................................................................................................. 1 2.3 编写设计报告 ..................................................................................................................... 1 3 数字钟电路系统设计 ............................................................................................................ 2 3.1 时间脉冲产生电路 ............................................................................................................. 2 3.2 分频电路 ............................................................................................................................. 3 3.3 时间计数器电路 ................................................................................................................. 3 3.4 译码驱动电路 ..................................................................................................................... 5 3.5 显示电路 ............................................................................................................................. 6 3.6 校时电源电路 ..................................................................................................................... 6 3.7 整点报时电路 ..................................................................................................................... 6 4 仿真情况 ................................................................................................................................ 7 5 结论 ........................................................................................................................................ 7 6 课程设计的收获、体会和建议 ............................................................................................ 7 参考文献 ...................................................................................................................................... 8 附录 .............................................................................................................................................. 9