目 录

一、设计正文 ?????????????????????(1) 二、附录

1. 设计任务书?????????????????????(32) 2. 设计中期检查报告??????????????????(34) 3. 指导教师指导记录表?????????????????(35) 4. 设计结题报告????????????????????(36) 5. 成绩评定及答辩评议表????????????????(37) 6. 设计答辩过程记录??????????????????(40)

I

基于Proteus软件的单片机数字时钟系统设计与仿真

摘 要：近年来随着计算机在社会领域的渗透和大规模集成电路的发展，单片机的应用正在不断地走向深入，由于它具有功能强，体积小，功耗低，价格便宜，工作可靠，使用方便等特点，因此越来越广泛地应用各个领域.

本文的电子钟系统是以单片机（AT89C51）为核心，时钟芯片DS1302、数码管显示驱动芯片MAX7219等元器件组成。具体介绍应用Proteus的ISIS软件进行单片机系统的电子钟设计与仿真的实现方法。该方法既能准确验证所设计的系统是否满足技术要求,又能提高系统设计的效率和质量,降低开发成本,具有推广价值。

关键词：单片机、时钟芯片、数码管显示驱动芯片、Proteus、电子钟

II

Design and Simulation Of electronic clock Based on

Proteus Software System

Abstract ：In recent years, with computers in the infiltration and the development of large-scale integrated circuits. SCM application is steadily deepening, as it has strong function, small size, low power dissipation, low prices, reliable, easy to use features, it is particularly suited to and control of the system, increasingly widely used in various fields.

This article describes an electronic bell system is single-chip microcomputer (AT89C51) as the core, the clock chip DS1302, LED display driver chip components, such as MAX7219 component.Describes the application of Proteus's ISIS software of the electronic single-chip system clock to achieve the design and simulation methods in details.The method can not only test the property of the system precisely,but also improve development efficiency and reduce development cost,which values in popularity.

Key words： AT89C51、DS1302、MAX7219、Proteus、 electronics clock

III

目 录

1 绪论 ............................................................................................................................................... - 1 - 1.1引 言 ...................................................................................................................................... - 1 - 1.2 PROTEUS软件简介 ............................................................................................................... - 1 - 2系统设计 ....................................................................................................................................... - 3 - 2.1电子钟系统硬件组成 ...................................................................................................... - 3 - 2.2 AT89C51单片机简介 ....................................................................................................... - 4 -

2.2.1.主要特性 ................................................................................................................ - 5 - 2.2.2.管脚说明 ................................................................................................................ - 5 - 2.3实时时钟电路DS1302工作原理 ................................................................................. - 8 -

2.3.1 DS1302的结构及工作原理 .............................................................................. - 8 - 2.3.3 DS1302的寄存器 ................................................................................................. - 9 - 2.4 MAX7219工作原理简介 ................................................................................................ - 10 -

2.4.1.引脚分配及功能 ................................................................................................ - 11 - 2.4.2.寄存器介绍 ......................................................................................................... - 12 - 2.5 数码管介绍 ....................................................................................................................... - 14 -

2.5.1数码管的分类 ..................................................................................................... - 14 - 2.5.2 数码管的应用..................................................................................................... - 15 - 2.5.6 数码管使用的电流与电压 ............................................................................. - 15 - 2.6 电子时钟系统设计流程 ............................................................................................... - 16 - 3硬件电路设计............................................................................................................................ - 17 - 3.1 电路原理图设计 ............................................................................................................. - 17 - 3.2 PROTEUS 电路图设计 ....................................................................................................... - 18 - 4软件设计 .................................................................................................................................... - 19 - 4.1 程序流程图设计 ............................................................................................................. - 19 - 4.2 源程序设计 ....................................................................................................................... - 20 - 4.3 KEILC51进行程序调试 .................................................................................................. - 25 - 5.系统调试与仿真...................................................................................................................... - 27 - 5.1 PROTEUS中HEX 文件选择 ............................................................................................... - 27 - 5.2 PROTEUS进行电子钟系统仿真 ..................................................................................... - 28 - 结束语 ............................................................................................................................................. - 29 -

IV

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