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毕业设计 单片机的设计，共32页，12780字
目录
第一章 概述 ....................................................................................................................................................17
1.1 单片机的概述 ...................................................................................................................................17
1.2 单片机的历史发展 ...........................................................................................................................18
1.3 单片机的组成 ...................................................................................................................................18
1.4 单片机的特点 ...................................................................................................................................19
1.5 单片机的分类 ...................................................................................................................................19
第二章 数字钟的基本组成及工作原理..........................................................................................................20
2.1 数字钟的组成 ...................................................................................................................................20
2.2 数字钟的工作原理 ...........................................................................................................................20
2.2.1 晶体振荡器电路 ......................................................................................................................21
2.2.2 分频器电路 ..............................................................................................................................21
2.2.3 时间计数单元 ........................................................................................................................ .21
2.2.4 译码驱动及显示单元 ............................................................................................................ .21
2.2.5校时电源电路 ............................................................................................................................22
2.2.6整点报时电路 ............................................................................................................................22
第三章 硬件设计 ...........................................................................................................................................23
3.1 方案选择 ..........................................................................................................................................23
3.2 单片机的选型 ..................................................................................................................................23
3.2.1 AT89C51的简介 ....................................................................................................................23
3.2.2 AT89C51的主要性能 ............................................................................................................24
3.2.3 AT89C51的引脚说明 ............................................................................................................24
3.2.4 振荡器特性 .............................................................................................................................26
3.3 实验器材 ..........................................................................................................................................26
3.4 数字钟的设计步骤 ..........................................................................................................................27
第四章 软件设计与流程 ...............................................................................................................................31
4.1 主程序................................................................................................................................................31
4.2 定时和串口程序................................................................................................................................31
4.3 数据的显示与刷新 ............................................................................................................................32
4.4 键盘响应程序 ....................................................................................................................................33
4.5系统性能测试与功能说明 .................................................................................................................33
4.5.1定时计数器的初始值设置公式推导 ........................................................................................33
4.5.2 系统功能与操作说明 .............................................................................................................34
第五章 总结 ...................................................................................................................................................36
致谢 ...................................................................................................................................................................37
参考文献 ...........................................................................................................................................................38
附录一：电路原理图 .......................................................................................................................................39
附录二：程序框图 ...........................................................................................................................................40
附录三：程序 ...................................................................................................................................................41