目录摘要..................................................................................................................................................IAbstract............................................................................................................................................II第一章绪论...................................................................................................................................11.1课题研究的背景及意义...................................................................................................11.2国内外研究现状和发展...................................................................................................11.3本文的研究内容..............................................................................................................2第二章系统分析与设计方案.......................................................................................................32.1系统分析..........................................................................................................................32.1.1功能及指标...........................................................................................................32.2系统总体方案设计...........................................................................................................32.2.1方案设计的基本思路...........................................................................................32.2.2数字电压表的两种设计方案...............................................................................32.2.3A/D转换模块的选择..........................................................................................42.2.4接口模块的选择...................................................................................................42.2.5微控制器的选择...................................................................................................52.3系统硬件分析....................................................................................................................52.3.1AT89S52单片机简介............................................................................................62.3.2LCD1602显示器简介............................................................................................62.3.3ADC0804转换芯片简介........................................................................................7第三章系统硬件电路设计...........................................................................................................83.1系统组成............................................................................................................................83.2电源接口电路....................................................................................................................83.3AT89S52单片机最小系统电路........................................................................................83.3.2复位电路..............................................................................................................93.3.3晶振电路............................................................................................................103.4LCD1602显示电路..........................................................................................................103.6A/D转换电路................................................
