目 录
第一章 绪 论.......................................................................................................................................1
1.1 课题研究的背景及意义.......................................................................................................1
1.2 国内外研究现状和发展.......................................................................................................1
1.3 本文的研究内容...................................................................................................................2
第二章 系统分析与设计方案............................................................................................................3
2.1 系统分析...............................................................................................................................3
2.1.1 功能及指标................................................................................................................3
2.2 系统总体方案设计...............................................................................................................3
2.2.1 方案设计的基本思路................................................................................................3
2.2.2 数字电压表的两种设计方案....................................................................................4
2.2.3 A/D 转换模块的选择................................................................................................4
2.2.4 接口模块的选择........................................................................................................5
2.2.5 微控制器的选择........................................................................................................5
2.3 系统硬件分析.......................................................................................................................6
2.3.1 AT89S52 单片机简介................................................................................................6
2.3.2 LCD1602 显示器简介...............................................................................................7
2.3.3 ADC0804 转换芯片简介...........................................................................................7
第三章 系统硬件电路设计................................................................................................................8
3.1 系统组成...............................................................................................................................8
3.2 电源接口电路.......................................................................................................................8
3.3 AT89S52 单片机最小系统电路...........................................................................................8
3.3.2 复位电路....................................................................................................................9
3.3.3 晶振电路..................................................................................................................10
3.4 LCD1602 显示电路............................................................................................................11
3.6 A/D 转换电路......................................................................................................................11
3.7 量程转换电路.....................................................................................................................11
第四章 系统软件设计......................................................................................................................12
4.1 系统主程序流程图.............................................................................................................12
4.2 LCD1602 液晶流程图........................................................................................................13
4.3 ADC0804 流程图................................................................................................................14
第五章 性能测试与分析..................................................................................................................15
5.1 各模块独立测试.................................................................................................................15
5.2 系统联合调试.....................................................................................................................15
5.3 系统运行评估.....................................................................................................................16
第六章 总 结.....................................................................................................................................17
参考文献（References）.................................................................................................................18
致 谢.................................................................................................................................................19
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