目录
摘 要 ..........................................................................................................................I
Abstract..........................................................................................................................II
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........................................................................................9
3.1 系统组成..............................................................................................................................9
3.2 电源接口电路......................................................................................................................9
3.3 AT89S52 单片机最小系统电路.........................................................................................9
3.3.2 复位电路................................................................................................................10
3.3.3 晶振电路................................................................................................................11
3.4 LCD1602 显示电路...........................................................................................................12
3.6 A/D 转换电路....................................................................................................................12
3.7 量程转换电路...................................................................................................................12
第四章 系统软件设计................................................................................................14
4.1 系统主程序流程图...........................................................................................................14
4.2 LCD1602 液晶流程图.......................................................................................................14
4.3 ADC0804 流程图 ..............................................................................................................15
第五章 性能测试与分析..........................................................................................16
5.1 各模块独立测试...............................................................................................................16
5.2 系统联合调试...................................................................................................................16
5.3 系统运行评估...................................................................................................................17
第六章 总 结............................................................................................................18
参考文献......................................................................................................................19
致 谢............................................................................................................................20
附录 1: 系统原理图及实物图....................................................................................21