目 录1 引言..............................................................12 设计原理及要求....................................................2数字电压表的实现原理............................................2数字电压表的设计要求............................................23 软件仿真电路设计..................................................3设计思路........................................................3仿真电路图......................................................3设计过程........................................................4 AT89C51 的功能介绍..............................................4简单概述.....................................................4主要功能特性.................................................5 AT89C51 的引脚介绍..........................................5 ADC0808 的引脚及功能介绍........................................7芯片概述.....................................................7 引脚简介....................................................8 ADC0808 的转换原理..........................................8 74LS373 芯片的引脚及功能........................................9芯片概述.....................................................9引脚介绍.....................................................9 LED 数码管的控制显示............................................9 LED 数码管的模型............................................9 LED 数码管的接口简介.......................................104 系统软件程序的设计...............................................10 主程序........................................................10 A/D 转换子程序.................................................11 中断显示程序..................................................125 电压表的调试及性能分析...........................................13 调试与测试....................................................13 性能分析......................................................146 电路仿真图.......................................................147 总结.........
