基于单片机的数字电压表设计毕设.doc
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2023-06-07
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目 录
设计总说明 ................................................................1
Design General Information ................................................2
1 绪论 ....................................................................4
1.1 课题的背景及意义...................................................4
1.2 数字电压表的简介...................................................4
2 系统的方案设计与论证 ....................................................5
2.1 数字电压表原理.....................................................5
2.2 数字电压表设计要求.................................................5
3 系统硬件结构设计 ........................................................5
3.1 电源电路...........................................................6
3.2 单片机芯片选择.....................................................7
3.2.1 AT89C51 主要特性..............................................8
3.2.2 管脚说明 .....................................................9
3.2.3 内部单元.....................................................10
3.2.4 中断 ........................................................13
3.2.5 芯片擦除 ....................................................15
3.2.6 结构特点 ....................................................15
3.3 A/D 转换电路 ......................................................16
3.3.1 TLC2543 的特点...............................................16
3.3.2 TLC2543 的引脚说明...........................................17
3.3.3 TLC2543 控制字...............................................18
3.3.4 TLC2543 接口时序.............................................20
3.4 显示电路..........................................................22
3.5 复位电路..........................................................24
3.6 晶振电路..........................................................24
4 系统软件设计 ...........................................................26
4.1 主程序流程图......................................................26
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