目录
第一章 前言 ...............................................................................1
1.1 频率计概述...........................................................................1
1.2 频率计发展与应用.....................................................................1
1.3 频率计设计内容.......................................................................1
第二章 系统总体方案设计 ...................................................................2
2.1 测频的原理...........................................................................2
2.2 总体思路.............................................................................3
2.3 具体模块.............................................................................3
第三章 硬件电路具体设计 ...................................................................4
3.1 AT89C52 主控制器模块 .................................................................4
3.1.1 AT89C52 的介绍...................................................................4
3.1.2 复位电路及时钟电路 ..............................................................5
3.1.3 引脚功能 ........................................................................6
3.1.4 单片机引脚分配 ..................................................................8
3.2 放大整形模块.........................................................................8
3.3 分频设计模块 ........................................................................9
3.3.1 分频电路分析 ....................................................................9
3.3.2 74LS161 芯片介绍................................................................10
3.3.3 74LS151 芯片介绍................................................................11
3.3.4 分频电路 .......................................................................12
3.4 显示模块 ...........................................................................12
3.4.1 数码管介绍 .....................................................................13
第四章 系统的软件设计 ....................................................................13
4.1 软件模块设计 .......................................................................13
4.2 中断服务子程序 .....................................................................14
4.3 显示子程序 .........................................................................15
4.4 量程档自动转换子程序 ...............................................................16
4.5 应用软件简介 .......................................................................17
4.5.1 Keil 简介.......................................................................17
4.5.2 protues 简介....................................................................18
第五章 频率计的系统调试 ..................................................................19
5.1 硬件调试 ...........................................................................19
5.1.1 整形模块调试....................................................................19
5.1.2 分频模块调试....................................................................21
5.2 软件调试 ...........................................................................21
5.3 系统调试............................................................................22
5.3.1 系统软件调试 ...................................................................22
5.4 误差分析 ...........................................................................22
第六章 总结 ..............................................................................22
