51单片机_频率计_1602

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1、广东海洋大学《单片机》课程设计说明书电子产品设计与开发结课论文题目：其于51单片机的频率计设计与仿真班级：电子1104班姓名：陈**（组员）学号：03电话：1376******成员：曾*（组长）学号：29电话：13726******成员：孙*（组员）学号：21电话：137*******27广东海洋大学《单片机》课程设计说明书目录一、需求分析二、方案设计1设计基本原理·······························································41.1测量频率的原理········································

2、···············41.2系统设计框图·························································4三、软件设计··································································527广东海洋大学《单片机》课程设计说明书1资源分配表·································································52程序流程框图···········································

3、····················6四、系统硬件线路设计图·····················································71单片机最小系统设计·······················································72液晶LCD1602显示电路····················································83频率测量电路······························································11五.系统仿真、测

4、试结果及性能分析·······································121系统仿真、测试结果27广东海洋大学《单片机》课程设计说明书························································122性能分析·····································································13六、心得与体会·································································14七、参考文献·····

5、································································14摘　要本设计提出了一种基于AT89C51单片机开发的数字频率测量仪的设计。系统以单片机AT89C51为核心，构成完备的测量系统。可以对信号进行频率的精确测量，测频在1Hz至10kHZ。采用液晶LCD1602显示被测信号的频率。与传统的电路系统相比，其有处理速度快、稳定性高、性价比高、硬件结构简单的优点。关键词：单片机；低频；绝对误差27广东海洋大学《单片机》课程设计说明书一、需求分析频27广东海洋大学《单片机》课程设计说明书率测量在科技研究和实际应用中的作用日

6、益重要。传统的频率计通采用组合电路和时序电路等大量的硬件电路构成，产品不但体积较大，运行速度慢，而且测量低频信号时不宜直接使用。频率信号抗干扰性强、易于传输,可以获得较高的测量精度。同时,频率测量方法的优化也越来越受到重视.并采用AT89C51单片机和相关硬软件实现。MCS—51系列单片机具有体积小，功能强，性能价格比较高等特点，因此被广泛应用于工业控制和智能化仪器，仪表等领域。我们研制的频率计以89c51单片机为核心，具有性能优良，精度高，可靠性好等特点。二、设计方案此次课程设计采用间接测量法来测量。要用到GATE信号，GATE=1时，TR0=1，INTO=1才能启动计数器，而计数器0是

7、通过外部中断INTO的下降沿开始触发的，计时器从0开始计时，计数器只能测高电平，因此测得的时间为半个周期。当计数器0计时溢出，执行m加1的操作。则测量时间为：t1=TH0*256+TL0+m*65536，所求频率F=1000000/(2*t1)1设计基本原理1.1测量频率的原理定时/计数器工作在方式1，每产生一次定时器0中断，计数65536个脉冲，此时的脉冲来自振荡器的12分频后的脉冲，其周期为1uS。根据产生外部中断0