单片机方波频率检测和倍频系统论文.doc

本科毕业设计（论文） 基于单片机的方波频率检测和倍频系统设计 Design Based on SCM Square Wave Frequency Detection and Times Frequency System 基于单片机的方波频率检测和倍频系统设计 摘要：本文介绍了基于单片机的方波频率检测和倍频系统设计。该系统功能是检测由SP1642B型函数信号发生器作为方波发生源的方波，并检测出所输入的方波频率，然后由液晶显示器1602显示所检测到的方波频率，根据所检测到的频率作为原始频率，进行程序所设定的倍率的倍频，通过P1.2口输出倍频后的方波信号，最后用示波器显示其倍频后的方波波形以及方波频率。确定了方波频率检测倍频系统的软硬件设计方案。硬件系统包括原始频率输入电路、单片机主电路部分、按键及显示人机交互部分、倍频输出电路。确立了以STC89C52单片机为核心的硬件系统设计。软件系统采用c语言编写。 经过硬软件系统实现后的实验测定,改系统检测倍频功能达到设计要求,输出数值误差≤1%。 关键字：方波信号；频率检测；倍频；STC89C52；LCD1602； 中图分类号：TP391 Design Based on SCM Square Wave Frequency Detection and Times Frequency System Abstract: This article describes a design based on the square wave frequency detection of the microcontroller and multiplier system. The system function is the source detected by SP1642B function signal generator as a square wave square wave. And to detect the input square wave frequency , and then detected by the liquid crystal display 1602 shows the square wave frequency. Then detected by a liquid crystal display 1602 shows the square wave frequency, according to the detected frequency as the original frequency, Procedures set by the rate multiplier. P1.2 port output multiplier of the square wave signal. Finally , with an oscilloscope to display the square wave frequency doubling and square-wave frequency. The square wave frequency detection multiplier system hardware and software design. The hardware system consists of the original frequency input circuit , the microcontroller main circuit part of the button and display human-computer interaction part , the multiplier output circuit. Established as the core of STC89C52 microcontroller hardware system design. Using C language as programming language After determination of the experimental hardware and software system , change the system detects a multiplier function to meet the design requirements , the output of numerical error less than 1 % . Keywords: Square wave signal ; frequency detection; multiplier;STC89C52; ICL8038 Classification: TP39