摘要：电子信息产业的日新月异，使得信号频率的测量在科研和日常生活中扮演着越来越重要的角色。传统的频率计大多以逻辑电路和时序电路来实现，运行速度较慢，且测量频率的范围较小。为了避免上述弊端，本论文设计以AT89S52单片机为控制核心的数字频率计,采用直接测频法，用放大电路、整形电路、单片机和数字显示线路组成的硬件部分来实现。该方案测频范围满足设计要求。可测方波、正弦波、三角波，频率范围为1HZ~9999HZ。关键词：数字频率计AT89S52单片机测量Abstract:Electronicinformationindustrywitheachpassingday,makethesignalfrequencymeasurementplayingamoreandmoreimportantroleinscientificresearchanddailylife.Mostoftraditionalfrequencymeterwithlogiccircuitsandsequentialcircuitstorealize,soitrunslowerandmeasuretherangeofmeasuringfrequencyisless.Inordertoavoidtheseproblems,thispaperdesignstheAT89S52singlechipmicrocomputerasthecoreofdigitalfrequencymeter,thedirectfrequencymeasurementmethodisadopted,withamplifyingcircuit,shapingcircuitanddigitaldisplaycircuit,single-chipcomputerhardwareparts.Theschemefrequencymeasuringrangemeetthedesignrequirements.Measurablesquarewave,sinewave,trianglewave,1HZ~9999HZfrequencyrange.Keywords:digitalfrequencymeterAT89S52singlechipmicrocomputermeasurement目录TOC\o"1-2"\h\uHYPERLINK\l_Toc11990第一章绪论PAGEREF_Toc119901HYPERLINK\l_Toc961.1频率计的研究背景PAGEREF_Toc961HYPERLINK\l_Toc217791.2本课题数字频率计的研究内容PAGEREF_Toc217791HYPERLINK\l_Toc11770第二章直接测频法与间接周期测频法PAGEREF_Toc117701HYPERLINK\l_Toc177792.1数字频率计的原理PAGEREF_Toc177791HYPERLINK\l_Toc253212.2方案比较与论证PAGEREF_Toc253212HYPERLINK\l_Toc162782.3设计思路PAGEREF_Toc162784HYPERLINK\l_Toc10324第三章系统硬件设计PAGEREF_Toc103244HYPERLINK\l_Toc225253.1系统设计概述PAGEREF_Toc225254HYPERLINK\l_Toc63413.2主芯片模块PAGEREF_Toc63415HYPERLINK\l_Toc324713.3放大整形模块PAGEREF_Toc324716HYPERLINK\l_Toc195393.4数字显示模块PAGEREF_Toc195397HYPERLINK\l_Toc148363.5系统总体原理图PAGEREF_Toc1483610HYPERLINK\l_Toc120993.6系统复位电路PAGEREF_Toc1209911HYPERLINK\l_Toc4980第四章系统软件设计PAGEREF_Toc498011HYPERLINK\l_Toc241764.1系统软件框图PAGEREF_Toc2417611HYPERLINK\l_Toc2815第五章系统调试PAGEREF_Toc281513HYPERLINK\l_Toc164455.1硬件调试PAGEREF_Toc1644513HYPERLINK\l_Toc13975