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1、摘要随着电子信息产业的不断发展，信号频率的测量在科技研究和实际应用中的作用日益重要。科技的日新月异的高速发展，传统的频率计通常是用很多的逻辑电路和时序电路来实现的，这种电路一般运行较慢，而且测量频率的围较小。现在的客户对电子频率的测量也提出了新的要求，对于低档产品要求使用操作方便，量（够）宽，可靠性高，价格低。而对于中高档产品，则要求有高分辨率，高精度，高稳定度，高测量速率；除通常通用计数器所具有的功能外，还要有数据处理功能，统计分析功能，时域分析功能等等，或者包含电压测量等其他功能。这些要求有的已经实现或者部分实现，但要真正完美的实现这些目标，对于生产厂家来说，还有许多工作要做，而不是表面看
2、来似乎发展到头了。考虑到上述问题，本论文设计一个基于STC89C52单片机设计的频率计。首先，我们把待测信号经过放大整形，然后把信号送入单片机的定时计数器里进行计数，获的频率值，最后把测得的频率数值送入显示电路里进行显示。本文从频率计的原理出发，介绍了基于单片机的频率计的设计方案，选择了实现系统的各种电路元器件。关键词：单片机频率测量精度ABSTRACTWiththedevelopmentoftheelectronicinformationindustry,thesignalfrequencymeasurementinscienceandtechnologyresearchandpractic
3、alapplicationisincreasinglyimportant.Rapiddevelopmentofscienceandtechnologyofthehighspeeddevelopment,thetraditionalfrequencyisusuallyalotofprogramlogiccircuitandthesequentialcircuitstoimplementation,thiscircuit,generallyrunslower,andmeasurementofthefrequencyofthesmallareas.Nowthecustomersontheelectr
4、onicfrequencymeasurementhasalsoputforwardnewrequirements,lowproductrequirementstouseconvenientoperation,quantity(enough)wide,highreliabilityandlowprice.Andforhigh-gradegoods,itrequireahighresolution,highprecision,highstability,highmeasurementrate;Inadditiontogeneralcounterusuallyhavethefunctions,but
5、alsoadataprocessingfunctions,statisticalanalysisfunction,thetimedomainanalysisfunctionandsoon,orcontainvoltagemeasurement,andotherfunctions.Theserequirementshavebeenimplementedorpartiallyrealizedsome,buttoreallyperfectachievethesegoals,formanufacturersfor,thereisstillalotmoreworktodo,andnotsurfaceap
6、peartodevelopmentlimited.Inviewoftheaboveproblems,thispaperdesignedaSTC89C52basedonSCMdesignprojectoffrequency.Firstofall,wehavetobemeasuredsignalafterplasticsurgerytoenlarge,thenthesignaltothetimingofthesinglechipmicrocomputercountertocountforfrequencyvalue,andfinallyputthemeasurementoffrequencynum
7、ericalintotheshowcircuitdisplayed.Thispaper,fromthefrequencyoftheprincipleofproject,thispaperintroducestheprojectbasedonsinglechipmicrocomputerfrequency,thedesignofthesystemofthechoiceofcircuitcompone
