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1、TheapplicationofmicrocontrollerinclosedcaptionsystemAbstractThispaperdescribesournewlydesignedmicrocontrollersforClosedCaptionsystemapplication.ThesemicrocontrollersintegratetheClosedCaptiondecodingfunctionandotherfunctionsrequiredforTVsetcontrol.1.Introdu
2、ctionMicrocontrollersthatutilizetheClosedCaptionfunctionhavebeendeveloped.TheClosedCaptiondecodingfunctionmustbeprovidedforallTVsetssoldintheU.S.fronJuly1993.Thesebasicsystemdevelopmentguidelineswereasfollows:(1)Thesystemmustprovidestabilizedreception.(2)T
3、hesystemshouldofferlow-costoperation.Thekeywordforthisdevelopmentwasfull-function.InregulationsestablishedonApril12,1991,theFCCspecifiedthetextmodeasbeingoptional,thusreflectingthatcommitteeonlow-costsystems.WithourgoalofsupplyingClosedCaptionhardwareasane
4、winformationmedium,wedecidedtodevelopasystemsatisfyingthespecificationsforalloptions.Lastyearweintroducedtheadd-ontypeofClosedCaptionDecoderLSIkitdesignedforeasyinstallationintoexistingTVsets.TheClosedCaptiondecodingfunctionisimplementedefficientlybymicroc
5、ontrollersdescribedinthispaper.Thehigh-performanceOn-ScreenDisplayfunctionforClosedCaptionapplicationcanbeusedforeasyTVsetoperation.第20页共20页Thisnewmicrocontrollerisalowcost,highaccuracyinstrumentationthatrequiresonlyoneexternalresistortosetgainsof1to10,000
6、.Furthermore,Thisnewmicrocontrollerfeatures32-leadSOICandDIPpackagingthatissmallerthandiscretedesignsandofferslowerpower,makingitagoodfitforclosedcaptionsystemandportable(orremote)applications.Thisnewmicrocontroller,withitshighaccuracyof40ppmmaximumnonline
7、arity,lowoffsetvoltageof50µVmax,andoffsetdriftof0.6µV/°Cmax,isidealforuseinprecisiondataacquisitionsystems’transducerinterfaces.Furthermore,thelownoise,lowinputbiascurrent,andlowpowerofThisnewmicrocontrollermakeitwellsuitedformedicalapplications,suchasECGa
8、ndnoninvasivebloodpressuremonitors.Thelowinputbiascurrentof1.0nAmaxismadepossiblewiththeuseofprocessingintheinputstage.Thisnewmicrocontrollerworkswellasapreamplifierduetoitslowinputvoltagenoiseof9nV/Hzat1kHz,
