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HT45R4U датащи(PDF) 58 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 58 Page - Holtek Semiconductor Inc |
58 / 105 page Rev. 1.10 �8 �a��� 1�� �01� Rev. 1.10 �9 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Buzzer OperatinginasimilarwaytotheProgrammableFrequencyDivider,theBuzzerfunctionprovides ameansofproducingavariablefrequencyoutput,suitableforapplicationssuchasPiezo-buzzer drivingorotherexternalcircuitsthatrequireaprecisefrequencygenerator.TheBZandBZpins formacomplementarypair,andarepin-sharedwithI/Opins,PA0andPA1.NotethattheBZpin istheinverseoftheBZpinwhichtogethergeneratesadifferentialoutputwhichcansupplymore powertoconnectedinterfacessuchasbuzzers. Thebuzzerisdrivenbytheinternalclocksource,fSUB,whichthenpassesthroughadivider,the divisionratioofwhichisselectedbyconfigurationoptionstoprovidearangeofbuzzerfrequencies fromfSUB/22tofSUB/29.TheclocksourcethatgeneratesfSUB,whichinturncontrolsthebuzzer frequency,originatesfromtheLXToscillator.Notethatthebuzzerfrequencyiscontrolledby softwareselectionbits,whichselecttheinternaldivisionratio. f SU B So ft wa re S el ec ti on B it s Di vi de b y 2 2 ~2 9 (B Z2 ~B Z0 ) BZ BZ Buzzer Function PA0/PA1 Pin Function Control ThepinfunctionofBZorBZisselectedbyENBZorENBZBsoftwarecontrolbitsrespectively. Whenthesoftwarecontrolbit,ENBZorENBZB,issetto1,thecorrespondingbuzzeroutput functionwillbeenabled.Otherwise,thebuzzeroutputfunctionwillbedisabledifthecorresponding softwarecontrolbitisclearedto0. Ifthepin-sharedsoftwarecontrolbitshaveselectedbothpinsPA0andPA1tofunctionasaBZand BZcomplementarypairofbuzzeroutputs,thenforcorrectbuzzeroperationitisessentialthatboth pinsmustbesetupasoutputsbysettingbitsPAC0andPAC1ofthePACportcontrolregisterto zero.ThePA0databitinthePAdataregistermustalsobesethightoenablethebuzzeroutputs,if setlow,bothpinsPA0andPA1willremainlow.InthiswaythesinglebitPA0ofthePAregistercan beusedasanon/offcontrolforboththeBZandBZbuzzerpinoutputs.NotethatthePA1databitin thePAregisterhasnocontroloverthebuzzerpin,PA1. Ifthepin-sharedsoftwarecontrolbithasselectedthatthePA0pinistofunctionasaBZbuzzerpin, thenthePA0mustbesetupasanoutputbysettingbitPAC0ofthePACportcontrolregistertozero. ThePA0databitinthePAdataregistermustalsobesethightoenablethebuzzeroutput,ifsetlow pinPA0willremainlow.InthiswaythePA0bitcanbeusedasanon/offcontrolfortheBZbuzzer pinPA0.IfthePAC0bitofthePACportcontrolregisterissethigh,thenpinPA0canstillbeused asaninputeventhoughthesoftwarecontrolbithasconfigureditasaBZoutput. Ifthepin-sharedsoftwarecontrolbithasselectedthatthePA1pinistofunctionasaBZbuzzerpin, thenthePA1mustbesetupasanoutputbysettingbitPAC1ofthePACportcontrolregistertozero. NotethatthePA0databitinthePAdataregistermustalsobesethightoenablethebuzzeroutput,if setlowpinPA0willremainlow.InthiswaythePA0bitcanbeusedasanon/offcontrolfortheBZ buzzerpinPA1.IfthePAC1bitofthePACportcontrolregisterissethigh,thenpinPA1canstillbe usedasaninputeventhoughthesoftwarecontrolbithasconfigureditasaBZoutput.Notethatthe PA1databitinthePAregisterstillhasnocontroloverthebuzzerpin,PA1. Notethatnomatterwhatconfigurationischosenforthebuzzer,iftheportcontrolregisterhassetup thepintofunctionasaninput,thenthiswilloverridethesoftwareselectionandforcethepinto alwaysbehaveasaninputpin.Thisarrangementenablesthepintobeusedasbothabuzzerpinand asaninputpin,soregardlessofthesoftwareselection;theactualfunctionofthepincanbechanged dynamicallybytheapplicationprogrambyprogrammingtheappropriateportcontrolregisterbit. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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