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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3W 데이터시트(PDF) 65 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 65 Page - Holtek Semiconductor Inc |
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65 / 167 page  Rev. 1.50 �4 De�e��e� 01� �01� Rev. 1.50 �5 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU Reset and Initialisation Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicecanbeset tosomepredeterminedconditionirrespectiveofoutsideparameters.Themostimportantreset conditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase,internalcircuitrywill ensurethatthemicrocontroller,afterashortdelay,willbeinawelldefinedstateandreadyto executethefirstprograminstruction.Afterthispower-onreset,certainimportantinternalregisters willbesettodefinedstatesbeforetheprogramcommences.OneoftheseregistersistheProgram Counter,whichwillberesettozeroforcingthemicrocontrollertobeginprogramexecutionfromthe lowestProgramMemoryaddress. AnothertypeofresetiswhentheWatchdogTimeroverflowsandresets.Alltypesofresetoperations resultindifferentregisterconditionsbeingsetup.AnotherresetexistsintheformofaLowVoltage Reset,LVR,whereafullreset,isimplementedinsituationswherethepowersupplyvoltagefalls belowacertainthreshold. Reset Functions Thereareseveralwaysinwhicharesetcanoccur,eachofwhichwillbedescribedasfollows. Power-on Reset Themostfundamentalandunavoidableresetistheonethatoccursafterpowerisfirstappliedto themicrocontroller.AswellasensuringthattheProgramMemorybeginsexecutionfromthefirst memoryaddress,apower-onresetalsoensuresthatcertainotherregistersarepresettoknown conditions.AlltheI/Oportandportcontrolregisterswillpowerupinahighconditionensuringthat allI/Oportswillbefirstsettoinputs. VDD Powe�-on Reset SST Ti�e-out tRSTD Power-On Reset Timing Chart Low Voltage Reset – LVR Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageof thedevice.TheLVRfunctionisalwaysenabledwithaspecificLVRvoltage,VLVR.Ifthesupply voltageofthedevicedropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchanging thebattery,theLVRwillautomaticallyresetthedeviceinternally.TheLVRincludesthefollowing specifications:ForavalidLVRsignal,alowvoltage,i.e.,avoltageintherangebetween0.9V~VLVR mustexistforgreaterthanthevaluetLVRspecifiedintheLVRElectricalCharacteristics.Ifthelow voltagestatedoesnotexceedtLVR,theLVRwillignoreitandwillnotperformaresetfunction.The actualVLVRvaluecanbeselectedbytheLVS7~LVS0bitsintheLVRCregister.IftheLVS7~LVS0 bitsarechangedtosomecertainvaluesbytheenvironmentalnoiseorsoftwaresetting,theLVRwill resetthedeviceafter2~3LIRCclockcycles.Whenthishappens,theLRFbitintheSMOD1register willbesetto1.Afterpowerontheregisterwillhavethevalueof01010101B.NotethattheLVR functionwillbeautomaticallydisabledwhenthedeviceentersthepowerdownmode. LV R In te r nal R es et t RS TD + t SST Low Voltage Reset Timing Chart |
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