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HT45F3830 Datasheet(PDF) 47 Page - Holtek Semiconductor Inc |
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HT45F3830 Datasheet(HTML) 47 Page - Holtek Semiconductor Inc |
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47 / 149 page  Rev. 1.10 4� �an�a�� 0�� �01� Rev. 1.10 4� �an�a�� 0�� �01� HT45F3830 Ultrasonic Atomizer Flash MCU HT45F3830 Ultrasonic Atomizer Flash MCU Reset and Initialisation Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicecanbeset tosomepredeterminedconditionirrespectiveofoutsideparameters.Themostimportantreset conditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase,internalcircuitrywill ensurethatthemicrocontroller,afterashortdelay,willbeinawelldefinedstateandreadyto executethefirstprograminstruction.Afterthispower-onreset,certainimportantinternalregisters willbesettodefinedstatesbeforetheprogramcommences.OneoftheseregistersistheProgram Counter,whichwillberesettozeroforcingthemicrocontrollertobeginprogramexecutionfromthe lowestProgramMemoryaddress. AnothertypeofresetiswhentheWatchdogTimeroverflowsandresetsthemicrocontroller.All typesofresetoperationsresultindifferentregisterconditionsbeingsetup.Anotherresetexistsinthe formofaLowVoltageReset,LVR,whereafullresetisimplementedinsituationswherethepower supplyvoltagefallsbelowacertainthreshold. Reset Functions Thereareseveralwaysinwhichamicrocontrollerresetcanoccur,througheventsoccurring internally: Power-on Reset Themostfundamentalandunavoidableresetistheonethatoccursafterpowerisfirstappliedto themicrocontroller.AswellasensuringthattheProgramMemorybeginsexecutionfromthefirst memoryaddress,apower-onresetalsoensuresthatcertainotherregistersarepresettoknown conditions.AlltheI/Oportandportcontrolregisterswillpowerupinahighconditionensuringthat allpinswillbefirstsettoinputs. VDD Powe�-on Reset SST Time-o�t tRSTD Power-On Reset Timing Chart Low Voltage Reset – LVR Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageofthe device.TheLVRfunctionisalwaysenabledwithaspecificLVRvoltage,VLVR.Ifthesupplyvoltage ofthedevicedropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery, theLVRwillautomaticallyresetthedeviceinternallyandtheLVRFbitintheCTRLregisterwill alsobesethigh.ForavalidLVRsignal,alowvoltage,i.e.,avoltageintherangebetween0.9V~VLVR mustexistforgreaterthanthevaluetLVRspecifiedintheLVD&LVRcharacteristicstable.Ifthelow voltagestatedoesnotexceedthisvalue,theLVRwillignorethelowsupplyvoltageandwillnot performaresetfunction. |
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