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HT45F5Q Datasheet(PDF) 46 Page - Holtek Semiconductor Inc |
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HT45F5Q Datasheet(HTML) 46 Page - Holtek Semiconductor Inc |
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46 / 114 page  Rev. 1.10 4� De�e��e� 1�� �01� Rev. 1.10 47 De�e��e� 1�� �01� HT45F5Q Charger Flash MCU HT45F5Q Charger Flash MCU “ CLR WDT”Inst�u�tion 8-stage Divide� WDT P�es�ale� WE4~WE0 �its WDTC Registe� Reset MCU fLIRC fLIRC/�8 8-to-1 MUX CLR WS�~WS0 WDT Ti�e-out (�8/fLIRC ~ �15/fLIRC) “ HALT”Inst�u�tion LIRC RES pin �eset Watchdog Timer Reset and Initialisation Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicecanbeset tosomepredeterminedconditionirrespectiveofoutsideparameters.Themostimportantreset conditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase,internalcircuitrywill ensurethatthemicrocontroller,afterashortdelay,willbeinawelldefinedstateandreadyto executethefirstprograminstruction.Afterthispower-onreset,certainimportantinternalregisters willbesettodefinedstatesbeforetheprogramcommences.OneoftheseregistersistheProgram Counter,whichwillberesettozeroforcingthemicrocontrollertobeginprogramexecutionfromthe lowestProgramMemoryaddress. Inadditiontothepower-onreset,situationsmayarisewhereitisnecessarytoforcefullyapply aresetconditionwhenthemicrocontrollerisrunning.Oneexampleofthisiswhereafterpower hasbeenappliedandthemicrocontrollerisalreadyrunning,theRESlineisforcefullypulledlow. Insuchacase,knownasanormaloperationreset,someofthemicrocontrollerregistersremain unchangedallowingthemicrocontrollertoproceedwithnormaloperationaftertheresetlineis allowedtoreturnhigh. AnothertypeofresetiswhentheWatchdogTimeroverflowsandresetsthemicrocontroller.All typesofresetoperationsresultindifferentregisterconditionsbeingsetup.Anotherresetexistsinthe formofaLowVoltageReset,LVR,whereafullresetisimplementedinsituationswherethepower supplyvoltagefallsbelowacertainthreshold. Reset Functions Thereareseveralwaysinwhichamicrocontrollerresetcanoccur,througheventsoccurringboth internallyandexternally: Power-on Reset Themostfundamentalandunavoidableresetistheonethatoccursafterpowerisfirstappliedto themicrocontroller.AswellasensuringthattheProgramMemorybeginsexecutionfromthefirst memoryaddress,apower-onresetalsoensuresthatcertainotherregistersarepresettoknown conditions.AlltheI/Oportandportcontrolregisterswillpowerupinahighconditionensuringthat allpinswillbefirstsettoinputs. RE S VD D In te r nal R es et 0. 9 V DD t RS TD + t SST t RS TD + t SST Note:tRSTDispower-ondelay,typicaltime=50ms Power-On Reset Timing Chart |
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