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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F4MA датащи(PDF) 48 Page - Holtek Semiconductor Inc |
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HT45F4MA датащи(HTML) 48 Page - Holtek Semiconductor Inc |
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48 / 145 page  Rev. 1.20 �8 De�e��e� 1�� 201� Rev. 1.20 �9 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU “ CLR WDT”Inst�u�tion 8-stage Divide� WDT P�es�ale� WE�~WE0 �its WDTC Registe� Reset MCU LIRC fSUB fSUB/28 8-to-1 MUX CLR WS2~WS0 (fSUB/28 ~ fSUB/218) WDT Ti�e-out (28/fSUB ~ 218/fSUB) Watchdog Timer 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 Therearefourwaysinwhichamicrocontrollerresetcanoccur,througheventsoccurringinternally: Power-on Reset Themostfundamentalandunavoidableresetistheonethatoccursafterpowerisfirstappliedto themicrocontroller.AswellasensuringthattheProgramMemorybeginsexecutionfromthefirst memoryaddress,apower-onresetalsoensuresthatcertainotherregistersarepresettoknown conditions.AlltheI/Oportandportcontrolregisterswillpowerupinahighconditionensuringthat allpinswillbefirstsettoinputs. VDD Powe�-on Reset SST Ti�e-out t RSTD Note:tRSTDispower-ondelay,typicaltime=50ms Power-On Reset Timing Chart |
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