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Electronic Components Datasheet Search |
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HT45F75 Datasheet(PDF) 60 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 60 Page - Holtek Semiconductor Inc |
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60 / 190 page  Rev. 1.10 �0 De�e��e� 1�� �01� Rev. 1.10 �1 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU “CLR WDT” Inst�u�tion WE�~WE0 �its WDTC Registe� Reset MCU fS CLR “HALT” Inst�u�tion fSUB M U X Configu�ation option M U X fSYS/� LXT LIRC Configu�ation option 8-stage Divide� WDT P�es�ale� fS/�8 8-to-1 MUX WS�~WS0 WDT Ti�e-out Watchdog Timer Reset and Initialisation Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicecanbeset tosomepredeterminedconditionirrespectiveofoutsideparameters.Themostimportantreset conditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase,internalcircuitrywill ensurethatthemicrocontroller,afterashortdelay,willbeinawell-definedstateandreadyto 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 Note:tRSTDispower-ondelay,typicaltime=50ms Power-On Reset Timing Chart |
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