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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT66F002 데이터시트(PDF) 49 Page - Holtek Semiconductor Inc |
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HT66F002 데이터시트(HTML) 49 Page - Holtek Semiconductor Inc |
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49 / 144 page  Rev. 1.71 48 April 11, 2017 Rev. 1.71 49 April 11, 2017 HT66F002/HT66F0025/HT66F003/HT66F004 Cost-Effective A/D Flash MCU with EEPROM HT66F002/HT66F0025/HT66F003/HT66F004 Cost-Effective A/D Flash MCU with EEPROM Themaximumtime-outperiodiswhenthe215divisionratioisselected.Asanexample,witha32 kHzLIRCoscillatorasitssourceclock,thiswillgiveamaximumwatchdogperiodofaround1 secondforthe215divisionratio,andaminimumtimeoutof7.8msforthe28divisionration. “ CLR WDT”Instruction 11-stage Divider 7-stage Divider WE4~WE0 bits WDTC Register Reset MCU LIRC fLIRC 8-to-1 MUX CLR WS2~WS0 (fLIRC/21 ~ fLIRC/211) WDT Time-out (28/fLIRC ~ 215/fLIRC) RES pin reset “ HALT”Instruction Watchdog Timer Reset and Initialisation Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicescanbeset 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. |
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