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HT45F75 bảng dữ liệu(PDF) 57 Page - Holtek Semiconductor Inc |
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HT45F75 bảng dữ liệu(HTML) 57 Page - Holtek Semiconductor Inc |
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57 / 190 page  Rev. 1.10 5� De�e��e� 1�� �01� Rev. 1.10 57 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Programming Considerations TheHXTandLXToscillatorsbothusethesameSSTcounter.Forexample,ifthesystemiswoken upfromtheSLEEP0ModeandboththeHXTandLXToscillatorsneedtostart-upfromanoffstate. TheLXToscillatorusestheSSTcounterafterHXToscillatorhasfinisheditsSSTperiod. • IfthedeviceiswokenupfromtheSLEEP0ModetotheNORMALMode,thehighspeedsystem oscillatorneedsanSSTperiod.ThedevicewillexecutefirstinstructionafterHTOis“1”.Atthis time,theLXToscillatormaynotbestabilityiffSUBisfromLXToscillator.Thesamesituation occursinthepower-onstate.TheLXToscillatorisnotreadyyetwhenthefirstinstructionis executed. • IfthedeviceiswokenupfromtheSLEEP1ModetoNORMALMode,andthesystemclock sourceisfromHXToscillatorandFSTENis“1”,thesystemclockcanbeswitchedtotheLXT orLIRCoscillatorafterwakeup. • Thereareperipheralfunctions,suchasWDT,TMsandSIM,forwhichthefSYSisused.Ifthe systemclocksourceisswitchedfromfHtofSUB,theclocksourcetotheperipheralfunctions mentionedabovewillchangeaccordingly. Watchdog Timer TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheinternalclock,fS,whichisinturnsuppliedby oneoftwosourcesselectedbyconfigurationoption:fSUBorfSYS/4.ThefSUBclockcanbesourced fromeithertheLXTorLIRCoscillators,againchosenviaaconfigurationoption.TheWatchdog Timersourceclockisthensubdividedbyaratioof28to218togivelongertimeouts,theactualvalue beingchosenusingtheWS2~WS0bitsintheWDTCregister.TheLIRCinternaloscillatorhas anapproximateperiodof32kHzatasupplyvoltageof5V.However,itshouldbenotedthatthis specifiedinternalclockperiodcanvarywithVDD,temperatureandprocessvariations.TheLXT oscillatorissuppliedbyanexternal32.768kHzcrystal.TheotherWatchdogTimerclocksource optionisthefSYS/4clock. Watchdog Timer Control Register Asingleregister,WDTC,controlstherequiredtimeoutperiodaswellastheenable/disable operation.Thisregistertogetherwithseveralconfigurationoptionscontroltheoveralloperationof theWatchdogTimer. |
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