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HT66F60 Datasheet(PDF) 68 Page - Holtek Semiconductor Inc |
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HT66F60 Datasheet(HTML) 68 Page - Holtek Semiconductor Inc |
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68 / 298 page  Rev. 1.90 68 �e���a�� 18� �01� Rev. 1.90 69 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM Wake-up AfterthesystementerstheSLEEPorIDLEMode,itcanbewokenupfromoneofvarioussources listedasfollows: • Anexternalreset • AnexternalfallingedgeonPortA • Asysteminterrupt • AWDToverflow Ifthesystemiswokenupbyanexternalreset,thedevicewillexperienceafullsystemreset, however,ifthedeviceiswokenupbyaWDToverflow,aWatchdogTimerresetwillbeinitiated. Althoughbothofthesewake-upmethodswillinitiatearesetoperation,theactualsourceofthe wake-upcanbedeterminedbyexaminingtheTOandPDFflags.ThePDFflagisclearedbya systempower-uporexecutingtheclearWatchdogTimerinstructionsandissetwhenexecutingthe “HALT”instruction.TheTOflagissetifaWDTtime-outoccurs,andcausesawake-upthatonly resetstheProgramCounterandStackPointer,theotherflagsremainintheiroriginalstatus. EachpinonPortAcanbesetupusingthePAWUregistertopermitanegativetransitiononthepin towake-upthesystem.WhenaPortApinwake-upoccurs,theprogramwillresumeexecutionat theinstructionfollowingthe"HALT"instruction.Ifthesystemiswokenupbyaninterrupt,then twopossiblesituationsmayoccur.Thefirstiswheretherelatedinterruptisdisabledortheinterrupt isenabledbutthestackisfull,inwhichcasetheprogramwillresumeexecutionattheinstruction followingthe"HALT"instruction.Inthissituation,theinterruptwhichwoke-upthedevicewillnot beimmediatelyserviced,butwillratherbeservicedlaterwhentherelatedinterruptisfinallyenabled orwhenastacklevelbecomesfree.Theothersituationiswheretherelatedinterruptisenabledand thestackisnotfull,inwhichcasetheregularinterruptresponsetakesplace.Ifaninterruptrequest flagissethighbeforeenteringtheSLEEPorIDLEMode,thewake-upfunctionoftherelated interruptwillbedisabled. 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",thesystemclockcanbeswitchedtotheLXTor LIRCoscillatorafterwakeup. • Thereareperipheralfunctions,suchasWDT,TMsandSIM,forwhichthefSYSisused.Ifthe systemclocksourceisswitchedfromfHtofL,theclocksourcetotheperipheralfunctions mentionedabovewillchangeaccordingly. • Theon/offconditionoffSUBandfSdependsuponwhethertheWDTisenabledordisabledasthe WDTclocksourceisselectedfromfSUB. |
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