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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3W 데이터시트(PDF) 107 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 107 Page - Holtek Semiconductor Inc |
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107 / 167 page  Rev. 1.50 10� De�e��e� 01� �01� Rev. 1.50 107 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU A/D Operation TheSTARTbitintheADCRregisterisusedtostartandresettheA/Dconverter.Whenthe microcontrollersetsthisbitfromlowtohighandthenlowagain,ananalogtodigitalconversion cyclewillbeinitiated.WhentheSTARTbitisbroughtfromlowtohighbutnotlowagain,the EOCBbitintheADCRregisterwillbesethighandtheanalogtodigitalconverterwillbereset.It istheSTARTbitthatisusedtocontroltheoverallstartoperationoftheinternalanalogtodigital converter. TheEOCBbitintheADCRregisterisusedtoindicatewhentheanalogtodigitalconversionprocess iscomplete.Thisbitwillbeautomaticallysetto“0”bythemicrocontrollerafteraconversioncycle hasended.Inaddition,thecorrespondingA/Dinterruptrequestflagwillbesetintheinterrupt controlregister,andiftheinterruptsareenabled,anappropriateinternalinterruptsignalwillbe generated.ThisA/DinternalinterruptsignalwilldirecttheprogramflowtotheassociatedA/D internalinterruptaddressforprocessing.IftheA/Dinternalinterruptisdisabled,themicrocontroller canbeusedtopolltheEOCBbitintheADCRregistertocheckwhetherithasbeenclearedasan alternativemethodofdetectingtheendofanA/Dconversioncycle. TheclocksourcefortheA/Dconverter,whichoriginatesfromthesystemclockfSYS,canbechosen tobeeitherfSYSorasubdividedversionoffSYSThedivisionratiovalueisdeterminedbythe ADCK2~ADCK0bitsintheACSRregister. Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe ADOFFbitintheADCRregister.ThisbitmustbezerotopowerontheA/Dconverter.Whenthe ADOFFbitisclearedtozerotopowerontheA/Dconverterinternalcircuitryacertaindelay,as indicatedinthetimingdiagram,mustbeallowedbeforeanA/Dconversionisinitiated.Evenifno pinsareselectedforuseasA/DinputsbyclearingthePCR3~PCR0bitsintheANCSRregisters,if theADOFFbitiszerothensomepowerwillstillbeconsumed.Inpowerconsciousapplicationsit isthereforerecommendedthattheADOFFissethightoreducepowerconsumptionwhentheA/D converterfunctionisnotbeingused. ThereferencevoltagesupplytotheA/DConvertercanbesuppliedfromeitherthepositivepower supplypin,VDD,orfromanexternalreferencesourcessuppliedonpinVREF.Thedesiredselection ismadeusingtheVREFSbit.AstheVREFpinispin-sharedwithotherfunctions,whentheVREFS bitissethigh,theVREFpinfunctionwillbeselectedandtheotherpinfunctionswillbedisabled automatically. Conversion Accumulation Mode EachsingleA/Dconversionoperationprovidesa12-bitwidedigitalconversionvalue.IftheACCM bitiszerothenonlyasingleA/Dconversionprocesswilltakeplace.HoweveriftheACCMbit issethighthentheA/Dconverterwillbeintheconversionaccumulationmode.Inthismode, 16repetitiveA/Dconversionoperationsaremadewitheachnewconvertedvaluebeingaddedto thepreviousaccumulatedvalue.Afterthe16conversionvalues,eachof12-bitsinlength,have completedandaddedtogether,aresulting16-bitwidedigitalvalueisobtainedandstoredinthetwo A/Ddataregisters.Howeveritmustbenotedthat,althoughtheaccumulatedresultprovidesafull 16-bitvalue,onlythe13higherbits,16bitswillbevalid.WheninthismodetheEOCBbitwillbe clearedtozeroafter16conversionoperationshavecompleted. |
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