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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F65 데이터시트(PDF) 44 Page - Holtek Semiconductor Inc |
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HT45F65 데이터시트(HTML) 44 Page - Holtek Semiconductor Inc |
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44 / 231 page  Rev. 1.60 �� �ove��e� ��� �01� Rev. 1.60 �� �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Bit1 AC:Auxiliaryflag 0:noauxiliarycarry 1:anoperationresultsinacarryoutofthelownibblesinaddition,ornoborrowfrom thehighnibbleintothelownibbleinsubtraction Bit0 C:Carryflag 0:nocarry-out 1:anoperationresultsinacarryduringanadditionoperationorifaborrowdoesnot takeplaceduringasubtractionoperation Cisalsoaffectedbyarotatethroughcarryinstruction. Oscillator Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Externaloscillatorsrequiringsomeexternal componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents, areprovidedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillatoroptions areselectedthroughtheconfigurationoptions.Thehigherfrequencyoscillatorsprovidehigher performancebutcarrywithitthedisadvantageofhigherpowerrequirements,whiletheopposite isofcoursetrueforthelowerfrequencyoscillators.Withthecapabilityofdynamicallyswitching betweenfastandslowsystemclock,thedevicehastheflexibilitytooptimizetheperformance/ powerratio,afeatureespeciallyimportantinpowersensitiveportableapplications. Type Name Freq. Pins Exte�nal C�ystal HXT �00kHz~�0MHz OSC1/OSC� Exte�nal RC ERC 8MHz OSC1 Inte�nal High Speed RC HIRC �� 8 o� 1�MHz — Exte�nal Low Speed C�ystal LXT 3�.768kHz XT1/XT� Inte�nal Low Speed RC LIRC 3�kHz — Note:TheexternalRCoscillatoronlyexistsintheHT45F66/HT45F67. Oscillator Types System Clock Configurations Therearefivemethodsofgeneratingthesystemclock,threehighspeedoscillatorsandtwolow speedoscillators.Thehighspeedoscillatorsaretheexternalcrystal/ceramicoscillator,externalRC oscillatorandtheinternal4MHz,8MHzor12MHzRCoscillator.Thetwolowspeedoscillatorsare theinternal32kHzRCoscillatorandtheexternal32.768kHzcrystaloscillator.Selectingwhetherthe loworhighspeedoscillatorisusedasthesystemoscillatorisimplementedusingtheHLCLKbit andCKS2~CKS0bitsintheSMOD0registerandasthesystemclockcanbedynamicallyselected. Theactualsourceclockusedforeachofthehighspeedandlowspeedoscillatorsischosen viaconfigurationoptions.Thefrequencyoftheslowspeedorhighspeedsystemclockisalso determinedusingtheHLCLKbitandCKS2~CKS0bitsintheSMOD0register.Notethattwo oscillatorselectionsmustbemadenamelyonehighspeedandonelowspeedsystemoscillators.Itis notpossibletochooseano-oscillatorselectionforeitherthehighorlowspeedoscillator. |
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