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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3W 데이터시트(PDF) 110 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 110 Page - Holtek Semiconductor Inc |
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110 / 167 page  Rev. 1.50 110 De�e��e� 01� �01� Rev. 1.50 111 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe A/Dconversionis16tADwheretADisequaltotheA/Dclockperiod. NotethatwhenintheConversionAccumulationMode,16conversioncycleswillberequiredbefore theEOCBbitisclearedtozero. A/D Single Conversion Mode Timing Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighintheADCR register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepowerirrespective ofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesareusedas normalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,thenthismay leadtosomeincreaseinpowerconsumption. Thepower-onresetconditionoftheA/Dconvertercontrolregisterswillensurethattheshared functionpinsaresetupasA/Dconverterinputs.IfanyoftheA/Dconverterinputpinsaretobeused forfunctions,thentheA/DconvertercontrolregisterbitsmustbeproperlysetuptodisabletheA/D inputconfiguration. A/D Transfer Function Asthedevicecontainsa12-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto FFFH.Sincethefull-scaleanaloginputvalueisequaltotheVDDorVREFvoltage,thisgivesasingle bitanaloginputvalueofVDDorVREFdividedby4096. 1LSB=(VDDorVREF)÷4096 TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation: A/Dinputvoltage=A/Doutputdigitalvalue×(VDDorVREF)÷4096 |
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