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HT45FM2C bảng dữ liệu(PDF) 94 Page - Holtek Semiconductor Inc |
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HT45FM2C bảng dữ liệu(HTML) 94 Page - Holtek Semiconductor Inc |
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94 / 171 page  Rev. 1.10 94 �a� �0� �01� Rev. 1.10 95 �a� �0� �01� HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU Preliminar� registercanbepolled.Theconversionprocessiscompletewhenthisbitgoeslow.Whenthis occurstheA/DdataregisterADRLandADRHcanbereadtoobtaintheconversionvalue.Asan alternativemethod,iftheinterruptsareenabledandthestackisnotfull,theprogramcanwaitfor anA/Dinterrupttooccur. Note:Whencheckingfortheendoftheconversionprocess,ifthemethodofpollingtheEOCB bitintheADCR0registerisused,theinterruptenablestepabovecanbeomitted. Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe A/Dconversionis16tADCKwheretADCKisequaltotheA/Dclockperiod. 0 1 2 3 4 10 11 12 Tdeoc ADCLK START EOCB D[5:0] Tdout ADON Tckl Tckh Tadc k Tst Tstart Ton 000H Toff A/D Conversion Timing Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then thismayleadtosomeincreaseinpowerconsumption. A/D Transfer Function Asthedevicecontainsa10-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto 3FFH.Sincethefull-scaleanaloginputvalueisequaltotheVDDvoltage,thisgivesasinglebit analoginputvalueofVDDdividedby4096. 1LSB=VDD ÷ 4096 TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation: A/Dinputvoltage=A/Doutputdigitalvalue×VDD ÷ 4096 Thediagramshowstheidealtransferfunctionbetweentheanaloginputvalueandthedigitised outputvaluefortheA/Dconverter.Exceptforthedigitisedzerovalue,thesubsequentdigitised valueswillchangeatapoint0.5LSBbelowwheretheywouldchangewithouttheoffset,andthe lastfullscaledigitisedvaluewillchangeatapoint1.5LSBbelowtheVDDlevel. |
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