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HT45F39 Datasheet(PDF) 70 Page - Holtek Semiconductor Inc |
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HT45F39 Datasheet(HTML) 70 Page - Holtek Semiconductor Inc |
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70 / 102 page  Rev. 1.10 70 July 01, 2016 Rev. 1.10 71 July 01, 2016 HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU • ENVCMP BIT 7 6 5 4 3 2 1 0 NAME EADADJ1 EADADJ0 — — CMPOUT ENVEDGE1 ENVEDGE0 — R/W R/W R/W — — R R/W R/W — POR 0 0 — — 0 0 0 — Bit7~~6 EADADJ1~EADADJ0:Auto-EnvelopeADCSamplephaseadjustment 00:StartstoimplementAuto-EnvelopeADCConversion2*tADsecondsbehindthe STARTsignalactivation 01:StartstoimplementAuto-EnvelopeADCConversion1*tADsecondsbehindthe STARTsignalactivation 10:StartstoimplementAuto-EnvelopeADCConversiononcetheSTARTsignal activation 11:StartstoimplementAuto-EnvelopeADCConversion3*tADsecondsbehindthe STARTsignalactivation Bit5~4 unimplemented,readas0 Bit3 CMPOUT:ComparatorOutput 0:SUM<ComparatorValue 1:SUM>ComparatorValue Bit2~1 ENVEDGE1~ENVEDGE0:Comparatoroutputinterrupttriggeredgeselection 00:PositiveEdge 01:NegativeEdge 10:DualEdge 11:cannotbeused Bit0 unimplemented,readas0 AVPCTRL Register TheAVPCTRLregisterisusedtocontroltheAutoEnvelopProcessunit.TheDnbitisusedtoset uptheDividervalue,accordingtowhethertheUltrasonicsensorfrequencyis40KHzor58KHz.The reasonforthisistoallowtheaccumulatedvaluefromtheAccumulatorbetransformedinto8-bit data.Whena40KHzUltrasonicsensorisimplemented,theaccumulatedvalueshouldbedividedby8. Whena58KHzsensorisimplemented,theaccumulatedvalueshouldbedividedby4. TheKnbitisusedtoselectthenumberofADCconverteddataoutputaccumulatedtimes.Whenthe 40KHzfrequencysensorisselected,astheADCsamplingrateis800Khz,thereare20setsofADC converteddataforafrequencycycle,thenthehalfwavewillhave10setsofADCconverteddata.On theotherhand,whenthe58KHzsensorisselected,thehalfwaveofthe58KHzfrequencywillhave7 setsofADCconverteddata.Therefore,whenthe40KHzsensorisselected,theKnbitmustselect"0"to accumulatetheADCoutputdata10timestogettheaccumulatedweightdataastheComparatorinput. Whenthe58KHzsensorisselected,theKnbitmustselect"1"togettheproperaccumulatedweightdata. TheSUMSELbitisusedtoselectthepathfortheComparatorinput.Whenthisbitissethigh,the ComparatorinputwillbetheADCconverteddata.CareshouldbetakeniftheADCconverteddata outputisatarateof800KHz,thedesignershouldtakecarethisshortdataprocessingtime.When thisbitiscleared"0",theComparatorinputwillselecttheDivideroutput. TheAEVMODbitisusedtoselecttheComparatorreferencedata,fromthedataintheSUMCMP registerorthe10-leveldatainFIFO.WhentheAEVMODbitisclearedlow,theComparator referencedataisselectedasthedataintheSUMCMPregister.Thedesignercantakeadvantage ofthisSUMCMPregistertosetthevariousreferencedataasthecomparatorinput,accordingto differentthresholdrequirementsintheapplication.Whenthisbitissethigh,the10-leveldatainthe FIFOisselectedasthecomparatorinput.Thedesignershouldenterthepreferred10-leveldatato comparewiththeADCconverteddataortheDivideroutputdata,determinedbytheSUMSELbit. AstheComparisonisimplementedbyhardware,thedesignershouldenterthedatafirstbefore startingthisschemeandre-enterthedatawithinatimeof40instructioncycleasthe10-leveldata readoutinterrupttakesplace. |
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