HT45F39 datasheet(84/102 Pages) HOLTEK

84 / 102 page

Rev. 1.10

July 01, 2016

Rev. 1.10

July 01, 2016

HT45F39/HT45F391

Ultrasonic Distance Measurement 8-bit Flash MCU

HT45F39/HT45F391

Ultrasonic Distance Measurement 8-bit Flash MCU

Auto-Envelope Process Comparator Interrupt

TheAuto-EnvelopeProcesscomparatorinterruptiscontrolledbythecomparingresults.The

comparingresultscanbedecidedbytheoptions.WhenthecomparingdataislessthantheSUM

data,thecompareoutputis"1",andwhenthecomparingdataisgreaterthantheSUMdata,the

compareoutputis"0".Thecomparingoutputresultcanbeusedtobethesourcetogeneratean

interrupt,ENVCMPINT.WhentheCMPOUToutputstatuschanges,itsrespectiveinterruptrequest

flag,ENVCMPFwillbeset.Toallowtheprogramtobranchtoitsrespectiveinterruptvector

address,theglobalinterruptenablebitEMIandANPcomparatorinterruptenablebitENVCMPE

mustfirstbeset.

Whentheinterruptisenabled,thestackisnotfullandthecomparatoroutputstatuschanges,a

subroutinecalltotheirrespectivevectorlocationswilltakeplace.Whentheinterruptisserviced,

therespectiveinterruptrequestflagENVCMPFwillbeautomaticallyresetandtheEMIbitwillbe

clearedtodisableotherinterrupts.

TheENVEDGE1andENVEDGE0bitsinENVCMPregisterareusedtoselectthetypeofactive

edgethatwilltriggertheAEPcomparatorinterrupt.Achoiceofeitherrisingorfallingorbothedge

typescanbechosentotriggeraninterrupt.

10-level FIFO Interrupt

Thedevicescontaina10-levelFIFOInterrupt.Whenthe10setsdataarereceivedortransmitted,

therespectiveinterruptrequestflagFIFO10Fwillbeset.Toallowtheprogramtobranchtoits

respectiveinterruptvectoraddress,theglobalinterruptenablebitEMIandthe10-levelFIFO

interruptenablebitFIFO10Emustfirstbeset.Whentheinterruptisenabled,thestackisnotfull

andthe10setsdatareceiveortransmitprocesshasended,asubroutinecalltothe10-levelFIFO

Interruptvector,willtakeplace.Whentheinterruptisserviced,theInterruptflag,FIFO10F,willbe

automaticallycleared.TheEMIbitwillalsobeautomaticallyclearedtodisableotherinterrupts.

A/D Converter Interrupt

TheA/DConverterInterruptiscontrolledbytheterminationofanA/Dconversionprocess.AnA/

DConverterInterruptrequestwilltakeplacewhentheA/DConverterInterruptrequestflag,ADF,

isset,whichoccurswhentheA/Dconversionprocessfinishes.Toallowtheprogramtobranchtoits

respectiveinterruptvectoraddress,theglobalinterruptenablebit,EMI,andA/DInterruptenablebit,

ADE,mustfirstbeset.Whentheinterruptisenabled,thestackisnotfullandtheA/Dconversion

processhasended,asubroutinecalltotheA/DConverterInterruptvector,willtakeplace.Whenthe

interruptisserviced,theA/DConverterInterruptflag,ADF,willbeautomaticallycleared.TheEMI

bitwillalsobeautomaticallyclearedtodisableotherinterrupts.

TM Interrupt

TheCompactTypeTMshavetwointerruptseach.ForeachoftheCompactTypeTMsthereare

twointerruptrequestflags,TPnFandTAnF,andtwoenablebitsTPnEandTAnE.ATMinterrupt

requestwilltakeplacewhenanyoftheTMrequestflagsisset,asituationwhichoccurswhenaTM

comparatorPorAmatchsituationhappens.

Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenable

bitEMIandrespectiveTMInterruptenablebitmustfirstbeset.Whentheinterruptisenabled,

thestackisnotfullandaTMcomparatormatchsituationoccurs,asubroutinecalltotherelevant

Interruptvectorlocationswilltakeplace.WhentheTMinterruptisserviced,theTMinterrupt

requestflagswillbeautomaticallyclearedandtheEMIbitwillbeautomaticallyclearedtodisable

otherinterrupts.

HT45F39 Datasheet(PDF) 84 Page - Holtek Semiconductor Inc

HT45F39 Datasheet(HTML) 84 Page - Holtek Semiconductor Inc

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