HT45F3W datasheet(128/167 Pages) HOLTEK

128 / 167 page

Rev. 1.50

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Rev. 1.50

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HT45F3W

R-Type Blood Pressure Meter Flash MCU

HT45F3W

R-Type Blood Pressure Meter Flash MCU

A/D Converter Interrupt

ThedevicecontainsanA/Dconverterwhichhasitsownindependentinterrupt.TheA/DConverter

InterruptiscontrolledbytheterminationofanA/Dconversionprocess.AnA/DConverterInterrupt

requestwilltakeplacewhentheA/DConverterInterruptrequestflag,ADF,isset,whichoccurs

whentheA/Dconversionprocessfinishes.Toallowtheprogramtobranchtoitsrespectiveinterrupt

vectoraddress,theglobalinterruptenablebit,EMI,andA/DInterruptenablebit,ADE,mustfirstbe

set.Whentheinterruptisenabled,thestackisnotfullandtheA/Dconversionprocesshasended,a

subroutinecalltotheA/DConverterInterruptvector,willtakeplace.Whentheinterruptisserviced,

theA/DConverterInterruptflag,ADF,willbeautomaticallycleared.TheEMIbitwillalsobe

automaticallyclearedtodisableotherinterrupts.

Multi-function Interrupt

WithinthisdevicetherearefiveMulti-functioninterrupts.Unliketheotherindependentinterrupts,

theseinterruptshavenoindependentsource,butratherareformedfromotherexistinginterrupt

sources.

AMulti-functioninterruptrequestwilltakeplacetheMulti-functioninterruptrequestflag,MFnF

isset.TheMulti-functioninterruptflagwillbesetwhenanyofitsincludedfunctionsgeneratean

interruptrequestflag.Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,

whentheMulti-functioninterruptisenabledandthestackisnotfull,andeitheroneoftheinterrupts

containedwithineachofMulti-functioninterruptoccurs,asubroutinecalltotheMulti-function

interruptvectorwilltakeplace.Whentheinterruptisserviced,therelatedMulti-Functionrequest

flag,willbeautomaticallyresetandtheEMIbitwillbeautomaticallyclearedtodisableother

interrupts.

However,itmustbenotedthat,althoughtheMulti-functionInterruptflagswillbeautomatically

resetwhentheinterruptisserviced,therequestflagsfromtheoriginalsourceoftheMulti-

functioninterrupts,namelytheTMInterrupt,LVDInterrupt,EEPROMInterrupt,Time-base

Interrupt,external1interrupt,SPIninterrupts,SCFinterruptandChargePumpinterruptwillnotbe

automaticallyresetandmustbemanuallyresetbytheapplicationprogram.

Time Base Interrupt

TheTime-baseInterrupt,iscontainedwithintheMulti-functionInterrupt.Thefunctionofthe

TimeBaseInterruptsistoprovideregulartimesignalintheformofaninternalinterrupt.They

arecontrolledbytheoverflowsignalsfromtheirrespectivetimerfunctions.Whenthesehappens

theirrespectiveinterruptrequestflags,TB0ForTB1Fwillbeset.Toallowtheprogramtobranch

totheirrespectiveinterruptvectoraddresses,theglobalinterruptenablebit,EMI,multi-function

enablebit,MFnEandTimeBaseenablebits,TB0EorTB1E,mustfirstbeset.Whentheinterrupt

isenabled,thestackisnotfullandtheTimeBaseoverflows,asubroutinecalltotheirrespective

vectorlocationswilltakeplace.Whentheinterruptisserviced,theEMIbitwillbeautomatically

clearedtodisableotherinterrupts,howeveronlytheMulti-functioninterruptrequestflagwillbe

alsoautomaticallycleared.AstheTBnFflagwillnotbeautomaticallycleared,ithastobecleared

bytheapplicationprogram.

ThepurposeoftheTimeBaseInterruptistoprovideaninterruptsignalatfixedtimeperiods.Their

clocksourcesoriginatefromtheinternalclocksourcefTB.ThisfTBinputclockpassesthrougha

divider,thedivisionratioofwhichisselectedbyprogrammingtheappropriatebitsintheTBC

registertoobtainlongerinterruptperiodswhosevalueranges.TheclocksourcethatgeneratesfTB,

whichinturncontrolstheTimeBaseinterruptperiod,canoriginatefromseveraldifferentsources,

asshownintheSystemOperatingModesection.

HT45F3W Datasheet(PDF) 128 Page - Holtek Semiconductor Inc

HT45F3W Datasheet(HTML) 128 Page - Holtek Semiconductor Inc

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