HT66F019 datasheet(152/175 Pages) HOLTEK

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HT66F019

A/D Flash MCU with EEPROM

HT66F019

A/D Flash MCU with EEPROM

External Interrupts

TheexternalinterruptsarecontrolledbysignaltransitionsonthepinsINT0~INT1.Anexternal

interruptrequestwilltakeplacewhentheexternalinterruptrequestflags,INT0F~INT1F,areset,

whichwilloccurwhenatransition,whosetypeischosenbytheedgeselectbits,appearsonthe

externalinterruptpins.Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,the

globalinterruptenablebit,EMI,andrespectiveexternalinterruptenablebit,INT0E~INT1E,must

firstbeset.AdditionallythecorrectinterruptedgetypemustbeselectedusingtheINTEGregisterto

enabletheexternalinterruptfunctionandtochoosethetriggeredgetype.Astheexternalinterrupt

pinsarepin-sharedwithI/Opins,theycanonlybeconfiguredasexternalinterruptpinsiftheir

externalinterruptenablebitinthecorrespondinginterruptregisterhasbeenset.Thepinmustalso

besetupasaninputbysettingthecorrespondingbitintheportcontrolregister.Whentheinterrupt

isenabled,thestackisnotfullandthecorrecttransitiontypeappearsontheexternalinterruptpin,

asubroutinecalltotheexternalinterruptvector,willtakeplace.Whentheinterruptisserviced,the

externalinterruptrequestflags,INT0F~INT1F,willbeautomaticallyresetandtheEMIbitwillbe

automaticallyclearedtodisableotherinterrupts.Notethatanypull-highresistorselectionsonthe

externalinterruptpinswillremainvalidevenifthepinisusedasanexternalinterruptinput.

TheINTEGregisterisusedtoselectthetypeofactiveedgethatwilltriggertheexternalinterrupt.

Achoiceofeitherrisingorfallingorbothedgetypescanbechosentotriggeranexternalinterrupt.

NotethattheINTEGregistercanalsobeusedtodisabletheexternalinterruptfunction.

Comparator Interrupt

Thecomparatorinterruptiscontrolledbytheinternalcomparator.Acomparatorinterruptrequest

willtakeplacewhenthecomparatorinterruptrequestflag,CPF,isset,asituationthatwilloccur

whenthecomparatoroutputbitchangesstate.Toallowtheprogramtobranchtoitsrespective

interruptvectoraddress,theglobalinterruptenablebit,EMI,andcomparatorinterruptenablebit,

CPE,mustfirstbeset.Whentheinterruptisenabled,thestackisnotfullandthecomparatorinputs

generateacomparatoroutputtransition,asubroutinecalltothecomparatorinterruptvector,will

takeplace.Whentheinterruptisserviced,thecomparatorinterruptrequestflagwillbeautomatically

resetandtheEMIbitwillbeautomaticallyclearedtodisableotherinterrupts.

Multi-function Interrupts

WithinthedevicetherearethreeMulti-functioninterrupts.Unliketheotherindependentinterrupts,

theseinterruptshavenoindependentsource,butratherareformedfromotherexistinginterrupt

sources,namelytheTMinterrupts,LVDinterruptandEEPROMwriteoperationinterrupt.

AMulti-functioninterruptrequestwilltakeplacewhenanyoftheMulti-functioninterruptrequest

flagsMFnFareset.TheMulti-functioninterruptflagswillbesetwhenanyoftheirincluded

functionsgenerateaninterruptrequestflag.WhentheMulti-functioninterruptisenabledandthe

stackisnotfull,andeitheroneoftheinterruptscontainedwithineachofMulti-functioninterrupt

occurs,asubroutinecalltooneoftheMulti-functioninterruptvectorswilltakeplace.Whenthe

interruptisserviced,therelatedMulti-functionrequestflagwillbeautomaticallyresetandtheEMI

bitwillbeautomaticallyclearedtodisableotherinterrupts.

However,itmustbenotedthat,althoughtheMulti-functionInterruptrequestflagswillbe

automaticallyresetwhentheinterruptisserviced,therequestflagsfromtheoriginalsourceof

theMulti-functioninterruptswillnotbeautomaticallyresetandmustbemanuallyresetbythe

applicationprogram.

HT66F019 Datasheet(PDF) 152 Page - Holtek Semiconductor Inc

HT66F019 Datasheet(HTML) 152 Page - Holtek Semiconductor Inc

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