HT67F5652 datasheet(178/224 Pages) HOLTEK

178 / 224 page

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HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

External Interrupt

TheexternalinterruptsarecontrolledbysignaltransitionsonthepinsINT0~INT3.Anexternal

interruptrequestwilltakeplacewhentheexternalinterruptrequestflags,INT0F~INT3F,areset,

whichwilloccurwhenatransition,whosetypeischosenbytheedgeselectbits,appearsonthe

externalinterruptpins.Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,the

globalinterruptenablebit,EMI,andrespectiveexternalinterruptenablebit,INT0E~INT3E,must

firstbeset.AdditionallythecorrectinterruptedgetypemustbeselectedusingtheINTEGregisterto

enabletheexternalinterruptfunctionandtochoosethetriggeredgetype.Astheexternalinterrupt

pinsarepin-sharedwithI/Opins,theycanonlybeconfiguredasexternalinterruptpinsiftheir

externalinterruptenablebitinthecorrespondinginterruptregisterhasbeenset.Thepinmustalso

besetupasaninputbysettingthecorrespondingbitintheportcontrolregister.Whentheinterrupt

isenabled,thestackisnotfullandthecorrecttransitiontypeappearsontheexternalinterruptpin,

asubroutinecalltotheexternalinterruptvector,willtakeplace.Whentheinterruptisserviced,the

externalinterruptrequestflags,INT0F~INT3F,willbeautomaticallyresetandtheEMIbitwillbe

automaticallyclearedtodisableotherinterrupts.Notethatanypull-highresistorselectionsonthe

externalinterruptpinswillremainvalidevenifthepinisusedasanexternalinterruptinput.The

INTEGregisterisusedtoselectthetypeofactiveedgethatwilltriggertheexternalinterrupt.A

choiceofeitherrisingorfallingorbothedgetypescanbechosentotriggeranexternalinterrupt.

NotethattheINTEGregistercanalsobeusedtodisabletheexternalinterruptfunction.

Comparator Interrupt

Thecomparatorinterruptsarecontrolledbythetwointernalcomparators.Acomparatorinterrupt

requestwilltakeplacewhenthecomparatorinterruptrequestflags,CP0ForCP1F,areset,a

situationthatwilloccurwhenthecomparatoroutputCnOUTbitchangesstate.Toallowthe

programtobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenablebit,EMI,

andcomparatorinterruptenablebits,CP0EandCP1E,mustfirstbeset.Whentheinterruptis

enabled,thestackisnotfullandthecomparatorinputsgenerateacomparatoroutputtransition,a

subroutinecalltothecomparatorinterruptvector,willtakeplace.Whentheinterruptisserviced,the

comparatorinterruptrequestflagswillbeautomaticallyresetandtheEMIbitwillbeautomatically

clearedtodisableotherinterrupts.

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.

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