HT66F005 datasheet(87/109 Pages) HOLTEK

87 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

External Interrupt

TheexternalinterruptiscontrolledbysignaltransitionsontheINTpin.Anexternalinterrupt

requestwilltakeplacewhentheexternalinterruptrequestflag,INTF,isset,whichwilloccurwhen

atransition,whosetypeischosenbytheedgeselectbits,appearsontheexternalinterruptpin.To

allowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenablebit,

EMI,andrespectiveexternalinterruptenablebit,INTE,mustfirstbeset.Additionallythecorrect

interruptedgetypemustbeselectedusingtheINTEGregistertoenabletheexternalinterrupt

functionandtochoosethetriggeredgetype.Astheexternalinterruptpinispin-sharedwithanI/

Opin,itcanonlybeconfiguredasanexternalinterruptpinifitsexternalinterruptenablebitinthe

correspondinginterruptregisterhasbeenset.Thepinmustalsobesetupasaninputbysettingthe

correspondingbitintheportcontrolregister.Whentheinterruptisenabled,thestackisnotfull

andthecorrecttransitiontypeappearsontheexternalinterruptpin,asubroutinecalltotheexternal

interruptvector,willtakeplace.Whentheinterruptisserviced,theexternalinterruptrequestflags,

INTF,willbeautomaticallyresetandtheEMIbitwillbeautomaticallyclearedtodisableother

interrupts.Notethatanypull-highresistorselectionontheexternalinterruptpinwillremainvalid

evenifthepinisusedasanexternalinterruptinput.

TheINTEGregisterisusedtoselectthetypeofactiveedgethatwilltriggertheexternalinterrupt.

Achoiceofeitherrisingorfallingorbothedgetypescanbechosentotriggeranexternalinterrupt.

NotethattheINTEGregistercanalsobeusedtodisabletheexternalinterruptfunction.

Multi-function Interrupt

WithinthesedevicestherearetwoMulti-functioninterrupts.Unliketheotherindependentinterrupts,

theseinterruptshavenoindependentsource,butratherareformedfromotherexistinginterrupt

sources,namelytheTMInterrupts.

AMulti-functioninterruptrequestwilltakeplacewhenanyoftheMulti-functioninterruptrequest

flags,MFnFareset.TheMulti-functioninterruptflagswillbesetwhenanyoftheirincluded

functionsgenerateaninterruptrequestflag.Toallowtheprogramtobranchtoitsrespectiveinterrupt

vectoraddress,whentheMulti-functioninterruptisenabledandthestackisnotfull,andeitherone

oftheinterruptscontainedwithineachofMulti-functioninterruptoccurs,asubroutinecalltooneof

theMulti-functioninterruptvectorswilltakeplace.Whentheinterruptisserviced,therelatedMulti-

Functionrequestflag,willbeautomaticallyresetandtheEMIbitwillbeautomaticallyclearedto

disableotherinterrupts.

However,itmustbenotedthat,althoughtheMulti-functionInterruptflagswillbeautomatically

resetwhentheinterruptisserviced,therequestflagsfromtheoriginalsourceoftheMulti-function

interrupts,namelytheTMInterrupts,willnotbeautomaticallyresetandmustbemanuallyresetby

theapplicationprogram.

A/D Converter Interrupt

ThedevicescontainanA/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.

TheEMIbitwillalsobeautomaticallyclearedtodisableotherinterrupts.

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