HT45F5R datasheet(115/138 Pages) HOLTEK

115 / 138 page

Rev. 1.10

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Rev. 1.10

115

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HT45F5R

Charger ASSP Flash MCU

HT45F5R

Charger ASSP Flash MCU

External Interrupt

TheexternalinterruptsarecontrolledbysignaltransitionsonthepinsINT0~INT1.Anexternal

interruptrequestwilltakeplacewhentheexternalinterruptrequestflags,INT0F~INT1F,areset,

whichwilloccurwhenatransition,whosetypeischosenbytheedgeselectbits,appearsonthe

externalinterruptpins.Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,

theglobalinterruptenablebit,EMI,andrespectiveexternalinterruptenablebit,INT0E~INT1E,

mustfirstbeset.AdditionallythecorrectinterruptedgetypemustbeselectedusingtheINTEG

registertoenabletheexternalinterruptfunctionandtochoosethetriggeredgetype.Astheexternal

interruptpinsarepin-sharedwithI/Opins,theycanonlybeconfiguredasexternalinterruptpinsif

theirexternalinterruptenablebitinthecorrespondinginterruptregisterhasbeensetandtheexternal

interruptpinisselectedbythecorrespondingpin-sharedfunctionselectionbits.Thepinmustalso

besetupasaninputbysettingthecorrespondingbitintheportcontrolregister.Whentheinterrupt

isenabled,thestackisnotfullandthecorrecttransitiontypeappearsontheexternalinterruptpin,

asubroutinecalltotheexternalinterruptvector,willtakeplace.Whentheinterruptisserviced,the

externalinterruptrequestflags,INT0F~INT1F,willbeautomaticallyresetandtheEMIbitwillbe

automaticallyclearedtodisableotherinterrupts.Notethatanypull-highresistorselectionsonthe

externalinterruptpinswillremainvalidevenifthepinisusedasanexternalinterruptinput.The

INTEGregisterisusedtoselectthetypeofactiveedgethatwilltriggertheexternalinterrupt.A

choiceofeitherrisingorfallingorbothedgetypescanbechosentotriggeranexternalinterrupt.

NotethattheINTEGregistercanalsobeusedtodisabletheexternalinterruptfunction.

OCVP Interrupt

TheOCVPinterruptiscontrolledbythetwointernalcomparators.AnOCVPinterruptrequestwill

takeplacewhentheOCVPinterruptrequestflag,OCVPF,isset,asituationthatwilloccurwhen

thecomparatorsoutputchangesstate.Toallowtheprogramtobranchtoitsrespectiveinterrupt

vectoraddress,theglobalinterruptenablebit,EMI,andOCVPinterruptenablebit,OCVPE,must

firstbeset.Whentheinterruptisenabled,thestackisnotfullandthecomparatorinputgeneratesa

comparatoroutputtransition,asubroutinecalltotheOCVPinterruptvector,willtakeplace.When

theOCVPInterruptisserviced,theEMIbitwillbeautomaticallyclearedtodisableotherinterrupts,

andtheOCVPinterruptrequestflag,OCVPF,willalsobeautomaticallycleared.

Time Base Interrupts

ThefunctionoftheTimeBaseInterruptsistoprovideregulartimesignalintheformofaninternal

interrupt.Theyarecontrolledbytheoverflowsignalsfromtheirrespectivetimerfunctions.When

thesehappenstheirrespectiveinterruptrequestflags,TB0ForTB1Fwillbeset.Toallowthe

programtobranchtotheirrespectiveinterruptvectoraddresses,theglobalinterruptenablebit,EMI

andTimeBaseenablebits,TB0EorTB1E,mustfirstbeset.Whentheinterruptisenabled,thestack

isnotfullandtheTimeBaseoverflows,asubroutinecalltotheirrespectivevectorlocationswill

takeplace.Whentheinterruptisserviced,therespectiveinterruptrequestflag,TB0ForTB1F,will

beautomaticallyresetandtheEMIbitwillbeclearedtodisableotherinterrupts.

ThepurposeoftheTimeBaseInterruptistoprovideaninterruptsignalatfixedtimeperiods.Their

clocksourcesoriginatefromtheinternalclocksourcefTB.ThisfTBinputclockpassesthrougha

divider,thedivisionratioofwhichisselectedbyprogrammingtheappropriatebitsintheTBC

registertoobtainlongerinterruptperiodswhosevalueranges.TheclocksourcethatgeneratesfTB,

whichinturncontrolstheTimeBaseinterruptperiod,canoriginatefromseveraldifferentsources,

asshownintheSystemOperatingModesection.

HT45F5R Datasheet(PDF) 115 Page - Holtek Semiconductor Inc

HT45F5R Datasheet(HTML) 115 Page - Holtek Semiconductor Inc

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