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Rev. 2.50 224 June 22, 2017 Rev. 2.50 225 June 22, 2017

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

A/D Flash MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

A/D Flash MCU with EEPROM

LVD Interrupt

TheLowVoltageDetectorInterruptiscontainedwithintheMulti-functionInterrupt.AnLVD

InterruptrequestwilltakeplacewhentheLVDInterruptrequestflag,LVF,isset,whichoccurs

whentheLowVoltageDetectorfunctiondetectsalowpowersupplyvoltage.Toallowtheprogram

tobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenablebit,EMI,LowVoltage

Interruptenablebit,LVE,andassociatedMulti-functioninterruptenablebit,mustrstbeset.When

theinterruptisenabled,thestackisnotfullandalowvoltageconditionoccurs,asubroutinecallto

theMulti-functionInterruptvector,willtakeplace.WhentheLowVoltageInterruptisserviced,the

EMIbitwillbeautomaticallyclearedtodisableotherinterrupts,howeveronlytheMulti-function

interruptrequestagwillbealsoautomaticallycleared.AstheLVFagwillnotbeautomatically

cleared,ithastobeclearedbytheapplicationprogram.

TM Interrupts

TheCompactandStandardTypeTMshavetwointerruptseach,whiletheEnhancedTypeTMhas

threeinterrupts.AlloftheTMinterruptsarecontainedwithintheMulti-functionInterrupts.Foreach

oftheCompactandStandardTypeTMstherearetwointerruptrequestagsTnPFandTnAFand

twoenablebitsTnPEandTnAE.FortheEnhancedTypeTMtherearethreeinterruptrequestags

TnPF,TnAFandTnBFandthreeenablebitsTnPE,TnAEandTnBE.ATMinterruptrequestwill

takeplacewhenanyoftheTMrequestagsareset,asituationwhichoccurswhenaTMcomparator

P,AorBmatchsituationhappens.

Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,theglobalinterruptenable

bit,EMI,respectiveTMInterruptenablebit,andrelevantMulti-functionInterruptenablebit,MFnE,

mustrstbeset.Whentheinterruptisenabled,thestackisnotfullandaTMcomparatormatch

situationoccurs,asubroutinecalltotherelevantMulti-functionInterruptvectorlocations,willtake

place.WhentheTMinterruptisserviced,theEMIbitwillbeautomaticallyclearedtodisableother

interrupts,howeveronlytherelatedMFnFagwillbeautomaticallycleared.AstheTMinterrupt

requestagswillnotbeautomaticallycleared,theyhavetobeclearedbytheapplicationprogram.

Holtek HT66F30 User Manual

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