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HT66F019 Datasheet(PDF) 156 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 156 Page - Holtek Semiconductor Inc |
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156 / 175 page  Rev. 1.00 156 De�e��e� 01� �01� Rev. 1.00 15� De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Programming Considerations Bydisablingtherelevantinterruptenablebits,arequestedinterruptcanbepreventedfrombeing serviced,however,onceaninterruptrequestflagisset,itwillremaininthisconditioninthe interruptregisteruntilthecorrespondinginterruptisservicedoruntiltherequestflagisclearedby theapplicationprogram. WhereacertaininterruptiscontainedwithinaMulti-functioninterrupt,thenwhentheinterrupt serviceroutineisexecuted,asonlytheMulti-functioninterruptrequestflags,MFnF,willbe automaticallycleared,theindividualrequestflagforthefunctionneedstobeclearedbythe applicationprogram. Itisrecommendedthatprogramsdonotusethe"CALL"instructionwithintheinterruptservice subroutine.Interruptsoftenoccurinanunpredictablemannerorneedtobeservicedimmediately. Ifonlyonestackisleftandtheinterruptisnotwellcontrolled,theoriginalcontrolsequencewillbe damagedonceaCALLsubroutineisexecutedintheinterruptsubroutine. EveryinterrupthasthecapabilityofwakingupthemicrocontrollerwhenitisinSLEEPorIDLE Mode,thewakeupbeinggeneratedwhentheinterruptrequestflagchangesfromlowtohigh.Ifitis requiredtopreventacertaininterruptfromwakingupthemicrocontrollerthenitsrespectiverequest flagshouldbefirstsethighbeforeenterSLEEPorIDLEMode. AsonlytheProgramCounterispushedontothestack,thenwhentheinterruptisserviced,ifthe contentsoftheaccumulator,statusregisterorotherregistersarealteredbytheinterruptservice program,theircontentsshouldbesavedtothememoryatthebeginningoftheinterruptservice routine. Toreturnfromaninterruptsubroutine,eitheraRETorRETIinstructionmaybeexecuted.TheRETI instructioninadditiontoexecutingareturntothemainprogramalsoautomaticallysetstheEMI bithightoallowfurtherinterrupts.TheRETinstructionhoweveronlyexecutesareturntothemain programleavingtheEMIbitinitspresentzerostateandthereforedisablingtheexecutionoffurther interrupts. |
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