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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT69F360 데이터시트(PDF) 192 Page - Holtek Semiconductor Inc |
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HT69F360 데이터시트(HTML) 192 Page - Holtek Semiconductor Inc |
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192 / 235 page  Rev. 1.30 19� �ove��e� 1�� �01� Rev. 1.30 193 �ove��e� 1�� �01� HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & 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. Low Voltage Detector – LVD EachdevicehasaLowVoltageDetectorfunction,alsoknownasLVD.Thisenablesthedeviceto monitorthepowersupplyvoltage,VDD,andprovidesawarningsignalshoulditfallbelowacertain level.Thisfunctionmaybeespeciallyusefulinbatteryapplicationswherethesupplyvoltagewill graduallyreduceasthebatteryages,asitallowsanearlywarningbatterylowsignaltobegenerated. TheLowVoltageDetectoralsohasthecapabilityofgeneratinganinterruptsignal. LVD Register TheLowVoltageDetectorfunctioniscontrolledusingasingleregisterwiththenameLVDC.Three bitsinthisregister,VLVD2~VLVD0,areusedtoselectoneofeightfixedvoltagesbelowwhich alowvoltageconditionwillbedetermined.AlowvoltageconditionisindicatedwhentheLVDO bitisset.IftheLVDObitislow,thisindicatesthattheVDDvoltageisabovethepresetlowvoltage value.TheLVDENbitisusedtocontroltheoverallon/offfunctionofthelowvoltagedetector. Settingthebithighwillenablethelowvoltagedetector.Clearingthebittozerowillswitchoffthe internallowvoltagedetectorcircuits.Asthelowvoltagedetectorwillconsumeacertainamountof power,itmaybedesirabletoswitchoffthecircuitwhennotinuse,animportantconsiderationin powersensitivebatterypoweredapplications. |
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