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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT45F5Q bảng dữ liệu(PDF) 31 Page - Holtek Semiconductor Inc |
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HT45F5Q bảng dữ liệu(HTML) 31 Page - Holtek Semiconductor Inc |
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31 / 114 page  Rev. 1.10 �0 De�e��e� 1�� �01� Rev. 1.10 �1 De�e��e� 1�� �01� HT45F5Q Charger Flash MCU HT45F5Q Charger Flash MCU Reading Data from the EEPROM ToreaddatafromtheEEPROM,thereadenablebit,RDEN,intheEECregistermustfirstbeset hightoenablethereadfunction.TheEEPROMaddressofthedatatobereadmustthenbeplaced intheEEAregister.IftheRDbitintheEECregisterisnowsethigh,areadcyclewillbeinitiated. SettingtheRDbithighwillnotinitiateareadoperationiftheRDENbithasnotbeenset.When thereadcycleterminates,theRDbitwillbeautomaticallyclearedtozero,afterwhichthedatacan bereadfromtheEEDregister.ThedatawillremainintheEEDregisteruntilanotherreadorwrite operationisexecuted.TheapplicationprogramcanpolltheRDbittodeterminewhenthedatais validforreading. Writing Data to the EEPROM TheEEPROMaddressofthedatatobewrittenmustfirstbeplacedintheEEAregisterandthedata placedintheEEDregister.TowritedatatotheEEPROM,thewriteenablebit,WREN,intheEEC registermustfirstbesethightoenablethewritefunction.Afterthis,theWRbitintheEECregister mustbeimmediatelysethightoinitiateawritecycle.Thesetwoinstructionsmustbeexecuted consecutively.TheglobalinterruptbitEMIshouldalsofirstbeclearedbeforeimplementingany writeoperations,andthensetagainafterthewritecyclehasstarted.NotethatsettingtheWRbit highwillnotinitiateawritecycleiftheWRENbithasnotbeenset.AstheEEPROMwritecycleis controlledusinganinternaltimerwhoseoperationisasynchronoustomicrocontrollersystemclock, acertaintimewillelapsebeforethedatawillhavebeenwrittenintotheEEPROM.Detectingwhen thewritecyclehasfinishedcanbeimplementedeitherbypollingtheWRbitintheEECregisteror byusingtheEEPROMinterrupt.Whenthewritecycleterminates,theWRbitwillbeautomatically clearedtozerobythemicrocontroller,informingtheuserthatthedatahasbeenwrittentothe EEPROM.TheapplicationprogramcanthereforepolltheWRbittodeterminewhenthewritecycle hasended. Write Protection Protectionagainstinadvertentwriteoperationisprovidedinseveralways.Afterthedeviceis powered-ontheWriteEnablebitinthecontrolregisterwillbeclearedpreventinganywrite operations.Alsoatpower-ontheBankPointer,BP,willberesettozero,whichmeansthatData MemoryBank0willbeselected.AstheEEPROMcontrolregisterislocatedinBank1,thisaddsa furthermeasureofprotectionagainstspuriouswriteoperations.Duringnormalprogramoperation, ensuringthattheWriteEnablebitinthecontrolregisterisclearedwillsafeguardagainstincorrect writeoperations. EEPROM Interrupt TheEEPROMwriteinterruptisgeneratedwhenanEEPROMwritecyclehasended.TheEEPROM interruptmustfirstbeenabledbysettingtheDEEbitintherelevantinterruptregister.Whenan EEPROMwritecycleends,theDEFrequestflagwillbeset.Iftheglobal,EEPROMInterruptare enabledandthestackisnotfull,asubroutinecalltotheEEPROMInterruptvector,willtakeplace. WhentheEEPROMInterruptisserviced,theEEPROMInterruptflagDEFwillbeautomatically cleared.TheEMIbitwillalsobeautomaticallyclearedtodisableotherinterrupts. |
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