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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT68F005 데이터시트(PDF) 27 Page - Holtek Semiconductor Inc |
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HT68F005 데이터시트(HTML) 27 Page - Holtek Semiconductor Inc |
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27 / 93 page  Rev. 1.00 �6 ��to�e� ��� �01� Rev. 1.00 �7 ��to�e� ��� �01� HT68F005/HT68F006 Enhanced I/O Flash Type MCU HT68F005/HT68F006 Enhanced I/O Flash Type 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 TowritedatatotheEEPROM,thewriteenablebit,WREN,intheEECregistermustfirstbeset hightoenablethewritefunction.TheEEPROMaddressofthedatatobewrittenmustthenbe placedintheEEAregisterandthedataplacedintheEEDregister.IftheWRbitintheEECregister isnowsethigh,aninternalwritecyclewillthenbeinitiated.SettingtheWRbithighwillnotinitiate awritecycleiftheWRENbithasnotbeenset.AstheEEPROMwritecycleiscontrolledusingan internaltimerwhoseoperationisasynchronoustomicrocontrollersystemclock,acertaintimewill elapsebeforethedatawillhavebeenwrittenintotheEEPROM.Detectingwhenthewritecycle hasfinishedcanbeimplementedeitherbypollingtheWRbitintheEECregisterorbyusingthe EEPROMinterrupt.Whenthewritecycleterminates,theWRbitwillbeautomaticallyclearedto zerobythemicrocontroller,informingtheuserthatthedatahasbeenwrittentotheEEPROM.The applicationprogramcanthereforepolltheWRbittodeterminewhenthewritecyclehasended. Write Protection Protectionagainstinadvertentwriteoperationisprovidedinseveralways.Afterthedevices arepowered-ontheWriteEnablebitinthecontrolregisterwillbeclearedpreventinganywrite operations.Alsoatpower-ontheBankPointer,BP,willberesettozero,whichmeanthatData MemoryBank0willbeselected.AstheEEPROMcontrolregisterislocatedinBank1,thisaddsa furthermeasureofprotectionagainstspuriouswriteoperations.Duringnormalprogramoperation, ensuringthattheWriteEnablebitinthecontrolregisterisclearedwillsafeguardagainstincorrect writeoperations. EEPROM Interrupt TheEEPROMwriteorreadinterruptisgeneratedwhenanEEPROMwriteorreadcyclehasended. TheEEPROMinterruptmustfirstbeenabledbysettingtheDEEbitintherelevantinterruptregister. WhenanEEPROMwritecycleends,theDEFrequestflagwillbeset.IftheglobalandEEPROM interruptsareenabledandthestackisnotfull,ajumptotheassociatedInterruptvectorwilltake place.WhentheinterruptisservicedtheEEPROMinterruptflagwillbeautomaticallyreset.More detailscanbeobtainedintheInterruptsection. Programming Considerations CaremustbetakenthatdataisnotinadvertentlywrittentotheEEPROM.Protectioncanbe enhancedbyensuringthattheWriteEnablebitisnormallyclearedtozerowhennotwriting.Also theBankPointercouldbenormallyclearedtozeroasthiswouldinhibitaccesstoBank1where theEEPROMcontrolregisterexist.Althoughcertainlynotnecessary,considerationmightbegiven intheapplicationprogramtothecheckingofthevalidityofnewwritedatabyasimplereadback process. |
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