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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT66F20 데이터시트(PDF) 49 Page - Holtek Semiconductor Inc |
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HT66F20 데이터시트(HTML) 49 Page - Holtek Semiconductor Inc |
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49 / 298 page  Rev. 1.90 48 �e���a�� 18� �01� Rev. 1.90 49 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM 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.Afterthedeviceis powered-ontheWriteEnablebitinthecontrolregisterwillbeclearedpreventinganywrite operations.Alsoatpower-ontheBankPointer,BP,willberesettozero,whichmeansthatData MemoryBank0willbeselected.AstheEEPROMcontrolregisterislocatedinBank1,thisaddsa furthermeasureofprotectionagainstspuriouswriteoperations.Duringnormalprogramoperation, ensuringthattheWriteEnablebitinthecontrolregisterisclearedwillsafeguardagainstincorrect writeoperations. EEPROM Interrupt TheEEPROMwriteorreadinterruptisgeneratedwhenanEEPROMwriteorreadcyclehas ended.TheEEPROMinterruptmustfirstbeenabledbysettingtheDEEbitintherelevantinterrupt register.HoweverastheEEPROMiscontainedwithinaMulti-functionInterrupt,theassociated multi-functioninterruptenablebitmustalsobeset.WhenanEEPROMwritecycleends,the DEFrequestflaganditsassociatedmulti-functioninterruptrequestflagwillbothbeset.Ifthe global,EEPROMandMulti-functioninterruptsareenabledandthestackisnotfull,ajumpto theassociatedMulti-functionInterruptvectorwilltakeplace.Whentheinterruptisservicedonly theMulti-functioninterruptflagwillbeautomaticallyreset,theEEPROMinterruptflagmustbe manuallyresetbytheapplicationprogram.MoredetailscanbeobtainedintheInterruptsection. |
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