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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT67F488 데이터시트(PDF) 35 Page - Holtek Semiconductor Inc |
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HT67F488 데이터시트(HTML) 35 Page - Holtek Semiconductor Inc |
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35 / 171 page  Rev. 1.60 35 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & 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 TheEEPROMaddressofthedatatobewrittenmustfirstbeplacedintheEEAregisterandthedata placedintheEEDregister.TowritedatatotheEEPROM,thewriteenablebit,WREN,intheEEC registermustfirstbesethightoenablethewritefunction.Afterthis,theWRbitintheEECregister mustbeimmediatelysethightoinitiateawritecycle.Thesetwoinstructionsmustbeexecuted consecutively.TheglobalinterruptbitEMIshouldalsofirstbeclearedbeforeimplementingany writeoperations,andthensetagainafterthewritecyclehasstarted.SettingtheWRbithighwillnot initiateawritecycleiftheWRENbithasnotbeenset.AstheEEPROMwritecycleiscontrolled usinganinternaltimerwhoseoperationisasynchronoustomicrocontrollersystemclock,acertain timewillelapsebeforethedatawillhavebeenwrittenintotheEEPROM.Detectingwhenthewrite cyclehasfinishedcanbeimplementedeitherbypollingtheWRbitintheEECregisterorbyusing theEEPROMinterrupt.Whenthewritecycleterminates,theWRbitwillbeautomaticallycleared tozerobythemicrocontroller,informingtheuserthatthedatahasbeenwrittentotheEEPROM. TheapplicationprogramcanthereforepolltheWRbittodeterminewhenthewritecyclehasended. Write Protection Protectionagainstinadvertentwriteoperationisprovidedinseveralways.Afterthedeviceis powered-ontheWriteEnablebitinthecontrolregisterwillbeclearedpreventinganywrite operations.Alsoatpower-onMP1L/MP1HandMP2L/MP2Hwillberesettozero,whichmeans thatDataMemorySector0willbeselected.AstheEEPROMcontrolregisterislocatedinSector1, thisaddsafurthermeasureofprotectionagainstspuriouswriteoperations.Duringnormalprogram operation,ensuringthattheWriteEnablebitinthecontrolregisterisclearedwillsafeguardagainst incorrectwriteoperations. EEPROM Interrupt TheEEPROMwriteinterruptisgeneratedwhenanEEPROMwritecyclehasended.TheEEPROM interruptmustfirstbeenabledbysettingtheDEEbitintherelevantinterruptregister.Howeveras theEEPROMiscontainedwithinaMulti-functionInterrupt,theassociatedmulti-functioninterrupt enablebitmustalsobeset.WhenanEEPROMwritecycleends,theDEFrequestflagandits associatedmulti-functioninterruptrequestflagwillbothbeset.Iftheglobal,EEPROMandMulti- functioninterruptsareenabledandthestackisnotfull,ajumptotheassociatedMulti-function Interruptvectorwilltakeplace.WhentheinterruptisservicedonlytheMulti-functioninterruptflag willbeautomaticallyreset,theEEPROMinterruptflagmustbemanuallyresetbytheapplication program.MoredetailscanbeobtainedintheInterruptsection. |
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