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HT45F3230 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc |
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HT45F3230 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc |
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32 / 148 page  Rev. 1.00 32 January 13, 2017 Rev. 1.00 33 January 13, 2017 HT45F3230 IR Sensing/Motor Driving Flash MCU HT45F3230 IR Sensing/Motor Driving 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 TowritedatatotheEEPROM,theEEPROMaddressofthedatatobewrittenmustfirstbeplaced intheEEAregisterandthedataplacedintheEEDregister.Thenthewriteenablebit,WREN, intheEECregistermustfirstbesethightoenablethewritefunction.Afterthis,theWRbitin theEECregistermustbeimmediatelysethightoinitiateawritecycle.Thesetwoinstructions mustbeexecutedconsecutively.TheglobalinterruptbitEMIshouldalsofirstbeclearedbefore implementinganywriteoperations,andthensetagainafterthewritecyclehasstarted.Notethat settingtheWRbithighwillnotinitiateawritecycleiftheWRENbithasnotbeenset.Asthe EEPROMwritecycleiscontrolledusinganinternaltimerwhoseoperationisasynchronousto microcontrollersystemclock,acertaintimewillelapsebeforethedatawillhavebeenwritteninto theEEPROM.Detectingwhenthewritecyclehasfinishedcanbeimplementedeitherbypollingthe WRbitintheEECregisterorbyusingtheEEPROMinterrupt.Whenthewritecycleterminates, theWRbitwillbeautomaticallyclearedtozerobythemicrocontroller,informingtheuserthatthe datahasbeenwrittentotheEEPROM.TheapplicationprogramcanthereforepolltheWRbitto determinewhenthewritecyclehasended. Write Protection Protectionagainstinadvertentwriteoperationisprovidedinseveralways.Afterthedeviceis powered-ontheWriteEnablebitinthecontrolregisterwillbeclearedpreventinganywrite operations.Alsoatpower-ontheBankPointer,BP,willberesettozero,whichmeansthatData MemoryBank0willbeselected.AstheEEPROMcontrolregisterislocatedinBank1,thisaddsa furthermeasureofprotectionagainstspuriouswriteoperations.Duringnormalprogramoperation, ensuringthattheWriteEnablebitinthecontrolregisterisclearedwillsafeguardagainstincorrect writeoperations. EEPROM Interrupt TheEEPROMwriteinterruptisgeneratedwhenanEEPROMwritecyclehasended.TheEEPROM interruptmustfirstbeenabledbysettingtheEPWEbitintherelevantinterruptregister.Whenan EEPROMwritecycleends,theEPWFrequestflagwillbeset.IftheEEPROMinterruptisenabled andthestackisnotfull,ajumptotheassociatedEEPROMInterruptvectorwilltakeplace.When theinterruptisserviced,theEEPROMinterruptrequestflag,EPWF,willbeautomaticallyresetand theEMIbitwillbeautomaticallyclearedtodisableotherinterrupts.Moredetailscanbeobtainedin theInterruptsection. |
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