HT66F4530 datasheet(49/224 Pages) HOLTEK

49 / 224 page

Rev. 1.00

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Rev. 1.00

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HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

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.Afterthesedevices

arepowered-ontheWriteEnablebitinthecontrolregisterwillbeclearedpreventinganywrite

operations.Alsoatpower-ontheMemoryPointerhighbyteregister,MP1HorMP2H,willbereset

tozero,whichmeansthatDataMemorySector0willbeselected.AstheEEPROMcontrolregister

islocatedinSector1,thisaddsafurthermeasureofprotectionagainstspuriouswriteoperations.

Duringnormalprogramoperation,ensuringthattheWriteEnablebitinthecontrolregisteris

clearedwillsafeguardagainstincorrectwriteoperations.

EEPROM Interrupt

TheEEPROMwriteinterruptisgeneratedwhenanEEPROMwritecyclehasended.TheEEPROM

interruptmustfirstbeenabledbysettingtheDEEbitintherelevantinterruptregister.Whenan

EEPROMwritecycleends,theDEFrequestflagwillbeset.Iftheglobal,EEPROMinterruptsare

enabledandthestackisnotfull,ajumptotheassociatedEEPROMInterruptvectorwilltakeplace.

Whentheinterruptisserviced,theEEPROMInterruptflag,DEF,willbeautomaticallycleared.The

EMIbitwillalsobeautomaticallyclearedtodisableotherinterrupts.Moredetailscanbeobtained

intheInterruptsection.

HT66F4530 Datasheet(PDF) 49 Page - Holtek Semiconductor Inc

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