HT69F360 datasheet(58/235 Pages) HOLTEK

58 / 235 page

Rev. 1.30

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O 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.However,as

theEEPROMiscontainedwithinaMulti-functionInterrupt,theassociatedmulti-functioninterrupt

enablebitmustalsobeset.WhenanEEPROMwritecycleends,theDEFrequestflagandits

associatedmulti-funtioninterruptrequestflagwillbothbeset.Iftheglobal,EEPROMandmulti-

functioninterruptsareenabledandthestackisnotfull,ajumptotheassociatedInterruptvectorwill

takeplace.Whentheinterruptisservicedonlythemulti-functioninterruptflagwillbeautomatically

reset,theEEPROMinterruptflagmustbemanuallyresetbytheapplicationprogram.Moredetails

canbeobtainedintheInterruptsection.

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