HT66F302 datasheet(32/129 Pages) HOLTEK

32 / 129 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT66F302/HT66F303

Cost-Effective Flash MCU with EEPROM

HT66F302/HT66F303

Cost-Effective Flash MCU with EEPROM

Programming Considerations

CaremustbetakenthatdataisnotinadvertentlywrittentotheEEPROM.ProtectioncanbePeriodic

byensuringthattheWriteEnablebitisnormallyclearedtozerowhennotwriting.AlsotheBank

PointercouldbenormallyclearedtozeroasthiswouldinhibitaccesstoBank1wheretheEEPROM

controlregisterexist.Althoughcertainlynotnecessary,considerationmightbegiveninthe

applicationprogramtothecheckingofthevalidityofnewwritedatabyasimplereadbackprocess.

WhenwritingdatatheWRbitmustbesethighimmediatelyaftertheWRENbithasbeensethigh,

toensurethewritecycleexecutescorrectly.TheglobalinterruptbitEMIshouldalsobecleared

beforeawritecycleisexecutedandthenre-enabledafterthewritecyclestarts.Notethatthedevice

shouldnotentertheIDLEorSLEEPmodeuntiltheEEPROMreadorwriteoperationistotally

complete.Otherwise,theEEPROMreadorwriteoperationwillfail.

Programming Examples

Reading data from the EEPROM – polling method

MOVA,EEPROM_ADRES ;userdefinedaddress

MOVEEA,A

MOVA,040H;setupmemorypointerMP1

MOVMP1,A;MP1pointstoEECregister

MOVA,01H ;setupBankPointer

MOVBP,A

SETIAR1.1;setRDENbit,enablereadoperations

SETIAR1.0 ;startReadCycle-setRDbit

BACK:

SZIAR1.0;checkforreadcycleend

JMPBACK

CLRIAR1;disableEEPROMwrite

CLRBP

MOVA,EED;movereaddatatoregister

MOVREAD_DATA,A

Writing Data to the EEPROM – polling method

MOVA,EEPROM_ADRES ;userdefinedaddress

MOVEEA,A

MOVA,EEPROM_DATA ;userdefineddata

MOVEED,A

MOVA,040H;setupmemorypointerMP1

MOVMP1,A;MP1pointstoEECregister

MOVA,01H ;setupBankPointer

MOVBP,A

CLREMI

SETIAR1.3;setWRENbit,enablewriteoperations

SETIAR1.2;startWriteCycle-setWRbit–executedimmediatelyafter

;setWRENbit

SETEMI

BACK:

SZIAR1.2;checkforwritecycleend

JMPBACK

CLRIAR1;disableEEPROMwrite

CLRBP

HT66F302 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

HT66F302 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc

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