HT66F019 datasheet(35/175 Pages) HOLTEK

35 / 175 page

Rev. 1.00

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Rev. 1.00

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HT66F019

A/D Flash MCU with EEPROM

HT66F019

A/D Flash MCU with EEPROM

Programming Considerations

CaremustbetakenthatdataisnotinadvertentlywrittentotheEEPROM.Protectioncanbe

enhancedbyensuringthattheWriteEnablebitisnormallyclearedtozerowhennotwriting.Also

theBankPointercouldbenormallyclearedtozeroasthiswouldinhibitaccesstoBank1where

theEEPROMcontrolregisterexist.Althoughcertainlynotnecessary,considerationmightbegiven

intheapplicationprogramtothecheckingofthevalidityofnewwritedatabyasimplereadback

process.

WhenwritingdatatheWRbitmustbesethighimmediatelyaftertheWRENbithasbeensethigh,

toensurethewritecycleexecutescorrectly.TheglobalinterruptbitEMIshouldalsobecleared

beforeawritecycleisexecutedandthenre-enabledafterthewritecyclestarts.Notethatthedevice

shouldnotentertheIDLEorSLEEPmodeuntiltheEEPROMreadorwriteoperationistotally

complete.Otherwise,theEEPROMreadorwriteoperationwillfail.

Programming Examples

Reading data from the EEPROM – polling method

MOV A,EEPROM_ADRES;userdefinedaddress

MOV EEA,A

MOV A,040H;setupmemorypointerMP1

MOV MP1,A;MP1pointstoEECregister

MOV A,01H;setupBankPointer

MOV BP,A

SET IAR1.1;setRDENbit,enablereadoperations

SET IAR1.0;startReadCycle-setRDbit

BACK:

SZ IAR1.0;checkforreadcycleend

JMP BACK

CLR IAR1 ;disableEEPROMread/write

CLR BP

MOV A,EED;movereaddatatoregister

MOV READ_DATA,A

Writing Data to the EEPROM – polling method

MOV A,EEPROM_ADRES;userdefinedaddress

MOV EEA,A

MOV A,EEPROM_DATA;userdefineddata

MOV EED,A

MOV A,040H;setupmemorypointerMP1

MOV MP1,A;MP1pointstoEECregister

MOV A,01H;setupBankPointer

MOV BP,A

CLR EMI

SET IAR1.3;setWRENbit,enablewriteoperations

SET IAR1.2;startWriteCycle-setWRbit– executed immediately

;aftersetWRENbit

SET EMI

BACK:

SZ IAR1.2;checkforwritecycleend

JMP BACK

CLR IAR1 ;disableEEPROMread/write

CLR BP

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