HT69F340 datasheet(59/235 Pages) HOLTEK

59 / 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

Programming Considerations

CaremustbetakenthatdataisnotinadvertentlywrittentotheEEPROM.ProtectioncanbePeriodic

byensuringthattheWriteEnablebitisnormallyclearedtozerowhennotwriting.AlsotheMemory

pointerhighbyteregisterscouldbenormallyclearedtozeroasthiswouldinhibitaccesstoSector1

wheretheEEPROMcontrolregisterexist.Althoughcertainlynotnecessary,considerationmightbe

givenintheapplicationprogramtothecheckingofthevalidityofnewwritedatabyasimpleread

backprocess.WhenwritingdatatheWRbitmustbesethighimmediatelyaftertheWRENbithas

beensethigh,toensurethewritecycleexecutescorrectly.TheglobalinterruptbitEMIshouldalso

beclearedbeforeawritecycleisexecutedandthenre-enabledafterthewritecyclestarts.Notethat

thedeviceshouldnotentertheIDLEorSLEEPmodeuntiltheEEPROMreadorwriteoperationis

totallycomplete.Otherwise,theEEPROMreadorwriteoperationwillfail.

Programming Examples

Reading data from the EEPROM - polling method

MOV A,EEPROM_ADRES ;userdefinedaddress

MOV EEA,A

MOV A,40H ;setupmemorypointerMP1L

MOV MP1L,A ;MP1LpointstoEECregister

MOV A,01H ;setupmemorypointerMP1H

MOV MP1H,A

SET IAR1.1 ;setRDENbit,enablereadoperations

SET IAR1.0 ;startReadCycle-setRDbit

BACK:

SZ IAR1.0 ;checkforreadcycleend

JMP BACK

CLR IAR1;disableEEPROMread/write

CLR MP1H

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,40H ;setupmemorypointerMP1L

MOV MP1L,A ;MP1LpointstoEECregister

MOV A,01H ;setupmemorypointerMP1H

MOV MP1H,A

CLR EMI;diableglobalinterrupt

SET IAR1.3 ;setWRENbit,enablewriteoperations

SET IAR1.2 ;startWriteCycle-setWRbit

SET EMI;enableglobalinterrupt

BACK:

SZ IAR1.2 ;checkforwritecycleend

JMP BACK

CLR IAR1;disableEEPROMwrite

CLR MP1H

HT69F340 Datasheet(PDF) 59 Page - Holtek Semiconductor Inc

HT69F340 Datasheet(HTML) 59 Page - Holtek Semiconductor Inc

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