HT67F50 datasheet(52/242 Pages) HOLTEK

52 / 242 page

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

Programming Considerations

Care must be taken that data is not inadvertently written to the EEPROM. Protection can be

enhanced by ensuring that the Write Enable bit is normally cleared to zero when not writing. Also

the Bank Pointer could be normally cleared to zero as this would inhibit access to Bank 1 where the

EEPROM control register exist. Although certainly not necessary, consideration might be given in

the application program to the checking of the validity of new write data by a simple read back

process.

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:

IAR1.0

;checkforreadcycleend

JMP BACK

CLR IAR1

;disableEEPROMread/write

CLR BP

MOV A,EEDATA

;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

SET IAR1.3

;setWRENbit,enablewriteoperations

SET IAR1.2

;startWriteCycle-setWRbit

BACK:

SZ IAR1.2

;checkforwritecycleend

JMP BACK

CLR IAR1

;disableEEPROMread/write

CLR BP

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