HT45F12 datasheet(32/104 Pages) HOLTEK

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HT45F12

8-Bit Flash MCU with Op Amps & Comparators

HT45F12

8-Bit Flash MCU with Op Amps & Comparators

Programming Considerations

CaremustbetakenthatdataisnotinadvertentlywrittentotheEEPROM.Protectioncanbe

enhancedbyensuringthattheWriteEnablebitisnormallyclearedtozerowhennotwriting.Also

theBankPointercouldbenormallyclearedtozeroasthiswouldinhibitaccesstoBank1where

theEEPROMcontrolregisterexist.Althoughcertainlynotnecessary,considerationmightbegiven

intheapplicationprogramtothecheckingofthevalidityofnewwritedatabyasimplereadback

process.TheWTbitintheEECTRLregistershouldbesetimmediatelyaftertheWTENbitisset,

otherwisetheEEPROMwritecyclewillnotbeexecuted.

Programming Examples

• ReadingdatafromtheEEPROM–pollingmethod

MOV A, EEPROM_ADRES

; user defined address

MOV EEADDR, A

MOV A, 040H

; setup memory pointer MP1

MOV MP1, A

; MP1 points to EECTRL register

MOV A, 01H

; setup Bank Pointer

MOV BP, A

SET IAR1.1

; set RDEN bit, enable read operations

SET IAR1.0

; start Read Cycle - set RD bit

BACK:

SZ IAR1.0

; check for read cycle end

JMP BACK

CLR IAR1

; disable EEPROM read/write

CLR BP

MOV A, EEDATA

; move read data to register

MOV READ_DATA, A

• WritingDatatotheEEPROM-pollingmethod

MOV A, EEPROM_ADRES ; user defined address

MOV EEADDR, A

MOV A, EEPROM_DATA

; user defined data

MOV EEDATA, A

MOV A, 040H

; setup memory pointer MP1

MOV MP1, A

; MP1 points to EECTRL register

MOV A, 01H

; setup Bank Pointer

MOV BP, A

SET IAR1.3

; set WTEN bit, enable write operations

SET IAR1.2

; start Write Cycle - set WT bit

BACK:

SZ IAR1.2

; check for write cycle end

JMP BACK

CLR IAR1

; disable EEPROM read/write

CLR BP

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