HT66F4530 datasheet(50/224 Pages) HOLTEK

50 / 224 page

Rev. 1.00

De�e��e� �1� �01�

Rev. 1.00

De�e��e� �1� �01�

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

Programming Considerations

CaremustbetakenthatdataisnotinadvertentlywrittentotheEEPROM.Protectioncanbe

enhancedbyensuringthattheWriteEnablebitisnormallyclearedtozerowhennotwriting.Also

theMemoryPointerhighbyteregister,MP1HorMP2H,couldbenormallyclearedtozeroasthis

wouldinhibitaccesstoSector1wheretheEEPROMcontrolregisterexists.Althoughcertainlynot

necessary,considerationmightbegivenintheapplicationprogramtothecheckingofthevalidityof

newwritedatabyasimplereadbackprocess.

WhenwritingdatatheWRbitmustbesethighimmediatelyaftertheWRENbithasbeensethigh,

toensurethewritecycleexecutescorrectly.TheglobalinterruptbitEMIshouldalsobecleared

beforeawritecycleisexecutedandthenre-enabledafterthewritecyclestarts.Notethatthese

devicesshouldnotentertheIDLEorSLEEPmodeuntiltheEEPROMreadorwriteoperationis

totallycomplete.Otherwise,theEEPROMreadorwriteoperationwillfail.

Programming Examples

• Reading data from the EEPROM – polling method

MOV A,EEPROM_ADRES ;userdefinedaddress

MOV EEA,A

MOV A,040H;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,040H;setupmemorypointerMP1L

MOV MP1L,A ;MP1LpointstoEECregister

MOV A,01H ;setupmemorypointerMP1H

MOV MP1H,A

CLR EMI

SET IAR1.3 ;setWRENbit,enablewriteoperations

SET IAR1.2 ;startWriteCycle-setWRbit—executedimmediately

;aftersetWRENbit

SET EMI

BACK:

SZ IAR1.2 ;checkforwritecycleend

JMP BACK

CLR IAR1;disableEEPROMread/write

CLR MP1H

HT66F4530 데이터시트(PDF) 50 Page - Holtek Semiconductor Inc

HT66F4530 데이터시트(HTML) 50 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL