HT66F20 datasheet(203/298 Pages) HOLTEK

203 / 298 page

Rev. 1.90

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

Interrupts

Interruptsareanimportantpartofanymicrocontrollersystem.Whenanexternaleventoran

internalfunctionsuchasaTimerModuleoranA/Dconverterrequiresmicrocontrollerattention,

theircorrespondinginterruptwillenforceatemporarysuspensionofthemainprogramallowingthe

microcontrollertodirectattentiontotheirrespectiveneeds.Thedevicecontainsseveralexternal

interruptandinternalinterruptsfunctions.Theexternalinterruptsaregeneratedbytheactionofthe

externalINT0~INT3andPINTpins,whiletheinternalinterruptsaregeneratedbyvariousinternal

functionssuchastheTMs,Comparators,TimeBase,LVD,EEPROM,SIMandtheA/Dconverter.

Interrupt Registers

Overallinterruptcontrol,whichbasicallymeansthesettingofrequestflagswhencertain

microcontrollerconditionsoccurandthesettingofinterruptenablebitsbytheapplicationprogram,

iscontrolledbyaseriesofregisters,locatedintheSpecialPurposeDataMemory,asshowninthe

accompanyingtable.Thenumberofregistersdependsuponthedevicechosenbutfallintothree

categories.ThefirstistheINTC0~INTC3registerswhichsetuptheprimaryinterrupts,thesecond

istheMFI0~MFI3registerswhichsetuptheMulti-functioninterrupts.FinallythereisanINTEG

registertosetuptheexternalinterrupttriggeredgetype.

Eachregistercontainsanumberofenablebitstoenableordisableindividualregistersaswellas

interruptflagstoindicatethepresenceofaninterruptrequest.Thenamingconventionofthese

followsaspecificpattern.Firstislistedanabbreviatedinterrupttype,thenthe(optional)numberof

thatinterruptfollowedbyeitheran"E"forenable/disablebitor"F"forrequestflag.

Function

Enable Bit

Request Flag

Notes

Glo�al

EMI

—

Compa�ato�

CPnE

CPn�

n=0 o� 1

INTn Pin

INTnE

INTn�

n=0~�

A/D Conve�te�

ADE

AD�

—

M�lti-f�nction

M�nE

M�n�

n=0~5

Time Base

TBnE

TBn�

n=0 o� 1

SIM

SIME

SIM�

—

LVD

LVE

LV�

—

EEPROM

DEE

DE�

—

PINT Pin

XPE

XP�

—

TnPE

TnP�

n=0~�

TnAE

TnA�

TnBE

TnB�

Interrupt Register Bit Naming Conventions

HT66F20 Datasheet(PDF) 203 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 203 Page - Holtek Semiconductor Inc

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