HT66F20 datasheet(224/298 Pages) HOLTEK

224 / 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

Serial Interface Module Interrupt

TheSerialInterfaceModuleInterrupt,alsoknownastheSIMinterrupt,iscontainedwithinthe

Multi-functionInterrupt.ASIMInterruptrequestwilltakeplacewhentheSIMInterruptrequest

flag,SIMF,isset,whichoccurswhenabyteofdatahasbeenreceivedortransmittedbytheSIM

interface.Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,theglobal

interruptenablebit,EMI,andtheSerialInterfaceInterruptenablebit,SIME,andMuti-function

interruptenablebits,mustfirstbeset.Whentheinterruptisenabled,thestackisnotfullandabyte

ofdatahasbeentransmittedorreceivedbytheSIMinterface,asubroutinecalltotherespective

Multi-functionInterruptvector,willtakeplace.WhentheSerialInterfaceInterruptisserviced,the

EMIbitwillbeautomaticallyclearedtodisableotherinterrupts,howeveronlytheMulti-function

interruptrequestflagwillbealsoautomaticallycleared.AstheSIMFflagwillnotbeautomatically

cleared,ithastobeclearedbytheapplicationprogram.

External Peripheral Interrupt

TheExternalPeripheralInterruptoperatesinasimilarwaytotheexternalinterruptandiscontained

withintheMulti-functionInterrupt.APeripheralInterruptrequestwilltakeplacewhentheExternal

PeripheralInterruptrequestflag,XPF,isset,whichoccurswhenanegativeedgetransitionappears

onthePINTpin.Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,the

globalinterruptenablebit,EMI,externalperipheralinterruptenablebit,XPE,andassociated

Multi-functioninterruptenablebit,mustfirstbeset.Whentheinterruptisenabled,thestackisnot

fullandanegativetransitionappearsontheExternalPeripheralInterruptpin,asubroutinecallto

therespectiveMulti-functionInterrupt,willtakeplace.WhentheExternalPeripheralInterruptis

serviced,theEMIbitwillbeautomaticallyclearedtodisableotherinterrupts,howeveronlythe

Multi-functioninterruptrequestflagwillbealsoautomaticallycleared.

AstheXPFflagwillnotbeautomaticallycleared,ithastobeclearedbytheapplicationprogram.

Theexternalperipheralinterruptpinispin-sharedwithseveralotherpinswithdifferentfunctions.It

mustthereforebeproperlyconfiguredtoenableittooperateasanExternalPeripheralInterruptpin.

EEPROM Interrupt

TheEEPROMInterrupt,iscontainedwithintheMulti-functionInterrupt.AnEEPROMInterrupt

requestwilltakeplacewhentheEEPROMInterruptrequestflag,DEF,isset,whichoccurswhenan

EEPROMWriteorReadcycleends.Toallowtheprogramtobranchtoitsrespectiveinterruptvector

address,theglobalinterruptenablebit,EMI,EEPROMInterruptenablebit,DEE,andassociated

Multi-functioninterruptenablebit,mustfirstbeset.Whentheinterruptisenabled,thestackisnot

fullandanEEPROMWriteorReadcycleends,asubroutinecalltotherespectiveMulti-function

Interruptvector,willtakeplace.WhentheEEPROMInterruptisserviced,theEMIbitwillbe

automaticallyclearedtodisableotherinterrupts,howeveronlytheMulti-functioninterruptrequest

flagwillbealsoautomaticallycleared.AstheDEFflagwillnotbeautomaticallycleared,ithastobe

clearedbytheapplicationprogram.

HT66F20 Datasheet(PDF) 224 Page - Holtek Semiconductor Inc

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