HT66F20 datasheet(259/298 Pages) HOLTEK

259 / 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

• Addressdetectmode

SettingtheAddressDetectfunctionenablecontrolbit,ADDEN,intheUCR2register,enables

thisspecialfunction.Ifthisbitissetto1,thenanadditionalqualifierwillbeplacedonthe

generationofaReceiverDataAvailableinterrupt,whichisrequestedbytheRXIFflag.Ifthe

ADDENbitisequalto1,thenwhenthedataisavailable,aninterruptwillonlybegenerated,if

thehighestreceivedbithasahighvalue.Notethattherelatedinterruptenablecontrolbitandthe

EMIbitofthemicrocontrollermustalsobeenabledforcorrectinterruptgeneration.Thehighest

addressbitisthe9thbitifthebitBNO=1orthe8thbitifthebitBNO=0.Ifthehighestbitis

high,thenthereceivedwordwillbedefinedasanaddressratherthandata.ADataAvailable

interruptwillbegeneratedeverytimethelastbitofthereceivedwordisset.IftheADDENbit

isequalto0,thenaReceiveDataAvailableinterruptwillbegeneratedeachtimetheRXIFflag

isset,irrespectiveofthedatalastbutstatus.Theaddressdetectandparityfunctionsaremutually

exclusivefunctions.Thereforeiftheaddressdetectfunctionisenabled,thentoensurecorrect

operation,theparityfunctionshouldbedisabledbyresettingtheparityfunctionenablebitPREN

tozero.

ADDEN

Bit 9 (BNO=1)

Bit 8 (BNO=0)

UART Interrupt

Generated

√

ADDEN Bit Function

UART Module Power-down and Wake-up

TheMCUandUARTModulearepowereddownindependentlyofeachother.Themethodof

poweringdowntheMCUiscoveredinthepreviousMCUsectionofthedatasheet.TheUART

ModulemustbepowereddownbeforetheMCUispowereddown.Thisisimplementedbyfirst

clearingtheUARTENbitintheUCR1registertodisabletheUARTModulecircuitryafterwhich

theSCSinternallinecanbesethightodisabletheSPIinterfacecircuits.WhentheUARTand

SPIinterfacesarepowereddown,theSCKandCLKIclocksourcestotheUARTmodulewillbe

disabled.TheUARTModulecanbepoweredupbytheMCUbyfirstclearingtheSCSlinetozero

andthensettingtheUARTENbit.IftheUARTcircuitsispowereddownwhileatransmissionisstill

inprogress,thenthetransmissionwillbeterminatedandtheexternalTXtransmitpinwillbeforced

toalogichighlevel.Inasimilarway,iftheUARTcircuitsispowereddownwhilereceivingdata,

thenthereceptionofdatawilllikewisebeterminated.WhentheUARTcircuitsispowereddown,

notethattheUSR,UCR1,UCR2,UCR3,transmitandreceiveregisters,aswellastheBRGregister

willnotbeaffected.

TheUARTModulecontainsareceiverRXpinwake-upfunction,whichisenabledordisabledby

theWAKEbitintheUCR2register.Ifthisbit,alongwiththeUARTenablebitnamedUARTEN,

thereceiverenablebitnamedRXENandthereceiverinterruptenablebitnamedRIE,areallset

beforetheMCUandUARTmoduleareispowereddown,thenafallingedgeontheRXpinwill

wakeuptheMCUfromitspowerdowncondition.Notethatasittakesacertainperiodoftime

knownastheSystemStart-upTimeforoscillatortorestartandstabilizeafterawake-up,anydata

receivedduringthistimeontheRXpinwillbeignored.

ForaUARTwake-upinterrupttooccur,inadditiontothebitsforthewake-upenablecontrol

andReceiveinterruptenablecontrolbeingset,theglobalinterruptenablecontrolandtherelated

interruptenablecontrolbitsmustalsobeset.Ifthesetwobitsarenotset,thenonlyawake-upevent

willoccurandnointerruptwillbeserviced.Notealsothatasittakesaperiodofdelayafterawake-

upbeforenormalmicrocontrollerresumes,therelevantUARTinterruptwillnotbeserviceduntil

thisperiodofdelaytimehaselapsed.

HT66F20 Datasheet(PDF) 259 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 259 Page - Holtek Semiconductor Inc

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