HT66F20 datasheet(256/298 Pages) HOLTEK

256 / 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

• Receivingbreak

AnybreakcharacterreceivedbytheUARTwillbemanagedasaframingerror.Thereceiver

willcountandexpectacertainnumberofbittimesasspecifiedbythevaluesprogrammedinto

theBNOandSTOPSbits.Ifthebreakismuchlongerthan13bittimes,thereceptionwillbe

consideredascompleteafterthenumberofbittimesspecifiedbyBNOandSTOPS.TheRXIF

bitisset,FERRisset,zerosareloadedintothereceivedataregister,interruptsaregeneratedif

appropriateandtheRIDLEbitisset.Ifalongbreaksignalhasbeendetectedandthereceiverhas

receivedastartbit,thedatabitsandtheinvalidstopbit,whichsetstheFERRflag,thereceiver

mustwaitforavalidstopbitbeforelookingforthenextstartbit.Thereceiverwillnotmake

theassumptionthatthebreakconditiononthelineisthenextstartbit.Abreakisregardedas

acharacterthatcontainsonlyzeroswiththeFERRflagset.Thebreakcharacterwillbeloaded

intothebufferandnofurtherdatawillbereceiveduntilstopbitsarereceived.Itshouldbenoted

thattheRIDLEreadonlyflagwillgohighwhenthestopbitshavenotyetbeenreceived.The

receptionofabreakcharacterontheUARTregisterswillresultinthefollowing:

♦

Theframingerrorflag,FERR,willbeset.

♦

Thereceivedataregister,RXR,willbecleared.

♦

TheOERR,NF,PERR,RIDLEorRXIFflagswillpossiblybeset.

• Idlestatus

Whenthereceiverisreadingdata,whichmeansitwillbeinbetweenthedetectionofastartbit

andthereadingofastopbit,thereceiverstatusflagintheUSRregister,otherwiseknownasthe

RIDLEflag,willhaveazerovalue.Inbetweenthereceptionofastopbitandthedetectionof

thenextstartbit,theRIDLEflagwillhaveahighvalue,whichindicatesthereceiverisinanidle

condition.

• Receiverinterrupt

ThereadonlyreceiveinterruptflagRXIFintheUSRregisterissetbyanedgegeneratedby

thereceiver.AninterruptisgeneratedifRIE=1,whenawordistransferredfromtheReceive

ShiftRegister,RSR,totheReceiveDataRegister,RXR.Anoverrunerrorcanalsogeneratean

interruptifRIE=1.

HT66F20 Datasheet(PDF) 256 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 256 Page - Holtek Semiconductor Inc

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