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HT45F65 Datasheet(PDF) 199 Page - Holtek Semiconductor Inc |
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HT45F65 Datasheet(HTML) 199 Page - Holtek Semiconductor Inc |
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199 / 231 page  Rev. 1.60 198 �ove��e� ��� �01� Rev. 1.60 199 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU • SetuptheBRGregistertoselectthedesiredbaudrate. • SettheRXENbittoensurethattheUARTreceiverisenabledandtheRXpinisusedasaUART receiverpin. Atthispointthereceiverwillbeenabledwhichwillbegintolookforastartbit. Whenacharacterisreceived,thefollowingsequenceofeventswilloccur: • TheRXIFbitintheUSRregisterwillbesetthenRXRregisterhasdataavailable,atleastthree morecharactercanberead. • WhenthecontentsoftheshiftregisterhavebeentransferredtotheRXRregisterandiftheRIE bitisset,thenaninterruptwillbegenerated. • Ifduringreception,aframeerror,noiseerror,parityerrororanoverrunerrorhasbeendetected, thentheerrorflagscanbeset. TheRXIFbitcanbeclearedusingthefollowingsoftwaresequence: 1.AUSRregisteraccess 2.ARXRregisterreadexecution Receiving Break AnybreakcharacterreceivedbytheUARTwillbemanagedasaframingerror.Thereceiverwill countandexpectacertainnumberofbittimesasspecifiedbythevaluesprogrammedintotheBNO andSTOPSbits.Ifthebreakismuchlongerthan13bittimes,thereceptionwillbeconsideredas completeafterthenumberofbittimesspecifiedbyBNOandSTOPS.TheRXIFbitisset,FERR isset,zerosareloadedintothereceivedataregister,interruptsaregeneratedifappropriateandthe RIDLEbitisset.Ifalongbreaksignalhasbeendetectedandthereceiverhasreceivedastartbit, thedatabitsandtheinvalidstopbit,whichsetstheFERRflag,thereceivermustwaitforavalid stopbitbeforelookingforthenextstartbit.Thereceiverwillnotmaketheassumptionthatthe breakconditiononthelineisthenextstartbit.Abreakisregardedasacharacterthatcontainsonly zeroswiththeFERRflagset.Thebreakcharacterwillbeloadedintothebufferandnofurtherdata willbereceiveduntilstopbitsarereceived.ItshouldbenotedthattheRIDLEreadonlyflagwillgo highwhenthestopbitshavenotyetbeenreceived.ThereceptionofabreakcharacterontheUART registerswillresultinthefollowing: • Theframingerrorflag,FERR,willbeset. • Thereceivedataregister,RXR,willbecleared. • TheOERR,NF,PERR,RIDLEorRXIFflagswillpossiblybeset. Idle Status Whenthereceiverisreadingdata,whichmeansitwillbeinbetweenthedetectionofastartbitand thereadingofastopbit,thereceiverstatusflagintheUSRregister,otherwiseknownastheRIDLE flag,willhaveazerovalue.Inbetweenthereceptionofastopbitandthedetectionofthenextstart bit,theRIDLEflagwillhaveahighvalue,whichindicatesthereceiverisinanidlecondition. Receiver Interrupt ThereadonlyreceiveinterruptflagRXIFintheUSRregisterissetbyanedgegeneratedbythe receiver.AninterruptisgeneratedifRIE=1,whenawordistransferredfromtheReceiveShift Register,RSR,totheReceiveDataRegister,RXR.Anoverrunerrorcanalsogenerateaninterruptif RIE=1. |
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