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HT45F75 Datasheet(PDF) 140 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 140 Page - Holtek Semiconductor Inc |
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140 / 190 page  Rev. 1.10 1�0 De�e��e� 1�� �01� Rev. 1.10 1�1 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Whenacharacterisreceivedthefollowingsequenceofeventswilloccur: • TheRXIFbitintheUSRregisterwillbesetwhenRXRregisterhasdataavailable,atleastone morecharactercanberead. • WhenthecontentsoftheshiftregisterhavebeentransferredtotheRXRregister,theniftheRIE bitisset,aninterruptwillbegenerated. • Ifduringreception,aframeerror,noiseerror,parityerror,oranoverrunerrorhasbeendetected, thentheerrorflagscanbeset. TheRXIFbitcanbeclearedusingthefollowingsoftwaresequence: 1.AUSRregisteraccess 2.AnRXRregisterreadexecution Receive 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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