HT45F75 datasheet(140/190 Pages) HOLTEK

140 / 190 page

Rev. 1.10

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Rev. 1.10

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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

RIE=1.

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