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HT45F75 Datasheet(PDF) 131 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 131 Page - Holtek Semiconductor Inc |
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131 / 190 page  Rev. 1.10 130 De�e��e� 1�� �01� Rev. 1.10 131 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU ThePERRflagistheparityerrorflag.Whenthisreadonlyflagis"0",itindicatesa parityerrorhasnotbeendetected.Whentheflagis"1",itindicatesthattheparityof thereceivedwordisincorrect.ThiserrorflagisapplicableonlyifParitymode(oddor even)isselected.Theflagcanalsobeclearedbyasoftwaresequencewhichinvolves areadtothestatusregisterUSRfollowedbyanaccesstotheRXRdataregister. Bit6 NF:Noiseflag 0:Nonoiseisdetected 1:Noiseisdetected TheNFflagisthenoiseflag.Whenthisreadonlyflagis"0",itindicatesnonoise condition.Whentheflagis"1",itindicatesthattheUARThasdetectednoiseonthe receiverinput.TheNFflagissetduringthesamecycleastheRXIFflagbutwillnot besetinthecaseofasoverrun.TheNFflagcanbeclearedbyasoftwaresequence whichwillinvolveareadtothestatusregisterUSRfollowedbyanaccesstotheRXR dataregister. Bit5 FERR:Framingerrorflag 0:Noframingerrorisdetected 1:Framingerrorisdetected TheFERRflagistheframingerrorflag.Whenthisreadonlyflagis"0",itindicates thatthereisnoframingerror.Whentheflagis"1",itindicatesthataframingerror hasbeendetectedforthecurrentcharacter.Theflagcanalsobeclearedbyasoftware sequencewhichwillinvolveareadtothestatusregisterUSRfollowedbyanaccessto theRXRdataregister. Bit4 OERR:Overrunerrorflag 0:Nooverrunerrorisdetected 1:Overrunerrorisdetected TheOERRflagistheoverrunerrorflagwhichindicateswhenthereceiverbufferhas overflowed.Whenthisreadonlyflagis"0",itindicatesthatthereisnooverrunerror. Whentheflagis"1",itindicatesthatanoverrunerroroccurswhichwillinhibitfurther transferstotheRXRreceivedataregister.Theflagisclearedbyasoftwaresequence, whichisareadtothestatusregisterUSRfollowedbyanaccesstotheRXRdata register. Bit3 RIDLE:Receiverstatus 0:Datareceptionisinprogress(databeingreceived) 1:Nodatareceptionisinprogress(receiverisidle) TheRIDLEflagisthereceiverstatusflag.Whenthisreadonlyflagis"0",itindicates thatthereceiverisbetweentheinitialdetectionofthestartbitandthecompletionof thestopbit.Whentheflagis"1",itindicatesthatthereceiverisidle.Betweenthe completionofthestopbitandthedetectionofthenextstartbit,theRIDLEbitis"1" indicatingthattheUARTreceiverisidleandtheRXpinstaysinlogichighcondition. Bit2 RXIF:ReceiveRXRdataregisterstatus 0:RXRdataregisterisempty 1:RXRdataregisterhasavailabledata TheRXIFflagisthereceivedataregisterstatusflag.Whenthisreadonlyflagis"0", itindicatesthattheRXRreaddataregisterisempty.Whentheflagis"1",itindicates thattheRXRreaddataregistercontainsnewdata.Whenthecontentsoftheshift registeraretransferredtotheRXRregister,aninterruptisgeneratedifRIE=1inthe UCR2register.Ifoneormoreerrorsaredetectedinthereceivedword,theappropriate receive-relatedflagsNF,FERR,and/orPERRaresetwithinthesameclockcycle.The RXIFflagisclearedwhentheUSRregisterisreadwithRXIFset,followedbyaread fromtheRXRregister,andiftheRXRregisterhasnodataavailable. Bit1 TIDLE:Transmissionidle 0:Datatransmissionisinprogress(databeingtransmitted) 1:Nodatatransmissionisinprogress(transmitterisidle) |
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