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HT67F488 Datasheet(PDF) 114 Page - Holtek Semiconductor Inc |
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HT67F488 Datasheet(HTML) 114 Page - Holtek Semiconductor Inc |
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114 / 171 page  Rev. 1.60 114 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM USR Register TheUSRregisteristhestatusregisterfortheUART,whichcanbereadbytheprogramtodetermine thepresentstatusoftheUART.AllflagswithintheUSRregisterarereadonly.Furtherexplanation oneachoftheflagsisgivenbelow: Bit 7 6 5 4 3 2 1 0 �a�e PERR �F FERR OERR RIDLE RXIF TIDLE TXIF R/W R R R R R R R R POR 0 0 0 0 1 0 1 1 Bit7 PERR:Parityerrorflag 0:Noparityerrorisdetected 1:Parityerrorisdetected 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. |
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