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HT66F4530 Datasheet(PDF) 152 Page - Holtek Semiconductor Inc |
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HT66F4530 Datasheet(HTML) 152 Page - Holtek Semiconductor Inc |
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152 / 224 page  Rev. 1.00 15� De�e��e� �1� �01� Rev. 1.00 153 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers USR Register TheUSRregisteristhestatusregisterfortheUART,whichcanbereadbytheprogramtodetermine thepresentstatusoftheUART.AllflagswithintheUSRregisterarereadonly.Furtherexplanation oneachoftheflagsisgivenbelow: Bit 7 6 5 4 3 2 1 0 Na�e PERR NF 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 areadtothestatusregisterUSRfollowedbyanaccesstotheTXR_RXRdataregister. Bit6 NF:Noiseflag 0:Nonoiseisdetected 1:Noiseisdetected TheNFflagisthenoiseflag.Whenthisreadonlyflagis"0",itindicatesnonoise condition.Whentheflagis"1",itindicatesthattheUARThasdetectednoiseonthe receiverinput.TheNFflagissetduringthesamecycleastheRXIFflagbutwillnot besetinthecaseofasoverrun.TheNFflagcanbeclearedbyasoftwaresequence whichwillinvolveareadtothestatusregisterUSRfollowedbyanaccesstothe TXR_RXRdataregister. Bit5 FERR:Framingerrorflag 0:Noframingerrorisdetected 1:Framingerrorisdetected TheFERRflagistheframingerrorflag.Whenthisreadonlyflagis"0",itindicates thatthereisnoframingerror.Whentheflagis"1",itindicatesthataframingerror hasbeendetectedforthecurrentcharacter.Theflagcanalsobeclearedbyasoftware sequencewhichwillinvolveareadtothestatusregisterUSRfollowedbyanaccessto theTXR_RXRdataregister. Bit4 OERR:Overrunerrorflag 0:Nooverrunerrorisdetected 1:Overrunerrorisdetected TheOERRflagistheoverrunerrorflagwhichindicateswhenthereceiverbufferhas overflowed.Whenthisreadonlyflagis"0",itindicatesthatthereisnooverrunerror. Whentheflagis"1",itindicatesthatanoverrunerroroccurswhichwillinhibitfurther transferstotheTXR_RXRreceivedataregister.Theflagisclearedbyasoftware sequence,whichisareadtothestatusregisterUSRfollowedbyanaccesstothe TXR_RXRdataregister. 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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