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HT66F20 Datasheet(PDF) 254 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 254 Page - Holtek Semiconductor Inc |
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254 / 298 page  Rev. 1.90 �54 �e���a�� 18� �01� Rev. 1.90 �55 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM • Transmittingdata WhentheUARTistransmittingdata,thedataisshiftedontheTXpinfromtheshiftregister, withtheleastsignificantbitLSBfirst.Inthetransmitmode,theTXRregisterformsabuffer betweentheinternalbusandthetransmittershiftregister.Itshouldbenotedthatif9-bitdata formathasbeenselected,thentheMSBwillbetakenfromtheTX8bitintheUCR1register.The stepstoinitiateadatatransfercanbesummarizedasfollows: ♦ MakethecorrectselectionoftheBNO,PRT,PRENandSTOPSbitstodefinetherequired wordlength,paritytypeandnumberofstopbits. ♦ SetuptheBRGregistertoselectthedesiredbaudrate. ♦ SettheTXENbittoensurethattheUARTtransmitterisenabledandtheTXpinisusedasa UARTtransmitterpin. ♦ AccesstheUSRregisterandwritethedatathatistobetransmittedintotheTXRregister.Note thatthisstepwillcleartheTXIFbit. Thissequenceofeventscannowberepeatedtosendadditionaldata. ItshouldbenotedthatwhenTXIF=0,datawillbeinhibitedfrombeingwrittentotheTXR register.ClearingtheTXIFflagisalwaysachievedusingthefollowingsoftwaresequence: 1.AUSRregisteraccess 2.ATXRregisterwriteexecution Theread-onlyTXIFflagissetbytheUARThardwareandifsetindicatesthattheTXRregister isemptyandthatotherdatacannowbewrittenintotheTXRregisterwithoutoverwritingthe previousdata.IftheTEIEbitisset,thentheTXIFflagwillgenerateaninterrupt.Duringadata transmission,awriteinstructiontotheTXRregisterwillplacethedataintotheTXRregister, whichwillbecopiedtotheshiftregisterattheendofthepresenttransmission.Whenthereisno datatransmissioninprogress,awriteinstructiontotheTXRregisterwillplacethedatadirectly intotheshiftregister,resultinginthecommencementofdatatransmission,andtheTXIFbit beingimmediatelyset.Whenaframetransmissioniscomplete,whichhappensafterstopbits aresentorafterthebreakframe,theTIDLEbitwillbeset.TocleartheTIDLEbitthefollowing softwaresequenceisused: 1.AUSRregisteraccess 2.ATXRregisterwriteexecution NotethatboththeTXIFandTIDLEbitsareclearedbythesamesoftwaresequence. • Transmittingbreak IftheTXBRKbitisset,thenthebreakcharacterswillbesentonthenexttransmission.Break charactertransmissionconsistsofastartbit,followedby13×N"0"bits,whereN=1,2,etc.if abreakcharacteristobetransmitted,thentheTXBRKbitmustbefirstsetbytheapplication programandthenclearedtogeneratethestopbits.Transmittingabreakcharacterwillnot generateatransmitinterrupt.Notethatabreakconditionlengthisatleast13bitslong.Ifthe TXBRKbitiscontinuallykeptatalogichighlevel,thenthetransmittercircuitrywilltransmit continuousbreakcharacters.AftertheapplicationprogramhasclearedtheTXBRKbit,the transmitterwillfinishtransmittingthelastbreakcharacterandsubsequentlysendoutoneortwo stopbits.Theautomaticlogichighattheendofthelastbreakcharacterwillensurethatthestart bitofthenextframeisrecognized. |
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