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HT45F75 Datasheet(PDF) 137 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 137 Page - Holtek Semiconductor Inc |
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137 / 190 page  Rev. 1.10 13� De�e��e� 1�� �01� Rev. 1.10 137 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU UART Setup and Control Fordatatransfer,theUARTfunctionutilizesanon-return-to-zero,morecommonlyknownasNRZ, format.Thisiscomposedofonestartbit,eightorninedatabits,andoneortwostopbits.Parity issupportedbytheUARThardware,andcanbesetuptobeeven,oddornoparity.Forthemost commondataformat,8databitsalongwithnoparityandonestopbit,denotedas8,N,1,isused asthedefaultsetting,whichisthesettingatpower-on.Thenumberofdatabitsandstopbits,along withtheparity,aresetupbyprogrammingthecorrespondingBNO,PRT,PREN,andSTOPSbits intheUCR1register.Thebaudrateusedtotransmitandreceivedataissetupusingtheinternal 8-bitbaudrategenerator,whilethedataistransmittedandreceivedLSBfirst.AlthoughtheUART transmitterandreceiverarefunctionallyindependent,theybothusethesamedataformatandbaud rate.Inallcasesstopbitswillbeusedfordatatransmission. Enabling/Disabling the UART Thebasicon/offfunctionoftheinternalUARTfunctioniscontrolledusingtheUARTENbitinthe UCR1register.IftheUARTEN,TXENandRXENbitsareset,thenthesetwoUARTpinswillact asnormalTXoutputpinandRXinputpinrespectively.IfnodataisbeingtransmittedontheTX pin,thenitwilldefaulttoalogichighvalue. ClearingtheUARTENbitwilldisabletheTXandRXpinsandallowthesetwopinstobeusedas normalI/Oorotherpin-sharedfunctionalpins.WhentheUARTfunctionisdisabledthebufferwill beresettoanemptycondition,atthesametimediscardinganyremainingresidualdata.Disabling theUARTwillalsoresettheerrorandstatusflagswithbitsTXEN,RXEN,TXBRK,RXIF,OERR, FERR,PERRandNFbeingclearedwhilebitsTIDLE,TXIFandRIDLEwillbeset.Theremaining controlbitsintheUCR1,UCR2andBRGregisterswillremainunaffected.IftheUARTENbitin theUCR1registerisclearedwhiletheUARTisactive,thenallpendingtransmissionsandreceptions willbeimmediatelysuspendedandtheUARTwillberesettoaconditionasdefinedabove.Ifthe UARTisthensubsequentlyre-enabled,itwillrestartagaininthesameconfiguration. Data, Parity and Stop Bit Selection Theformatofthedatatobetransferred,iscomposedofvariousfactorssuchasdatabitlength, parityon/off,paritytype,addressbitsandthenumberofstopbits.Thesefactorsaredeterminedby thesetupofvariousbitswithintheUCR1register.TheBNObitcontrolsthenumberofdatabits whichcanbesettoeither8or9,thePRTbitcontrolsthechoiceofoddorevenparity,thePREN bitcontrolstheparityon/offfunctionandtheSTOPSbitdecideswhetheroneortwostopbitsareto beused.Thefollowingtableshowsvariousformatsfordatatransmission.Theaddressbitidentifies theframeasanaddresscharacter.Thenumberofstopbits,whichcanbeeitheroneortwo,is independentofthedatalength. Start Bit Data Bits Address Bits Parity Bits Stop Bit Example of 8-bit Data Formats 1 8 0 0 1 1 7 0 1 1 1 7 1 0 1 Example of 9-bit Data Formats 1 9 0 0 1 1 8 0 1 1 1 8 1 0 1 Transmitter Receiver Data Format Thefollowingdiagramshowsthetransmitandreceivewaveformsforboth8-bitand9-bitdata formats. |
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