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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT67F488 데이터시트(PDF) 121 Page - Holtek Semiconductor Inc |
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HT67F488 데이터시트(HTML) 121 Page - Holtek Semiconductor Inc |
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121 / 171 page  Rev. 1.60 1�1 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM 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 Theformatofthedatatobetransferrediscomposedofvariousfactorssuchasdatabitlength, 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. St ar t B it Bi t 0 Bi t 1 Bi t 2 Bi t 3 Bi t 4 Bi t 5 Bi t 6 Bi t 7 St op B it Ne xt St ar t Bi t Pa ri ty B it 8- Bi t Da ta F or ma t St ar t B it Bi t 0 Bi t 1 Bi t 2 Bi t 3 Bi t 4 Bi t 5 Bi t 6 Bi t 7 St op B it Ne xt St ar t Bi t Pa ri ty B it 9- Bi t Da ta F or ma t Bi t 8 |
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