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HT66F20 Datasheet(PDF) 247 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 247 Page - Holtek Semiconductor Inc |
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247 / 298 page  Rev. 1.90 �46 �e���a�� 18� �01� Rev. 1.90 �47 �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 UCR1 register TheUCR1registertogetherwiththeUCR2registerarethetwoUARTcontrolregistersthatareused tosetthevariousoptionsfortheUARTfunctionsuchasoverallon/offcontrol,paritycontrol,data transferbitlength,etc.Furtherexplanationoneachofthebitsisgivenbelow: Bit 7 6 5 4 3 2 1 0 Name UARTEN BNO PREN PRT STOPS TXBRK RX8 TX8 R/W R/W R/W R/W R/W R/W R/W R W POR 0 0 0 0 0 0 × 0 “×” �nknown Bit7 UARTEN:UARTfunctionenablecontrol 0:DisableUART.TXandRXpinsareinthestateofhighimpedance 1:EnableUART.TXandRXpinsfunctionasUARTpins TheUARTENbitistheUARTenablebit.Whenthisbitisequalto0,theUART willbedisabledandtheRXpinaswellastheTXpinwillbeinthestateofhigh impedance.Whenthebitisequalto1,theUARTwillbeenabledandtheTXandRX pinswillfunctionasdefinedbytheTXENandRXENenablecontrolbits.Whenthe UARTisdisabled,itwillemptythebuffersoanycharacterremaininginthebufferwill bediscarded.Inaddition,thevalueofthebaudratecounterwillbereset.IftheUART isdisabled,allerrorandstatusflagswillbereset.AlsotheTXEN,RXEN,TXBRK, RXIF,OERR,FERR,PERRandNFbitswillbecleared,whiletheTIDLE,TXIFand RIDLEbitswillbeset.OthercontrolbitsinUCR1,UCR2andBRGregisterswill remainunaffected.IftheUARTisactiveandtheUARTENbitiscleared,allpending transmissionsandreceptionswillbeterminatedandthemodulewillberesetasdefined above.WhentheUARTisre-enabled,itwillrestartinthesameconfiguration. Bit6 BNO:Numberofdatatransferbitsselection 0:8-bitdatatransfer 1:9-bitdatatransfer Thisbitisusedtoselectthedatalengthformat,whichcanhaveachoiceofeither8-bit or9-bitformat.Whenthisbitisequalto1,a9-bitdatalengthformatwillbeselected. Ifthebitisequalto0,thenan8-bitdatalengthformatwillbeselected.If9-bitdata lengthformatisselected,thenbitsRX8andTX8willbeusedtostorethe9thbitofthe receivedandtransmitteddatarespectively. Bit5 PREN:Parityfunctionenablecontrol 0:Parityfunctionisdisabled 1:Parityfunctionisenabled Thisistheparityenablebit.Whenthisbitisequalto1,theparityfunctionwillbe enabled.Ifthebitisequalto0,thentheparityfunctionwillbedisabled. Bit4 PRT:Paritytypeselectionbit 0:Evenparityforparitygenerator 1:Oddparityforparitygenerator Thisbitistheparitytypeselectionbit.Whenthisbitisequalto1,oddparitytypewill beselected.Ifthebitisequalto0,thenevenparitytypewillbeselected. Bit3 STOPS:NumberofStopbitsselection 0:Onestopbitformatisused 1:Twostopbitsformatisused Thisbitdeterminesifoneortwostopbitsaretobeused.Whenthisbitisequalto1, twostopbitsareused.Ifthisbitisequalto0,thenonlyonestopbitisused. |
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