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HT66F20 Datasheet(PDF) 248 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 248 Page - Holtek Semiconductor Inc |
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248 / 298 page  Rev. 1.90 �48 �e���a�� 18� �01� Rev. 1.90 �49 �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 Bit2 TXBRK:Transmitbreakcharacter 0:Nobreakcharacteristransmitted 1:Breakcharacterstransmit TheTXBRKbitistheTransmitBreakCharacterbit.Whenthisbitis0,thereare nobreakcharactersandtheTXpinoperatesnormally.Whenthebitis1,thereare transmitbreakcharactersandthetransmitterwillsendlogiczeros.Whenthisbitis equalto1,afterthebuffereddatahasbeentransmitted,thetransmitteroutputisheld lowforaminimumofa13-bitlengthanduntiltheTXBRKbitisreset. Bit1 RX8:Receivedatabit8for9-bitdatatransferformat(readonly) Thisbitisonlyusedif9-bitdatatransfersareused,inwhichcasethisbitlocationwill storethe9thbitofthereceiveddataknownasRX8.TheBNObitisusedtodetermine whetherdatatransfersarein8-bitor9-bitformat. Bit0 TX8:Transmitdatabit8for9-bitdatatransferformat(writeonly) Thisbitisonlyusedif9-bitdatatransfersareused,inwhichcasethisbitlocation willstorethe9thbitofthetransmitteddataknownasTX8.TheBNObitisusedto determinewhetherdatatransfersarein8-bitor9-bitformat. UCR2 register TheUCR2registeristhesecondoftheUARTcontrolregistersandservesseveralpurposes.One ofitsmainfunctionsistocontrolthebasicenable/disableoperationiftheUARTTransmitterand ReceiveraswellasenablingthevariousUARTinterruptsources.Theregisteralsoservestocontrol thebaudratespeed,receiverwake-upfunctionenableandtheaddressdetectfunctionenable. Furtherexplanationoneachofthebitsisgivenbelow: Bit 7 6 5 4 3 2 1 0 Name TXEN RXEN BRGH ADDEN WAKE RIE TIIE TEIE R/W R/W R/W R/W R/W R/W R/W R W POR 0 0 0 0 1 0 1 1 Bit7 TXEN:UARTTransmitterenablecontrol 0:UARTtransmitterisdisabled 1:UARTtransmitterisenabled ThebitnamedTXENistheTransmitterEnableBit.Whenthisbitisequalto0,the transmitterwillbedisabledwithanypendingdatatransmissionsbeingaborted.In additionthebufferswillbereset.InthissituationtheTXpinwillbeinthestateof highimpedance.IftheTXENbitisequalto1andtheUARTENbitisalsoequalto 1,thetransmitterwillbeenabledandtheTXpinwillbecontrolledbytheUART. ClearingtheTXENbitduringatransmissionwillcausethedatatransmissiontobe abortedandwillresetthetransmitter.Ifthissituationoccurs,theTXpinwillbeinthe stateofhighimpedance. Bit6 RXEN:UARTReceiverenablecontrol 0:UARTreceiverisdisabled 1:UARTreceiverisenabled ThebitnamedRXENistheReceiverEnableBit.Whenthisbitisequalto0,the receiverwillbedisabledwithanypendingdatareceptionsbeingaborted.Inaddition thereceivebufferswillbereset.InthissituationtheRXpinwillbeinthestateofhigh impedance.IftheRXENbitisequalto1andtheUARTENbitisalsoequalto1,the receiverwillbeenabledandtheRXpinwillbecontrolledbytheUART.Clearingthe RXENbitduringareceptionwillcausethedatareceptiontobeabortedandwillreset thereceiver.Ifthissituationoccurs,theRXpinwillbeinthestateofhighimpedance. |
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