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HT66F019 Datasheet(PDF) 136 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 136 Page - Holtek Semiconductor Inc |
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136 / 175 page  Rev. 1.00 136 De�e��e� 01� �01� Rev. 1.00 13� De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Bit2 TXBRK:Transmitbreakcharacter 0:Nobreakcharacteristransmitted 1:Breakcharacterstransmit TheTXBRKbitistheTransmitBreakCharacterbit.Whenthisbitis"0",thereare nobreakcharactersandtheTXpinoperatesnormally.Whenthebitis"1",thereare transmitbreakcharactersandthetransmitterwillsendlogiczeros.Whenthisbitis equalto"1",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 TheUCR2registeristhesecondofthetwoUARTcontrolregistersandservesseveralpurposes.One ofitsmainfunctionsistocontrolthebasicenable/disableoperationoftheUARTTransmitterand ReceiveraswellasenablingthevariousUARTinterruptsources.Theregisteralsoservestocontrol thebaudratespeed,receiverwake-upenableandtheaddressdetectenable.Furtherexplanationon eachofthebitsisgivenbelow: Bit 7 6 5 4 3 2 1 0 Na�e TXEN RXEN BRGH ADDEN WAKE RIE TIIE TEIE R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 0 0 0 0 0 0 Bit7 TXEN:UARTTransmitterenabledcontrol 0:UARTtransmitterisdisabled 1:UARTtransmitterisenabled ThebitnamedTXENistheTransmitterEnableBit.Whenthisbitisequalto"0",the transmitterwillbedisabledwithanypendingdatatransmissionsbeingaborted.In additionthebufferswillbereset.InthissituationtheTXpinwillbesetinafloating state. IftheTXENbitisequalto"1"andtheUARTENbitisalsoequalto"1",the transmitterwillbeenabledandtheTXpinwillbecontrolledbytheUART.Clearing theTXENbitduringatransmissionwillcausethedatatransmissiontobeabortedand willresetthetransmitter.Ifthissituationoccurs,theTXpinwillbesetinafloating state. Bit6 RXEN:UARTReceiverenabledcontrol 0:UARTreceiverisdisabled 1:UARTreceiverisenabled ThebitnamedRXENistheReceiverEnableBit.Whenthisbitisequalto"0",the receiverwillbedisabledwithanypendingdatareceptionsbeingaborted.Inaddition thereceivebufferswillbereset.InthissituationtheRXpinwillbesetinafloating state.IftheRXENbitisequalto"1"andtheUARTENbitisalsoequalto"1",the receiverwillbeenabledandtheRXpinwillbecontrolledbytheUART.Clearingthe RXENbitduringareceptionwillcausethedatareceptiontobeabortedandwillreset thereceiver.Ifthissituationoccurs,theRXpinwillbesetinafloatingstate. |
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