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HT45F65 Datasheet(PDF) 192 Page - Holtek Semiconductor Inc |
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HT45F65 Datasheet(HTML) 192 Page - Holtek Semiconductor Inc |
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192 / 231 page  Rev. 1.60 19� �ove��e� ��� �01� Rev. 1.60 193 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Bit3 STOPS:Numberofstopbitsselection 0:Onestopbitformatisused 1:Twostopbitsformatisused Thisbitdeterminesifoneortwostopbitsaretobeused.Whenthisbitisequalto“1”, twostopbitsformatareused.Ifthebitisequalto“0”,thenonlyonestopbitformatis used. Bit2 TXBRK:Transmitbreakcharacter 0:Nobreakcharacteristransmitted 1:Breakcharacterstransmit TheTXBRKbitistheTransmitBreakCharacterbit.Whenthisbitisequalto“0”, therearenobreakcharactersandtheTXpinoperatsnormally.Whenthebitisequalto “1”,therearetransmitbreakcharactersandthetransmitterwillsendlogiczeros.When thisbitisequalto“1”,afterthebuffereddatahasbeentransmitted,thetransmitter outputisheldlowforaminimumofa13-bitlengthanduntiltheTXBRKbitisreset. Bit1 RX8:Receivedatabit8for9-bitdatatransferformat(readonly) Thisbitisonlyusedif9-bitdatatransfersareused,inwhichcasethisbitlocationwill storethe9thbitofthereceiveddataknownasRX8.TheBNObitisusedtodetermine whetherdatatransfesarein8-bitor9-bitformat. Bit0 TX8:Transmitdatabit8for9-bitdatatransferformat(writeonly) Thisbitisonlyusedif9-bitdatatransfersareused,inwhichcasethisbitlocation willstorethe9thbitofthetransmitteddataknownasTX8.TheBNObitisusedto determinewhetherdatatransfesarein8-bitor9-bitformat. UCR2 Register TheUCR2registeristhesecondoftheUARTcontrolregistersandservesseveralpurposes.One ofitsmainfunctionsistocontrolthebasicenable/disableoperationiftheUARTTransmitterand ReceiveraswellasenablingthevariousUARTinterruptsources.Theregisteralsoservestocontrol thebaudratespeed,receiverwake-upfunctionenableandtheaddressdetectfunctionenable. Furtherexplanationoneachofthebitsisgivenbelow: Bit 7 6 5 4 3 2 1 0 �a�e TXE� RXE� BRGH ADDE� 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:UARTTransmitterenablecontrol 0:UARTTransmitterisdisabled 1:UARTTransmitterisenabled ThebitnamedTXENistheTransmitterEnableBit.Whenthisbitisequalto“0”,the transmitterwillbedisabledwithanypendingdatatransmissionsbeingaborted.In additionthebufferswillbereset.InthissituationtheTXpinwillbeusedasanI/Oor otherpin-sharedfunctionalpin.IftheTXENbitisequalto“1”andtheUARTENbitis alsoequalto1,thetransmitterwillbeenabledandtheTXpinwillbecontrolledbythe UART.ClearingtheTXENbitduringatransmissionwillcausethedatatransmission tobeabortedandwillresetthetransmitter.Ifthissituationoccurs,theTXpinwillbe usedasanI/Oorotherpin-sharedfunctionalpin. |
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