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HT45F75 Datasheet(PDF) 133 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 133 Page - Holtek Semiconductor Inc |
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133 / 190 page  Rev. 1.10 13� De�e��e� 1�� �01� Rev. 1.10 133 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Bit5 PREN:Parityfunctionenablecontrol 0:Parityfunctionisdisabled 1:Parityfunctionisenabled Thisistheparityenablebit.Whenthisbitisequalto"1",theparityfunctionwillbe enabled.Ifthebitisequalto"0",thentheparityfunctionwillbedisabled.Replacethe mostsignificantbitpositionwithaparitybit. Bit4 PRT:Paritytypeselectionbit 0:Evenparityforparitygenerator 1:Oddparityforparitygenerator Thisbitistheparitytypeselectionbit.Whenthisbitisequalto"1",oddparitytype willbeselected.Ifthebitisequalto"0",thenevenparitytypewillbeselected. Bit3 STOPS:NumberofStopbitsselection 0:Onestopbitformatisused 1:Twostopbitsformatisused Thisbitdeterminesifoneortwostopbitsaretobeused.Whenthisbitisequalto"1", twostopbitsareused.Ifthisbitisequalto"0",thenonlyonestopbitisused. 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.InthissituationtheTXpinwillbeusedasanI/Oor otherpin-sharedfunctionalpin. |
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