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HT45F65 Datasheet(PDF) 165 Page - Holtek Semiconductor Inc |
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HT45F65 Datasheet(HTML) 165 Page - Holtek Semiconductor Inc |
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165 / 231 page  Rev. 1.60 16� �ove��e� ��� �01� Rev. 1.60 16� �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Slave Address ThetransmissionofaSTARTsignalbythemasterwillbedetectedbyalldevicesontheI2Cbus. Todeterminewhichslavedevicethemasterwishestocommunicatewith,theaddressoftheslave devicewillbesentoutimmediatelyfollowingtheSTARTsignal.Allslavedevices,afterreceiving this7-bitaddressdata,willcompareitwiththeirown7-bitslaveaddress.Iftheaddresssentoutby themastermatchestheinternaladdressofthemicrocontrollerslavedevice,thenaninternalI2Cbus interruptsignalwillbegenerated.Thenextbitfollowingtheaddress,whichisthe8thbit,defines theread/writestatusandwillbesavedtotheSRWbitoftheSIMC1register.Theslavedevicewill thentransmitanacknowledgebit,whichisalowlevel,asthe9thbit.Theslavedevicewillalsoset thestatusflagHAASwhentheaddressesmatch. AsanI2Cbusinterruptcancomefromtwosources,whentheprogramenterstheinterrupt subroutine,theHAASbitshouldbeexaminedtoseewhethertheinterruptsourcehascomefrom amatchingslaveaddressorfromthecompletionofadatabytetransfer.Whenaslaveaddressis matched,thedevicemustbeplacedineitherthetransmitmodeandthenwritedatatotheSIMD register,orinthereceivemodewhereitmustimplementadummyreadfromtheSIMDregisterto releasetheSCLline. I2C Bus Read/Write Signal TheSRWbitintheSIMC1registerdefineswhethertheslavedevicewishestoreaddatafromthe I2CbusorwritedatatotheI2Cbus.Theslavedeviceshouldexaminethisbittodetermineifitisto beatransmitterorareceiver.IftheSRWflagis"1"thenthisindicatesthatthemasterdevicewishes toreaddatafromtheI2Cbus,thereforetheslavedevicemustbesetuptosenddatatotheI2Cbusas atransmitter.IftheSRWflagis"0"thenthisindicatesthatthemasterwishestosenddatatotheI2C bus,thereforetheslavedevicemustbesetuptoreaddatafromtheI2Cbusasareceiver. I2C Bus Slave Address Acknowledge Signal Afterthemasterhastransmittedacallingaddress,anyslavedeviceontheI2Cbus,whose owninternaladdressmatchesthecallingaddress,mustgenerateanacknowledgesignal.The acknowledgesignalwillinformthemasterthataslavedevicehasaccepteditscallingaddress.Ifno acknowledgesignalisreceivedbythemasterthenaSTOPsignalmustbetransmittedbythemaster toendthecommunication.WhentheHAASflagishigh,theaddresseshavematchedandtheslave devicemustchecktheSRWflagtodetermineifitistobeatransmitterorareceiver.IftheSRWflag ishigh,theslavedeviceshouldbesetuptobeatransmittersotheHTXbitintheSIMC1register shouldbesetto"1".IftheSRWflagislow,thenthemicrocontrollerslavedeviceshouldbesetupas areceiverandtheHTXbitintheSIMC1registershouldbesetto"0". I2C Bus Data and Acknowledge Signal Thetransmitteddatais8-bitswideandistransmittedaftertheslavedevicehasacknowledgedreceipt ofitsslaveaddress.TheorderofserialbittransmissionistheMSBfirstandtheLSBlast.After receiptof8-bitsofdata,thereceivermusttransmitanacknowledgesignal,level"0",beforeitcan receivethenextdatabyte.Iftheslavetransmitterdoesnotreceiveanacknowledgebitsignalfrom themasterreceiver,thentheslavetransmitterwillreleasetheSDAlinetoallowthemastertosend aSTOPsignaltoreleasetheI2CBus.ThecorrespondingdatawillbestoredintheSIMDregister. Ifsetupasatransmitter,theslavedevicemustfirstwritethedatatobetransmittedintotheSIMD register.Ifsetupasareceiver,theslavedevicemustreadthetransmitteddatafromtheSIMDregister. Whentheslavereceiverreceivesthedatabyte,itmustgenerateanacknowledgebit,knownas TXAK,onthe9thclock.Theslavedevice,whichissetupasatransmitterwillchecktheRXAKbit intheSIMC1registertodetermineifitistosendanotherdatabyte,ifnotthenitwillreleasethe SDAlineandawaitthereceiptofaSTOPsignalfromthemaster. |
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