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HT83B60 Datasheet(PDF) 45 Page - Holtek Semiconductor Inc |
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HT83B60 Datasheet(HTML) 45 Page - Holtek Semiconductor Inc |
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45 / 84 page  Rev. 1.00 44 De�e��e� 1�� �011 Rev. 1.00 45 De�e��e� 1�� �011 HT83B60 Voice Mask MCU HT83B60 Voice Mask MCU • SRWBit TheSRWbitintheSIMC1registerdefineswhetherthemicrocontrollerslavedevicewishes toreaddatafromtheI2CbusorwritedatatotheI2Cbus.Themicrocontrollershouldexamine thisbittodetermineifitistobeatransmitterorareceiver.IftheSRWbitissetto"1"thenthis indicatesthatthemasterwishestoreaddatafromtheI2Cbus,thereforethemicrocontrollerslave devicemustbesetuptosenddatatotheI2Cbusasatransmitter.IftheSRWbitis"0"thenthis indicatesthatthemasterwishestosenddatatotheI2Cbus,thereforethemicrocontrollerslave devicemustbesetuptoreaddatafromtheI2Cbusasareceiver. • AcknowledgeBit Afterthemasterhastransmittedacallingaddress,anyslavedeviceontheI2Cbus,whose owninternaladdressmatchesthecallingaddress,mustgenerateanacknowledgesignal.This acknowledgesignalwillinformthemasterthataslavedevicehasaccepteditscallingaddress.If noacknowledgesignalisreceivedbythemasterthenaSTOPsignalmustbetransmittedbythe mastertoendthecommunication.WhentheHAASbitishigh,theaddresseshavematchedand themicrocontrollerslavedevicemustchecktheSRWbittodetermineifitistobeatransmitter orareceiver.IftheSRWbitishigh,themicrocontrollerslavedeviceshouldbesetuptobea transmittersotheHTXbitintheSIMC1registershouldbesetto"1"iftheSRWbitislowthen themicrocontrollerslavedeviceshouldbesetupasareceiverandtheHTXbitintheSIMC1 registershouldbesetto"0". • DataByte Thetransmitteddatais8-bitswideandistransmittedaftertheslavedevicehasacknowledged receiptofitsslaveaddress.TheorderofserialbittransmissionistheMSBfirstandtheLSB last.Afterreceiptof8-bitsofdata,thereceivermusttransmitanacknowledgesignal,level"0", beforeitcanreceivethenextdatabyte.Ifthetransmitterdoesnotreceiveanacknowledgebit signalfromthereceiver,thenitwillreleasetheSDAlineandthemasterwillsendoutaSTOP signaltoreleasecontroloftheI2Cbus.ThecorrespondingdatawillbestoredintheSIMDR register.Ifsetupasatransmitter,themicrocontrollerslavedevicemustfirstwritethedatatobe transmittedintotheSIMDRregister.Ifsetupasareceiver,themicrocontrollerslavedevicemust readthetransmitteddatafromtheSIMDRregister. SC L SD A St ar t b it D at a s ta bl e Da ta al lo w ch an g e St op b it Data Timing Diagram • ReceiveAcknowledgeBit Whenthereceiverwishestocontinuetoreceivethenextdatabyte,itmustgeneratean acknowledgebit,knownasTXAK,onthe9thclock.Themicrocontrollerslavedevice,whichis setupasatransmitterwillchecktheRXAKbitintheSIMC1registertodetermineifitistosend anotherdatabyte,ifnotthenitwillreleasetheSDAlineandawaitthereceiptofaSTOPsignal fromthemaster. |
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