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HT66F019 Datasheet(PDF) 128 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 128 Page - Holtek Semiconductor Inc |
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128 / 175 page  Rev. 1.00 1�8 De�e��e� 01� �01� Rev. 1.00 1�9 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM 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-bitswideandistransmittedaftertheslavedevicehasacknowledged receiptofitsslaveaddress.TheorderofserialbittransmissionistheMSBfirstandtheLSBlast. Afterreceiptof8-bitsofdata,thereceivermusttransmitanacknowledgesignal,level"0",before itcanreceivethenextdatabyte.Iftheslavetransmitterdoesnotreceiveanacknowledgebitsignal fromthemasterreceiver,thentheslavetransmitterwillreleasetheSDAlinetoallowthemaster tosendaSTOPsignaltoreleasetheI2CBus.ThecorrespondingdatawillbestoredintheSIMD register.Ifsetupasatransmitter,theslavedevicemustfirstwritethedatatobetransmittedintothe SIMDregister.Ifsetupasareceiver,theslavedevicemustreadthetransmitteddatafromtheSIMD register. Whentheslavereceiverreceivesthedatabyte,itmustgenerateanacknowledgebit,knownas TXAK,onthe9thclock.Theslavedevice,whichissetupasatransmitterwillchecktheRXAKbit intheSIMC1registertodetermineifitistosendanotherdatabyte,ifnotthenitwillreleasethe SDAlineandawaitthereceiptofaSTOPsignalfromthemaster. Sta�t SCL SDA SCL SDA 1 S=Sta�t (1 �it) SA=Slave Add�ess (� �its) SR=SRW �it (1 �it) M=Slave devi�e send a�knowledge �it (1 �it) D=Data (8 �its) A=ACK (RXAK �it fo� t�ans�itte�� TXAK �it fo� �e�eive�� 1 �it) P=Stop (1 �it) 0 ACK Slave Add�ess SRW Stop Data ACK 11 0 10 10 10 01 01 00 S SA SR M D A D A …… S SA SR M D A D A …… P I2C Communication Timing Diagram Note:Whenaslaveaddressismatched,thedevicemustbeplacedineitherthetransmitmode andthenwritedatatotheSIMDregister,orinthereceivemodewhereitmustimplementa dummyreadfromtheSIMDregistertoreleasetheSCLline. |
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