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HT48R068B Arkusz danych(PDF) 87 Page - Holtek Semiconductor Inc |
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HT48R068B Arkusz danych(HTML) 87 Page - Holtek Semiconductor Inc |
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87 / 118 page  Rev. 1.30 86 �e���a�� 0�� �01� Rev. 1.30 87 �e���a�� 0�� �01� HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU 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-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. |
Podobny numer części - HT48R068B_15 |
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Podobny opis - HT48R068B_15 |
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