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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT69F360 датащи(PDF) 159 Page - Holtek Semiconductor Inc |
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HT69F360 датащи(HTML) 159 Page - Holtek Semiconductor Inc |
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159 / 235 page  Rev. 1.30 15� �ove��e� 1�� �01� Rev. 1.30 159 �ove��e� 1�� �01� HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM I2C Bus Start Signal TheSTARTsignalcanonlybegeneratedbythemasterdeviceconnectedtotheI2Cbusandnotby theslavedevice.ThisSTARTsignalwillbedetectedbyalldevicesconnectedtotheI2Cbus.When detected,thisindicatesthattheI2CbusisbusyandthereforetheHBBbitwillbeset.ASTART conditionoccurswhenahightolowtransitionontheSDAlinetakesplacewhentheSCLline remainshigh. 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”. |
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