User`s guide

Rev. 1.10 98 November 14, 2014 Rev. 1.10 99 November 14, 2014
HT66FW2230
Wireless Charger A/D Flash 8-Bit MCU
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
   
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
  
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
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   

    
 
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  
   
 
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    
    
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I
2
C Bus Initialisation Flow Chart
I
2
C Bus Start Signal
TheSTARTsignalcanonlybegeneratedbythemasterdeviceconnectedtotheI
2
Cbusandnotby
theslavedevice.ThisSTARTsignalwillbedetectedbyalldevicesconnectedtotheI
2
Cbus.When
detected,thisindicatesthattheI
2
CbusisbusyandthereforetheIICHBBbitwillbeset.ASTART
conditionoccurswhenahightolowtransitionontheSDAlinetakesplacewhentheSCLline
remainshigh.
Slave Address
ThetransmissionofaSTARTsignalbythemasterwillbedetectedbyalldevicesontheI
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Cbus.
Todeterminewhichslavedevicethemasterwishestocommunicatewith,theaddressoftheslave
devicewillbesentoutimmediatelyfollowingtheSTARTsignal.Allslavedevices,afterreceiving
this7-bitaddressdata,willcompareitwiththeirown7-bitslaveaddress.Iftheaddresssentoutby
themastermatchestheinternaladdressofthemicrocontrollerslavedevice,thenaninternalI
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Cbus
interruptsignalwillbegenerated.Thenextbitfollowingtheaddress,whichisthe8thbit,denes
theread/writestatusandwillbesavedtotheIICSRWbitoftheIICC1register.Theslavedevicewill
thentransmitanacknowledgebit,whichisalowlevel,asthe9thbit.Theslavedevicewillalsoset
thestatusagIICHAASwhentheaddressesmatch.
AsanI
2
Cbusinterruptcancomefromtwosources,whentheprogramenterstheinterrupt
subroutine,theIICHAASbitshouldbeexaminedtoseewhethertheinterruptsourcehascome
fromamatchingslaveaddressorfromthecompletionofadatabytetransfer.Whenaslaveaddress
ismatched,thedevicemustbeplacedineitherthetransmitmodeandthenwritedatatotheIICD
register,orinthereceivemodewhereitmustimplementadummyreadfromtheIICDregisterto
releasetheSCLline.