User`s guide

Rev. 1.10 96 November 14, 2014 Rev. 1.10 97 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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 
I
2
C Block Diagram
I
2
C Bus Communication
CommunicationontheI
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Cbusrequiresfourseparatesteps,aSTARTsignal,aslavedeviceaddress
transmission,adatatransmissionandnallyaSTOPsignal.WhenaSTARTsignalisplacedonthe
I
2
Cbus,alldevicesonthebuswillreceivethissignalandbenotiedoftheimminentarrivalofdata
onthebus.TherstsevenbitsofthedatawillbetheslaveaddresswiththerstbitbeingtheMSB.
Iftheaddressoftheslavedevicematchesthatofthetransmittedaddress,theIICHAASbitinthe
IICC1registerwillbesetandanI
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Cinterruptwillbegenerated.Afterenteringtheinterruptservice
routine,theslavedevicemustrstchecktheconditionoftheIICHAASbittodeterminewhetherthe
interruptsourceoriginatesfromanaddressmatchorfromthecompletionofan8-bitdatatransfer.
Duringadatatransfer,notethatafterthe7-bitslaveaddresshasbeentransmitted,thefollowingbit,
whichisthe8thbit,istheread/writebitwhosevaluewillbeplacedintheSRWbit.Thisbitwillbe
checkedbytheslavedevicetodeterminewhethertogointotransmitorreceivemode.Beforeany
transferofdatatoorfromtheI
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Cbus,themicrocontrollermustinitialisethebus,thefollowingare
stepstoachievethis:
• Step1
SetCongurethepin-sharedI/OportstoI
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Cpinfunction.(SCLandSDA).
• Step2
SetI2CENbitintheIICC0registerto“1”toenabletheI
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Cbus.
• Step3
WritetheslaveaddressofthedevicetotheI
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CbusaddressregisterIICA.
• Step4
SettheIICEinterruptenablebitoftheinterruptcontrolregistertoenabletheI
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Cinterruptand
Multi-functioninterrupt.