ETIC 2230 Guia do Utilizador descarregar pdf (Página 98)

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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C Bus Initialisation Flow Chart

C Bus Start Signal

TheSTARTsignalcanonlybegeneratedbythemasterdeviceconnectedtotheI

Cbusandnotby

theslavedevice.ThisSTARTsignalwillbedetectedbyalldevicesconnectedtotheI

Cbus.When

detected,thisindicatesthattheI

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

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

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

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

releasetheSCLline.

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 147 148

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