ETIC 2230 Guía de usuario descargar pdf (Pagina 93)

Rev. 1.10 92 November 14, 2014 Rev. 1.10 93 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

C Interface

TheI

Cinterfaceisusedtocommunicatewithexternalperipheraldevicessuchassensors,

EEPROMmemoryetc.OriginallydevelopedbyPhilips,itisatwolinelowspeedserialinterface

forsynchronousserialdatatransfer.Theadvantageofonlytwolinesforcommunication,relatively

simplecommunicationprotocolandtheabilitytoaccommodatemultipledevicesonthesamebus

hasmadeitanextremelypopularinterfacetypeformanyapplications.



















C Master/Slave Bus Connection

C Interface Operation

TheI

Cserialinterfaceisatwolineinterface,aserialdataline,SDA,andserialclockline,SCL.As

manydevicesmaybeconnectedtogetheronthesamebus,theiroutputsarebothopendraintypes.

Forthisreasonitisnecessarythatexternalpull-highresistorsareconnectedtotheseoutputs.Note

thatnochipselectlineexists,aseachdeviceontheI

Cbusisidentiedbyauniqueaddresswhich

willbetransmittedandreceivedontheI

Cbus.

WhentwodevicescommunicatewitheachotheronthebidirectionalI

Cbus,oneisknownasthe

masterdeviceandoneastheslavedevice.Bothmasterandslavecantransmitandreceivedata,

however,itisthemasterdevicethathasoverallcontrolofthebus.Forthisdevice,whichonly

operatesinslavemode,therearetwomethodsoftransferringdataontheI

Cbus,theslavetransmit

modeandtheslavereceivemode.

ItissuggestedthattheusershallnotenterthemicroprocessortoHALTmodebyapplication

programduringprocessingI

Ccommunication.

IfthepinisconguredtoSDAorSCLfunctionofI

Cinterface,thepinisconguredtoopen-collect

Input/Outputportanditspull-upfunctioncanbeenabledbyprogrammingtherelatedGenericPull-

upControlRegister.

START signal

from M aste r

Send s la ve addre ss

and R/W bit from M aste r

A cknow le dge

from s la ve

S end data byte

from M aste r

A cknow l edge

from s la ve

STOP s ig nal

from M aste r

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