HT83B60 datasheet(43/84 Pages) HOLTEK

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HT83B60

Voice Mask MCU

HT83B60

Voice Mask MCU

• RXAKA/B

TheRXAKA/Bflagisthereceiveacknowledgeflag.WhentheRXAKA/Bbithasbeenresetto

zeroitmeansthatacorrectacknowledgesignalhasbeenreceivedatthe9thclock,after8bits

ofdatahavebeentransmitted.Wheninthetransmitmode,thetransmittercheckstheRXAKA/

Bbittodetermineifthereceiverwishestoreceivethenextbyte.Thetransmitterwilltherefore

continuesendingoutdatauntiltheRXAKA/Bbitissetto"1".Whenthisoccurs,thetransmitter

willreleasetheSDAA/BlinetoallowthemastertosendaSTOPsignaltoreleasethebus.

ST AR T si gnal

fr om M as te r

S end sl av e a ddr es s

and R/ W bi t f ro m Ma st er

Ac kn ow le dge

fr om s la ve

Se nd d at a by te

fr om M as te r

Ac kn ow le dg e

fr om s la ve

ST OP s i gnal

fr om M as te r

I2C Bus Communication

CommunicationontheI2Cbusrequiresfourseparatesteps,aSTARTsignal,aslavedeviceaddress

transmission,adatatransmissionandfinallyaSTOPsignal.WhenaSTARTsignalisplacedonthe

I2Cbus,alldevicesonthebuswillreceivethissignalandbenotifiedoftheimminentarrivalofdata

onthebus.ThefirstsevenbitsofthedatawillbetheslaveaddresswiththefirstbitbeingtheMSB.

Iftheaddressofthemicrocontrollermatchesthatofthetransmittedaddress,theHAASbitinthe

SIMC1registerwillbesetandanI2Cinterruptwillbegenerated.Afterenteringtheinterruptservice

routine,themicrocontrollerslavedevicemustfirstchecktheconditionoftheHAASbittodetermine

whethertheinterruptsourceoriginatesfromanaddressmatchorfromthecompletionofan8-bit

datatransfer.Duringadatatransfer,notethatafterthe7-bitslaveaddresshasbeentransmitted,the

followingbit,whichisthe8thbit,istheread/writebitwhosevaluewillbeplacedintheSRWbit.

Thisbitwillbecheckedbythemicrocontrollertodeterminewhethertogointotransmitorreceive

mode.BeforeanytransferofdatatoorfromtheI2Cbus,themicrocontrollermustinitialisethebus,

thefollowingarestepstoachievethis:

Step1

WritetheslaveaddressofthemicrocontrollertotheI2CbusaddressregisterSIMAR.

Step2

SettheSIMENbitintheSIMC0registerto"1"toenabletheI2Cbus.

Step3

SettheEHIbitoftheinterruptcontrolregistertoenabletheI2Cbusinterrupt.

HT83B60 Datasheet(PDF) 43 Page - Holtek Semiconductor Inc

HT83B60 Datasheet(HTML) 43 Page - Holtek Semiconductor Inc

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