HT45F75 datasheet(126/190 Pages) HOLTEK

126 / 190 page

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

I2C Bus Slave Address Acknowledge Signal

Afterthemasterhastransmittedacallingaddress,anyslavedeviceontheI2Cbus,whose

owninternaladdressmatchesthecallingaddress,mustgenerateanacknowledgesignal.The

acknowledgesignalwillinformthemasterthataslavedevicehasaccepteditscallingaddress.Ifno

acknowledgesignalisreceivedbythemasterthenaSTOPsignalmustbetransmittedbythemaster

toendthecommunication.WhentheHAASflagishigh,theaddresseshavematchedandtheslave

devicemustchecktheSRWflagtodetermineifitistobeatransmitterorareceiver.IftheSRWflag

ishigh,theslavedeviceshouldbesetuptobeatransmittersotheHTXbitintheSIMC1register

shouldbesethigh.IftheSRWflagislow,thenthemicrocontrollerslavedeviceshouldbesetupasa

receiverandtheHTXbitintheSIMC1registershouldbeclearedtozero.

I2C Bus Data and Acknowledge Signal

Thetransmitteddatais8-bitswideandistransmittedaftertheslavedevicehasacknowledged

receiptofitsslaveaddress.TheorderofserialbittransmissionistheMSBfirstandtheLSBlast.

Afterreceiptof8-bitsofdata,thereceivermusttransmitanacknowledgesignal,level“0”,before

itcanreceivethenextdatabyte.Iftheslavetransmitterdoesnotreceiveanacknowledgebitsignal

fromthemasterreceiver,thentheslavetransmitterwillreleasetheSDAlinetoallowthemaster

tosendaSTOPsignaltoreleasetheI2CBus.ThecorrespondingdatawillbestoredintheSIMD

SIMDregister.Ifsetupasareceiver,theslavedevicemustreadthetransmitteddatafromtheSIMD

Whentheslavereceiverreceivesthedatabyte,itmustgenerateanacknowledgebit,knownas

TXAK,onthe9thclock.Theslavedevice,whichissetupasatransmitterwillchecktheRXAKbit

intheSIMC1registertodetermineifitistosendanotherdatabyte,ifnotthenitwillreleasethe

SDAlineandawaitthereceiptofaSTOPsignalfromthemaster.

Da ta

01010

S= St ar t ( 1 bi t)

SA =S la ve A dd re ss ( 7 bi ts )

SR =S RW b it ( 1 bi t)

M= Sl av e de vi ce s end a ckn ow le dge bi t (1 b it )

D= Da ta ( 8 bi ts )

A= AC K ( RX AK b it f or tr an sm i tte r, T XAK b it fo r re ce iv er 1 b it )

P= St op ( 1 bi t)

SC L

St ar t

SD A

SR W

AC K

St op

SC L

SD A

Sl av e Ad dr es s

SS AS R

I2C Communication Timing Diagram

Note:*Whenaslaveaddressismatched,thedevicemustbeplacedineitherthetransmitmode

andthenwritedatatotheSIMDregister,orinthereceivemodewhereitmustimplementa

dummyreadfromtheSIMDregistertoreleasetheSCLline.

HT45F75 Datasheet(PDF) 126 Page - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 126 Page - Holtek Semiconductor Inc

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