HT66F20 datasheet(199/298 Pages) HOLTEK

199 / 298 page

Rev. 1.90

198

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Rev. 1.90

199

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

St ar t

Wr it e Sl av e

A ddr e ss to S IM A

SE T SI M[ 2: 0] =1 10

SE T SI ME N

I 2 C Bu s

In te rr up t= ?

Ye s

SE T SI ME a nd MF nE

Wa it f or In te rr upt

Go to M ai n Pr og ra m

CL R SI ME

Po ll S IM F to d ec i de

wh en t o go t o I 2 C Bu s IS R

Go to M ai n Pr og ra m

I2C Bus Initialisation Flow Chart

I2C Bus Start Signal

TheSTARTsignalcanonlybegeneratedbythemasterdeviceconnectedtotheI2Cbusandnotby

theslavedevice.ThisSTARTsignalwillbedetectedbyalldevicesconnectedtotheI2Cbus.When

detected,thisindicatesthattheI2CbusisbusyandthereforetheHBBbitwillbeset.ASTART

conditionoccurswhenahightolowtransitionontheSDAlinetakesplacewhentheSCLline

remainshigh.

Slave Address

ThetransmissionofaSTARTsignalbythemasterwillbedetectedbyalldevicesontheI2Cbus.

Todeterminewhichslavedevicethemasterwishestocommunicatewith,theaddressoftheslave

devicewillbesentoutimmediatelyfollowingtheSTARTsignal.Allslavedevices,afterreceiving

this7-bitaddressdata,willcompareitwiththeirown7-bitslaveaddress.Iftheaddresssentoutby

themastermatchestheinternaladdressofthemicrocontrollerslavedevice,thenaninternalI2Cbus

interruptsignalwillbegenerated.Thenextbitfollowingtheaddress,whichisthe8thbit,defines

theread/writestatusandwillbesavedtotheSRWbitoftheSIMC1register.Theslavedevicewill

thentransmitanacknowledgebit,whichisalowlevel,asthe9thbit.Theslavedevicewillalsoset

thestatusflagHAASwhentheaddressesmatch.

AsanI2Cbusinterruptcancomefromtwosources,whentheprogramenterstheinterrupt

subroutine,theHAASbitshouldbeexaminedtoseewhethertheinterruptsourcehascomefrom

amatchingslaveaddressorfromthecompletionofadatabytetransfer.Whenaslaveaddressis

matched,thedevicemustbeplacedineitherthetransmitmodeandthenwritedatatotheSIMD

releasetheSCLline.

HT66F20 Datasheet(PDF) 199 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 199 Page - Holtek Semiconductor Inc

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