HT66F20 datasheet(198/298 Pages) HOLTEK

198 / 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

I 2 C Da ta R eg is te r

(S IM D)

Sl av e Ad dr e ss Re gi st er

(S IM A)

Sh i ft R egi st er

Di re ct i on Co nt ro l

A ddr e ss Ma tc h

HA AS B it

I 2 C In te rr up t

Da ta i n LS B

Da ta O ut M SB

Tr ans mi t/R ec ei ve

C ont ro l Un it

8- bi t D at a Co mp le te

De te c t S ta rt o r St op

Da ta B us

A ddr es s

Co mp ar at or

E nabl e/ Di s abl e A ck now le dge

R ead/ wr it e Sl av e

SR W Bi t

HB B Bi t

HT X Bi t

HC F Bi t

De b ounc e

Ci rc ui tr y

SC L Pi n

SD A Pi n

C onf i gur at io n

Op ti on s

I2C Block Diagram

I2C Bus Communication

CommunicationontheI2Cbusrequiresfourseparatesteps,aSTARTsignal,aslavedeviceaddress

transmission,adatatransmissionandfinallyaSTOPsignal.WhenaSTARTsignalisplacedon

theI2Cbus,alldevicesonthebuswillreceivethissignalandbenotifiedoftheimminentarrivalof

dataonthebus.Thefirstsevenbitsofthedatawillbetheslaveaddresswiththefirstbitbeingthe

MSB.Iftheaddressoftheslavedevicematchesthatofthetransmittedaddress,theHAASbitinthe

SIMC1registerwillbesetandanI2Cinterruptwillbegenerated.Afterenteringtheinterruptservice

routine,theslavedevicemustfirstchecktheconditionoftheHAASbittodeterminewhetherthe

interruptsourceoriginatesfromanaddressmatchorfromthecompletionofan8-bitdatatransfer.

Duringadatatransfer,notethatafterthe7-bitslaveaddresshasbeentransmitted,thefollowingbit,

whichisthe8thbit,istheread/writebitwhosevaluewillbeplacedintheSRWbit.Thisbitwillbe

checkedbytheslavedevicetodeterminewhethertogointotransmitorreceivemode.Beforeany

transferofdatatoorfromtheI2Cbus,themicrocontrollermustinitialisethebus,thefollowingare

stepstoachievethis:

• Step1

SettheSIM2~SIM0andSIMENbitsintheSIMC0registerto“1”toenabletheI2Cbus.

• Step2

WritetheslaveaddressofthedevicetotheI2CbusaddressregisterSIMA.

• Step3

SettheSIMEandSIMMuti-Functioninterruptenablebitoftheinterruptcontrolregisterto

enabletheSIMinterruptandMulti-functioninterrupt.

HT66F20 Datasheet(PDF) 198 Page - Holtek Semiconductor Inc

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