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HT66F20 Datasheet(PDF) 193 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 193 Page - Holtek Semiconductor Inc |
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193 / 298 page  Rev. 1.90 19� �e���a�� 18� �01� Rev. 1.90 19� �e���a�� 18� �01� 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 I2C Interface TheI2Cinterfaceisusedtocommunicatewithexternalperipheraldevicessuchassensors, EEPROMmemoryetc.OriginallydevelopedbyPhilips,itisatwolinelowspeedserialinterface forsynchronousserialdatatransfer.Theadvantageofonlytwolinesforcommunication,relatively simplecommunicationprotocolandtheabilitytoaccommodatemultipledevicesonthesamebus hasmadeitanextremelypopularinterfacetypeformanyapplications. De vi ce Sl av e De vi ce Ma st er De vi ce Sl av e VD D SD A SC L I2C Master Slave Bus Connection I2C Interface Operation TheI2Cserialinterfaceisatwolineinterface,aserialdataline,SDA,andserialclockline,SCL.As manydevicesmaybeconnectedtogetheronthesamebus,theiroutputsarebothopendraintypes. Forthisreasonitisnecessarythatexternalpull-highresistorsareconnectedtotheseoutputs.Note thatnochipselectlineexists,aseachdeviceontheI2Cbusisidentifiedbyauniqueaddresswhich willbetransmittedandreceivedontheI2Cbus. WhentwodevicescommunicatewitheachotheronthebidirectionalI2Cbus,oneisknownasthe masterdeviceandoneastheslavedevice.Bothmasterandslavecantransmitandreceivedata, however,itisthemasterdevicethathasoverallcontrolofthebus.Forthesedevices,whichonly operatesinslavemode,therearetwomethodsoftransferringdataontheI2Cbus,theslavetransmit modeandtheslavereceivemode. ThereareseveralconfigurationoptionsassociatedwiththeI2Cinterface.Oneoftheseistoenable thefunctionwhichselectstheSIMpinsratherthannormalI/Opins.Notethatiftheconfiguration optiondoesnotselecttheSIMfunctionthentheSIMENbitintheSIMC0registerwillhaveno effect.AconfigurationoptiondeterminesthedebouncetimeoftheI2Cinterface.Thisusesthe systemclocktoineffectaddadebouncetimetotheexternalclocktoreducethepossibilityof glitchesontheclocklinecausingerroneousoperation.Thedebouncetime,ifselected,canbe chosentobeeither2or4systemclocks.ToachievetherequiredI2Cdatatransferspeed,there existsarelationshipbetweenthesystemclock,fSYS,andtheI2Cdebouncetime.ForeithertheI2C StandardorFastmodeoperation,usersmusttakecareoftheselectedsystemclockfrequencyand theconfigureddebouncetimetomatchthecriterionshowninthefollowingtable. I2C Debounce Time Selection I2C Standard Mode (100kHz) I2C Fast Mode (400kHz) No de�o�nce fSYS > �MHz fSYS > 5MHz � s�stem clock de�o�nce fSYS > 4MHz fSYS > 10MHz 4 s�stem clock de�o�nce fSYS > 8MHz fSYS > �0MHz I2C Minimum fSYS Frequency |
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