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HT67F5652 bảng dữ liệu(PDF) 137 Page - Holtek Semiconductor Inc |
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HT67F5652 bảng dữ liệu(HTML) 137 Page - Holtek Semiconductor Inc |
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137 / 224 page  Rev. 1.00 13� De�e��e� 0�� �01� Rev. 1.00 13� De�e��e� 0�� �01� HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU Serial Interface Module – SIM ThisdevicecontainsaSerialInterfaceModule,whichincludesboththefourlineSPIinterfaceand thetwolineI2Cinterfacetypes,toallowaneasymethodofcommunicationwithexternalperipheral hardware.Havingrelativelysimplecommunicationprotocols,theseserialinterfacetypesallowthe microcontrollertointerfacetoexternalSPIorI2Cbasedhardwaresuchassensors,Flashmemory, etc.Asbothinterfacetypessharethesamepinsandregisters,thechoiceofwhethertheSPIorI2C typeisusedismadeusingtheSIMoperatingmodecontrolbits,namedSIM2~SIM0,intheSIMC0 register.Thesepull-highresistorsoftheSIMpin-sharedI/Opinsareselectedusingpull-highcontrol registerswhentheSIMfunctionisenabledandthecorrespondingpinsareusedasSIMinputpins. SPI Interface TheSPIinterfaceisoftenusedtocommunicatewithexternalperipheraldevicessuchassensors, Flashmemorydevicesetc.OriginallydevelopedbyMotorola,thefourlineSPIinterfaceisa synchronousserialdatainterfacethathasarelativelysimplecommunicationprotocolsimplifying theprogrammingrequirementswhencommunicatingwithexternalhardwaredevices. Thecommunicationisfullduplexandoperatesasaslave/mastertype,wherethedevicecanbe eithermasterorslave.AlthoughtheSPIinterfacespecificationcancontrolmultipleslavedevices fromasinglemaster,butthisdeviceisprovidedonlyoneSCSpin.Ifthemasterneedstocontrol multipleslavedevicesfromasinglemaster,themastercanuseI/Opintoselecttheslavedevices. SPI Interface Operation TheSPIinterfaceisafullduplexsynchronousserialdatalink.Itisafourlineinterfacewithpin namesSDI,SDO,SCKandSCS.PinsSDIandSDOaretheSerialDataInputandSerialDataOutput lines;SCKistheSerialClocklineandSCSistheSlaveSelectline.AstheSPIinterfacepinsarepin- sharedwithnormalI/OpinsandwiththeI2Cfunctionpins,theSPIinterfacemustfirstbeenabled bysettingthecorrectbitsintheSIMC0andSIMC2registers.TheSPIcanbedisabledorenabled usingtheSIMENbitintheSIMC0register.CommunicationbetweendevicesconnectedtotheSPI interfaceiscarriedoutinaslave/mastermodewithalldatatransferinitiationsbeingimplemented bythemaster.TheMasteralsocontrolstheclocksignal.AsthedeviceonlycontainsasingleSCS pinonlyoneslavedevicecanbeutilized.TheSCSpiniscontrolledbysoftware,setCSENbitto"1" toenableSCSpinfunction,setCSENbitto"0"theSCSpinwillbefloatingstate. TheSPIfunctioninthisdeviceoffersthefollowingfeatures: • Fullduplexsynchronousdatatransfer • BothMasterandSlavemodes • LSBfirstorMSBfirstdatatransmissionmodes • Transmissioncompleteflag • Risingorfallingactiveclockedge ThestatusoftheSPIinterfacepinsisdeterminedbyanumberoffactorssuchaswhetherthedeviceis inthemasterorslavemodeandupontheconditionofcertaincontrolbitssuchasCSENandSIMEN. SCK SPI Maste� SDO SDI SCS SCK SPI Slave SDI SDO SCS SPI Master/Slave Connection |
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