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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HT66F4530 数据表(PDF) 132 Page - Holtek Semiconductor Inc |
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HT66F4530 数据表(HTML) 132 Page - Holtek Semiconductor Inc |
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132 / 224 page  Rev. 1.00 13� De�e��e� �1� �01� Rev. 1.00 133 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers Serial Interface Module – SIM ThesedevicescontainaSerialInterfaceModule,whichincludesboththefourlineSPIinterfaceand thetwolineI2Cinterfacetypes,toallowaneasymethodofcommunicationwithexternalperipheral hardware.Havingrelativelysimplecommunicationprotocols,theseserialinterfacetypesallow themicrocontrollertointerfacetoexternalSPIorI2Cbasedhardwaresuchassensors,Flashor EEPROMmemory,etc.TheSIMinterfacepinsarepin-sharedwithotherI/OpinsthereforetheSIM interfacefunctionalpinsmustfirstbeselectedusingthecorrespondingpin-sharedfunctionselection bits.Asbothinterfacetypessharethesamepinsandregisters,thechoiceofwhethertheSPIorI2C typeisusedismadeusingtheSIMoperatingmodecontrolbits,namedSIM2~SIM0,intheSIMC0 register.Thesepull-highresistorsoftheSIMpin-sharedI/Oareselectedusingpull-highcontrol registerswhentheSIMfunctionisenabledandthecorrespondingpinsareusedasSIMinputpins. SPI Interface TheSPIinterfaceisoftenusedtocommunicatewithexternalperipheraldevicessuchassensors, FlashorEEPROMmemorydevicesetc.OriginallydevelopedbyMotorola,thefourlineSPI interfaceisasynchronousserialdatainterfacethathasarelativelysimplecommunicationprotocol simplifyingtheprogrammingrequirementswhencommunicatingwithexternalhardwaredevices. Thecommunicationisfullduplexandoperatesasaslave/mastertype,wherethesedevicescanbe eithermasterorslave.AlthoughtheSPIinterfacespecificationcancontrolmultipleslavedevices fromasinglemaster,butthesedevicesprovideonlyoneSCSpin.Ifthemasterneedstocontrol multipleslavedevicesfromasinglemaster,themastercanuseI/Opintoselecttheslavedevices. SPI Interface Operation TheSPIinterfaceisafullduplexsynchronousserialdatalink.Itisafourlineinterfacewithpin namesSDI,SDO,SCKandSCS.PinsSDIandSDOaretheSerialDataInputandSerialDataOutput lines,theSCKpinistheSerialClocklineandSCSistheSlaveSelectline.AstheSPIinterfacepins arepin-sharedwithnormalI/OpinsandwiththeI2Cfunctionpins,theSPIinterfacepinsmustfirst beselectedbyconfiguringthepin-sharedfunctionselectionbitsandsettingthecorrectbitsinthe SIMC0andSIMC2registers.CommunicationbetweendevicesconnectedtotheSPIinterfaceis carriedoutinaslave/mastermodewithalldatatransferinitiationsbeingimplementedbythemaster. TheMasteralsocontrolstheclocksignal.AsthesedevicesonlycontainasingleSCSpinonlyone slavedevicecanbeutilized.TheSCSpiniscontrolledbysoftware,setCSENbitto1toenableSCS pinfunction,setCSENbitto0theSCSpinwillbefloatingstate. TheSPIfunctioninthesedevicesofferthefollowingfeatures: • Fullduplexsynchronousdatatransfer • BothMasterandSlavemodes • LSBfirstorMSBfirstdatatransmissionmodes • Transmissioncompleteflag • Risingorfallingactiveclockedge ThestatusoftheSPIinterfacepinsisdeterminedbyanumberoffactorssuchaswhetherthese devicesareinthemasterorslavemodeandupontheconditionofcertaincontrolbitssuchasCSEN andSIMEN. |
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