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HT66F019 Datasheet(PDF) 120 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 120 Page - Holtek Semiconductor Inc |
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120 / 175 page  Rev. 1.00 1�0 De�e��e� 01� �01� Rev. 1.00 1�1 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM SPI Bus Enable/Disable ToenabletheSPIbus,setCSEN=1andSCS=0,thenwaitfordatatobewrittenintotheSIMD (TXRXbuffer)register.FortheMasterMode,afterdatahasbeenwrittentotheSIMD(TXRX buffer)register,thentransmissionorreceptionwillstartautomatically.Whenallthedatahasbeen transferred,theTRFbitshouldbeset.FortheSlaveMode,whenclockpulsesarereceivedonSCK, dataintheTXRXbufferwillbeshiftedoutordataonSDIwillbeshiftedin. WhentheSPIbusisdisabled,SCK,SDI,SDOandSCScanbecomeI/Opinsorotherpin-shared functionsusingthecorrespondingcontrolbits. SPI Operation Allcommunicationiscarriedoutusingthe4-lineinterfaceforeitherMasterorSlaveMode. TheCSENbitintheSIMC2registercontrolstheoverallfunctionoftheSPIinterface.Settingthis bithighwillenabletheSPIinterfacebyallowingtheSCSlinetobeactive,whichcanthenbeused tocontroltheSPIinterface.IftheCSENbitislow,theSPIinterfacewillbedisabledandtheSCS linewillbeinafloatingconditionandcanthereforenotbeusedforcontroloftheSPIinterface. IftheCSENbitandtheSIMENbitintheSIMC0aresethigh,thiswillplacetheSDIlineina floatingconditionandtheSDOlinehigh.IfinMasterModetheSCKlinewillbeeitherhighorlow dependingupontheclockpolarityselectionbitCKPOLBintheSIMC2register.IfinSlaveMode theSCKlinewillbeinafloatingcondition.IftheSIMENbitislow,thenthebuswillbedisabled andSCS,SDI,SDOandSCKwillallbecomeI/Opinsortheotherfunctionsusingthecorresponding controlbits.IntheMasterModetheMasterwillalwaysgeneratetheclocksignal.Theclockand datatransmissionwillbeinitiatedafterdatahasbeenwrittenintotheSIMDregister.IntheSlave Mode,theclocksignalwillbereceivedfromanexternalmasterdeviceforbothdatatransmission andreception.Thefollowingsequencesshowtheordertobefollowedfordatatransferinboth MasterandSlaveMode. Master Mode: • Step1 SelecttheSPIMastermodeandclocksourceusingtheSIM2~SIM0bitsintheSIMC0control register. • Step2 SetuptheCSENbitandsetuptheMLSbittochooseifthedataisMSBorLSBfirst,thissetting mustbethesamewiththeSlavedevices. • Step3 SetuptheSIMENbitintheSIMC0controlregistertoenabletheSPIinterface. • Step4 Forwriteoperations:writethedatatotheSIMDregister,whichwillactuallyplacethedatainto theTXRXbuffer.ThenusetheSCKandSCSlinestooutputthedata.Afterthis,gotostep5. Forreadoperations:thedatatransferredinontheSDIlinewillbestoredintheTXRXbuffer untilallthedatahasbeenreceivedatwhichpointitwillbelatchedintotheSIMDregister. • Step5 ChecktheWCOLbitifsethighthenacollisionerrorhasoccurredsoreturntostep4.Ifequalto zerothengotothefollowingstep. • Step6 ChecktheTRFbitorwaitforaSPIserialbusinterrupt. • Step7 ReaddatafromtheSIMDregister. |
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