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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3230 데이터시트(PDF) 21 Page - Holtek Semiconductor Inc |
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HT45F3230 데이터시트(HTML) 21 Page - Holtek Semiconductor Inc |
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21 / 148 page  Rev. 1.00 20 January 13, 2017 Rev. 1.00 21 January 13, 2017 HT45F3230 IR Sensing/Motor Driving Flash MCU HT45F3230 IR Sensing/Motor Driving Flash MCU Flash Program Memory TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Forthedevicethe ProgramMemoryisFlashtype,whichmeansitcanbeprogrammedandre-programmedalarge numberoftimes,allowingtheusertheconvenienceofcodemodificationonthesamedevice.By usingtheappropriateprogrammingtools,theFlashdeviceoffersuserstheflexibilitytoconveniently debuganddeveloptheirapplicationswhilealsoofferingameansoffieldprogrammingand updating. Structure TheProgramMemoryhasacapacityof2K×16bits.TheProgramMemoryisaddressedbythe ProgramCounterandalsocontainsdata,tableinformationandinterruptentries.Tabledata,which canbesetupinanylocationwithintheProgramMemory,isaddressedbyaseparatetablepointer register. 000H Initialisation Vector 004H 7FFH 16 bits Interrupt Vectors 03CH Look-up Table n00H nFFH Program Memory Structure Special Vectors WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation 000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis initiated,theprogramwilljumptothislocationandbeginexecution. Look-up Table AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingtheaddress ofthelookupdatatoberetrievedinthetablepointerregister,TBLPandTBHP.Theseregisters definethetotaladdressofthelook-uptable. Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing the“TABRD[m]”or“TABRDL[m]”instructions,respectively.Whentheinstructionisexecuted, thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuserdefined DataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabytefrom theProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis transferredhigherorderbytewillbereadas0. Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable. |
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