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HT46R003B Scheda tecnica(PDF) 13 Page - Holtek Semiconductor Inc |
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HT46R003B Scheda tecnica(HTML) 13 Page - Holtek Semiconductor Inc |
13 / 76 page Rev. 1.00 1� ��ne 1�� �01� Rev. 1.00 13 ��ne 1�� �01� HT46R003B Cost-Effective A/D 8-bit OTP MCU HT46R003B Cost-Effective A/D 8-bit OTP MCU Program Memory TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Thedeviceis suppliedwithOne-TimeProgrammable,OTP,memorywhereuserscanprogramtheirapplication codeintothedevice.Byusingtheappropriateprogrammingtools,OTPdeviceoffersusersthe flexibilitytofreelydeveloptheirapplicationswhichmaybeusefulduringdebugorforproducts requiringfrequentupgradesorprogramchanges. Structure TheProgramMemoryhasacapacityof1K×14bits.TheProgramMemoryisaddressedbythe ProgramCounterandalsocontainsdata,tableinformationandinterruptentriesinformation.Table data,whichcanbesetinanylocationwithintheProgramMemory,isaddressedbyseparatetable pointerregister. 000H Initialisation Vector 00�H 3FFH 1� bits Interr�pt Vectors 010H Look-�p Table n00H nFFH Program Memory Structure Special Vectors WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation 000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis initiated,theprogramwilljumptothislocationandbeginexecution. Look-up Table AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetbyplacingtheaddress ofthelookupdatatoberetrievedinthetablepointerregister,TBLP.Thisregisterdefinesthetotal addressofthelook-uptable. Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemory usingthe“TABRDC[m]”or“TABRDL[m]”instructions,respectively.Whentheinstructionis executed,thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuser definedDataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabyte fromtheProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis transferredhigherorderbytewillbereadas“0”. Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable. |
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