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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F65 데이터시트(PDF) 28 Page - Holtek Semiconductor Inc |
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HT45F65 데이터시트(HTML) 28 Page - Holtek Semiconductor Inc |
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28 / 231 page  Rev. 1.60 �8 �ove��e� ��� �01� Rev. 1.60 �9 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU 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. R egi st er T BL H Us er S el ec te d R egi st er Hi gh By te Low B yt e TB LP R egi st er Da ta 16 bi ts Pr og ra m Me mo ry Las t page or TB HP R eg is te r Table Program Example Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfromthe microcontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichisstored thereusingtheORGstatement.ThevalueatthisORGstatementis"7F00H"whichreferstothestart addressofthelastpagewithinthe32KProgramMemoryoftheHT45F67.Thetablepointerissetup heretohaveaninitialvalueof"06H".Thiswillensurethatthefirstdatareadfromthedatatablewill beattheProgramMemoryaddress"7F06H"or6locationsafterthestartofthelastpage.Notethat thevalueforthetablepointerisreferencedtothefirstaddressofthepresentpageifthe"TABRD[m]" instructionisbeingused.Thehighbyteofthetabledatawhichinthiscaseisequaltozerowillbe transferredtotheTBLHregisterautomaticallywhenthe"TABRD[m]"instructionisexecuted. BecausetheTBLHregisterisaread-onlyregisterandcannotberestored,careshouldbetaken toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire twoinstructioncyclestocompletetheiroperation. |
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