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HT45F3520 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc |
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HT45F3520 Datasheet(HTML) 22 Page - Holtek Semiconductor Inc |
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22 / 134 page  Rev. 1.10 �� De�e��e� 1�� �01� Rev. 1.10 �� De�e��e� 1�� �01� HT45F3520/HT45F3530 Personal Care Flash MCU HT45F3520/HT45F3530 Personal Care Flash MCU Special Vectors WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation 000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis initiated,theprogramwilljumptothislocationandbeginexecution. Look-up Table AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingtheaddress ofthelookupdatatoberetrievedinthetablepointerregister,TBLP.Thisregisterdefinesthetotal addressofthelook-uptable. Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing the"TABRDC[m]"or"TABRDL[m]"instructions,respectively.Whentheinstructionisexecuted, thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuserdefined DataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabytefrom theProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis transferredhigherorderbytewillbereadas"0". Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable. Re gi st er T BL H Us er S el ec te d Re gi st er Hi gh B yt eL ow B yt e PC H ig h By te TB LP R eg is te r Da ta 14 /1 5 bi ts Pr og ra m Me mo ry La st p age o r p re se nt p ag e (P C9 /P C1 0~ PC 8) Table Program Example Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfromthe microcontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichisstored thereusingtheORGstatement.ThevalueatthisORGstatementis"300H"whichreferstothestart addressofthelastpagewithinthe1KwordsProgramMemoryoftheHT45F3520.Thetablepointer issetupheretohaveaninitialvalueof"06H".Thiswillensurethatthefirstdatareadfromthedata tablewillbeattheProgramMemoryaddress"306H"or6locationsafterthestartofthelastpage. Notethatthevalueforthetablepointerisreferencedtothefirstaddressofthepresentpageifthe "TABRDC[m]"instructionisbeingused.Thehighbyteofthetabledatawhichinthiscaseisequal tozerowillbetransferredtotheTBLHregisterautomaticallywhenthe"TABRDC[m]"instruction isexecuted. BecausetheTBLHregisterisaread-onlyregisterandcannotberestored,careshouldbetaken toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire twoinstructioncyclestocompletetheiroperation. |
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