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HT66F4530 Datasheet(PDF) 35 Page - Holtek Semiconductor Inc |
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HT66F4530 Datasheet(HTML) 35 Page - Holtek Semiconductor Inc |
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35 / 224 page  Rev. 1.00 34 De�e��e� �1� �01� Rev. 1.00 35 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers Look-up Table AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingtheaddress ofthelookupdatatoberetrievedinthetablepointerregisters,TBLPandTBHP.Theseregisters definethetotaladdressofthelook-uptable. Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing thecorrespondingtablereadinstructionsuchas"TABRD[m]"or"TABRDL[m]"respectivelywhen thememory[m]islocatedinsector0.Ifthememory[m]islocatedinothersectors,thedatacanbe retrievedfromtheprogrammemoryusingthecorrespondingextendedtablereadinstructionsuchas "LTABRD[m]"or"LTABRDL[m]"respectively.Whentheinstructionisexecuted,thelowerorder tablebytefromtheProgramMemorywillbetransferredtotheuserdefinedDataMemoryregister[m] asspecifiedintheinstruction.ThehigherordertabledatabytefromtheProgramMemorywillbe transferredtotheTBLHspecialregister. Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable. Last Page o� TBHP Registe� TBLP Registe� P�og�a� Me�o�y Registe� TBLH Use� Sele�ted Registe� Data 1� �its High Byte Low Byte Table Program Example Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfromthe microcontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichisstored thereusingtheORGstatement.ThevalueatthisORGstatementis"0700H"whichreferstothe startaddressofthelastpagewithinthe2KProgramMemoryoftheHT66F4530device.Thetable pointerlowbyteregisterissetupheretohaveaninitialvalueof"06H".Thiswillensurethatthefirst datareadfromthedatatablewillbeattheProgramMemoryaddress"0706H"or6locationsafter thestartofthelastpage.Notethatthevalueforthetablepointerisreferencedtothefirstaddress specifiedbyTBLPandTBHPifthe"TABRD[m]"or"LTABRD[m]"instructionisbeingused.The highbyteofthetabledatawhichinthiscaseisequaltozerowillbetransferredtotheTBLHregister automaticallywhenthe"TABRD[m]"or"LTABRD[m]"instructionisexecuted. BecausetheTBLHregisterisaread/writeregisterandcanberestored,careshouldbetaken toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire twoinstructioncyclestocompletetheiroperation. |
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