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HT82B42R Datasheet(PDF) 17 Page - Holtek Semiconductor Inc |
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HT82B42R Datasheet(HTML) 17 Page - Holtek Semiconductor Inc |
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17 / 86 page  Rev. 1.00 16 October 27, 2011 Rev. 1.00 17 October 27, 2011 HT82B42R/HT82B42RE I/O MCU with USB Interface Special Vectors WithintheProgramMemory,certainlocationsarereservedforspecialusagesuchasresetand interrupts. • Location000H Thisareaisreservedforprograminitialization.Afterchipreset,theprogramalwaysbegins executionatlocation000H. • Location004H ThisareaisreservedfortheUSBinterruptserviceprogram.IftheUSBinterruptisactivated, theinterruptisenabledandthestackisnotfull,theprogramjumpstothislocationandbegins execution. • Location008H ThisareaisreservedfortheTimer/EventCounter0interruptserviceprogram.Ifatimerinterrupt resultsfromaTimer/EventCounter0overflow,andiftheinterruptisenabledandthestackisnot full,theprogramjumpstothislocationandbeginsexecution. • Location00CH ThisareaisreservedfortheTimer/EventCounter1interruptserviceprogram.Ifatimerinterrupt resultsfromaTimer/EventCounter1overflow,andtheinterruptisenabledandthestackisnot full,theprogramjumpstothislocationandbeginsexecution. • Location010H ThisareaisreservedfortheSPIinterruptserviceprogram.IfaSPIinterruptresultsfromabyte ofdatahasbeentransmittedorreceivedbytheSPIinterface,andtheinterruptisenabledandthe stackisnotfull,theprogramjumpstothislocationandbeginsexecution. • Tablelocation Anylocationintheprogrammemorycanbeusedaslook-uptables.Therearethreemethodsto readtheProgramMemorydatausingtwotablereadinstructions:"TABRDC"and"TABRDL", transferthecontentsofthelower-orderbytetothespecifieddatamemory,andthehigher-order bytetoTBLH(08H). Thethreemethodsareshownasfollows: ♦ Usingtheinstruction"TABRDC[m]"forthecurrentProgramMemorypage,whereonepage= 256words,wherethetablelocationisdefinedbyTBLPinthecurrentpage.Thisiswherethe configurationoptionhasdisabledtheTBHPregister. ♦ Usingtheinstruction"TABRDC[m]",wherethetablelocationisdefinedbyregistersTBLP andTBHP.HeretheconfigurationoptionhasenabledtheTBHPregister. ♦ Usingtheinstruction"TABRDL[m]",wherethetablelocationisdefinedbyregistersTBLPin thelastpagewhichhastheaddressrange0F00H~0FFFH. Onlythedestinationofthelower-orderbyteinthetableiswell-defined,theotherbitsofthetable wordaretransferredtothelowerportionofTBLH,andtheremaining1-bitwordsarereadas"0". TheTableHigher-orderbyteregister(TBLH)isreadonly.Thetablepointers,TBLPandTBHP,are read/writeregisters,whichindicatethetablelocation.Beforeaccessingthethetable,thelocations mustbeplacedintheTBLPandTBHPregisters(iftheconfigurationoptionhasdisabledTBHPthen thevalueinTBHPhasnoeffect).TBLHisreadonlyandcannotberestored.Ifthemainroutine andtheISR(InterruptServiceRoutine)bothemploythetablereadinstruction,thecontentsofthe TBLHinthemainroutinearelikelytobechangedbythetablereadinstructionusedintheISRand errorscanoccur.UsingthetablereadinstructioninthemainroutineandtheISRsimultaneously shouldbeavoided.However,ifthetablereadinstructionhastobeappliedinboththemainroutine andtheISR,theinterruptshouldbedisabledpriortothetablereadinstruction.Itwillnotbeenabled untiltheTBLHhasbeenbackedup.Alltablerelatedinstructionsrequiretwocyclestocompletethe |
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