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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F2020 датащи(PDF) 44 Page - Holtek Semiconductor Inc |
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HT45F2020 датащи(HTML) 44 Page - Holtek Semiconductor Inc |
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44 / 85 page  Rev. 1.00 44 April 11, 2017 Rev. 1.00 45 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Programming Considerations TheTMCounterRegistersandtheCapture/CompareCCRAandCCRPregisters,allhavealow andhighbytestructure.Thehighbytescanbedirectlyaccessed,butasthelowbytescanonlybe accessedviaaninternal8-bitbuffer,readingorwritingtotheseregisterpairsmustbecarriedoutin aspecificway.Theimportantpointtonoteisthatdatatransfertoandfromthe8-bitbufferandits relatedlowbyteonlytakesplacewhenawriteorreadoperationtoitscorrespondinghighbyteis executed. AstheCCRAandCCRPregistersareimplementedinthewayshowninthefollowingdiagramand accessingtheseregisterpairsiscarriedoutinaspecificwayasdescribedabove,itisrecommended tousethe“MOV”instructiontoaccesstheCCRAandCCRPlowbyteregisters,namedPTMALand PTMRPL,usingthefollowingaccessprocedures.AccessingtheCCRAorCCRPlowbyteregisters withoutfollowingtheseaccessprocedureswillresultinunpredictablevalues. Data Bus 8-bit Buffer PTMDH PTMDL PTMAH PTMAL PTM Counter Register (Read only) PTM CCRA Register (Read/Write) PTMRPH PTMRPL PTM CCRP Register (Read/Write) Thefollowingstepsshowthereadandwriteprocedures: • WritingDatatoCCRAorCCRP ♦ Step1.WritedatatoLowBytePTMALorPTMRPL – notethatheredataisonlywrittentothe8-bitbuffer. ♦ Step2.WritedatatoHighBytePTMAHorPTMRPH – heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched fromthe8-bitbuffertotheLowByteregisters. • ReadingDatafromtheCounterRegistersandCCRAorCCRP ♦ Step1.ReaddatafromtheHighBytePTMDH,PTMAHorPTMRPH – heredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched fromtheLowByteregisterintothe8-bitbuffer. ♦ Step2.ReaddatafromtheLowBytePTMDL,PTMALorPTMRPL – thisstepreadsdatafromthe8-bitbuffer. |
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