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HT66F019 Datasheet(PDF) 64 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 64 Page - Holtek Semiconductor Inc |
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64 / 175 page  Rev. 1.00 64 De�e��e� 01� �01� Rev. 1.00 65 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Programming Considerations TheTMCounterRegistersandtheCapture/CompareCCRAandCCRPregisters,allhavealow andhighbytestructure.Thehighbytescanbedirectlyaccessed,butasthelowbytescanonlybe accessedviaaninternal8-bitbuffer,readingorwritingtotheseregisterpairsmustbecarriedoutin aspecificway.Theimportantpointtonoteisthatdatatransfertoandfromthe8-bitbufferandits relatedlowbyteonlytakesplacewhenawriteorreadoperationtoitscorrespondinghighbyteis executed. AstheCCRAandCCRPregistersareimplementedinthewayshowninthefollowingdiagramand accessingtheseregisterpairsiscarriedoutinaspecificwayasdescribedabove,itisrecommended tousethe"MOV"instructiontoaccesstheCCRAandCCRPlowbyteregisters,namedxTMALand PTMRPL,usingthefollowingaccessprocedures.AccessingtheCCRAorCCRPlowbyteregisters withoutfollowingtheseaccessprocedureswillresultinunpredictablevalues. Data Bus 8-�it Buffe� xTMDH xTMDL xTMAH xTMAL xTM Counte� Registe� (Read only) xTM CCRA Registe� (Read/W�ite) PTMRPH PTMRPL PTM CCRP Registe� (Read/W�ite) Thefollowingstepsshowthereadandwriteprocedures: • WritingDatatoCCRAorCCRP ♦ Step1.WritedatatoLowBytexTMALorPTMRPL – Notethatheredataisonlywrittentothe8-bitbuffer. ♦ Step2.WritedatatoHighBytexTMAHorPTMRPH – Heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched fromthe8-bitbuffertotheLowByteregisters. • ReadingDatafromtheCounterRegistersandCCRAorCCRP ♦ Step1.ReaddatafromtheHighBytexTMDH,xTMAHorPTMRPH – HeredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched fromtheLowByteregisterintothe8-bitbuffer. ♦ Step2.ReaddatafromtheLowBytexTMDL,xTMALorPTMRPL – Thisstepreadsdatafromthe8-bitbuffer. |
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