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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HT66F4530 数据表(PDF) 91 Page - Holtek Semiconductor Inc |
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HT66F4530 数据表(HTML) 91 Page - Holtek Semiconductor Inc |
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91 / 224 page  Rev. 1.00 90 De�e��e� �1� �01� Rev. 1.00 91 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 Programming Considerations TheTMCounterRegistersandtheCapture/CompareCCRAandCCRPregisters,allhavealow andhighbytestructure.Thehighbytescanbedirectlyaccessed,butasthelowbytescanonlybe accessedviaaninternal8-bitbuffer,readingorwritingtotheseregisterpairsmustbecarriedoutin aspecificway.Theimportantpointtonoteisthatdatatransfertoandfromthe8-bitbufferandits relatedlowbyteonlytakesplacewhenawriteorreadoperationtoitscorrespondinghighbyteis executed. AstheCCRAandCCRPregistersareimplementedinthewayshowninthefollowingdiagramand accessingtheseregisterpairsiscarriedoutinaspecificwayasdescribedabove,itisrecommended tousethe"MOV"instructiontoaccesstheCCRAandCCRPlowbyteregisters,namedxTMnAL andPTMnRPL,usingthefollowingaccessprocedures.AccessingtheCCRAorCCRPlowbyte registerswithoutfollowingtheseaccessprocedureswillresultinunpredictablevalues. Data Bus 8-�it Buffe� xTMnDH xTMnDL xTMnAH xTMnAL xTMn Counte� Registe� (Read only) xTMn CCRA Registe� (Read/W�ite) PTMnRPH PTMnRPL PTMn CCRP Registe� (Read/W�ite) Thefollowingstepsshowthereadandwriteprocedures: • WritingDatatoCCRAorCCRP ♦ Step1.WritedatatoLowBytexTMnALorPTMnRPL – Notethatheredataisonlywrittentothe8-bitbuffer. ♦ Step2.WritedatatoHighBytexTMnAHorPTMnRPH – Heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched fromthe8-bitbuffertotheLowByteregisters. • ReadingDatafromtheCounterRegisters,CCRAorCCRP ♦ Step1.ReaddatafromtheHighBytexTMnDH,xTMnAHorPTMnRPH – HeredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched fromtheLowByteregisterintothe8-bitbuffer. ♦ Step2.ReaddatafromtheLowBytexTMnDL,xTMnALorPTMnRPL – Thisstepreadsdatafromthe8-bitbuffer. |
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