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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3W 데이터시트(PDF) 78 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 78 Page - Holtek Semiconductor Inc |
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78 / 167 page  Rev. 1.50 78 De�e��e� 01� �01� Rev. 1.50 79 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU Programming Considerations TheTMCounterRegistersandtheCapture/CompareCCRAregisters,beingeither10-bitor16-bit, allhavealowandhighbytestructure.Thehighbytescanbedirectlyaccessed,butasthelowbytes canonlybeaccessedviaaninternal8-bitbuffer,readingorwritingtotheseregisterpairsmustbe carriedoutinaspecificway.Theimportantpointtonoteisthatdatatransfertoandfromthe8-bit bufferanditsrelatedlowbyteonlytakesplacewhenawriteorreadoperationtoitscorresponding highbyteisexecuted. TM C oun te r Re gi st er ( Re ad o nl y) TM xD L TM xD H TM xA L TM xA H 8- bi t Bu ff er Da ta Bu s TM C CRA R eg is te r (R ead/ W ri te ) Thefollowingstepsshowthereadandwriteprocedures: • WritingDatatoCCRA ♦ Step1.WritedatatoLowByteTMxAL –Notethatheredataisonlywrittentothe8-bitbuffer. ♦ Step2.WritedatatoHighByteTMxAH –Heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched fromthe8-bitbuffertotheLowByteregisters. • ReadingDatafromtheCounterRegistersandCCRA ♦ Step1.ReaddatafromtheHighByteTMxDHorTMxAH –HeredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched fromtheLowByteregisterintothe8-bitbuffer. ♦ Step2.ReaddatafromtheLowByteTMxDLorTMxAL –Thisstepreadsdatafromthe8-bitbuffer. AstheCCRAregisterisimplementedinthewayshowninthefollowingdiagramandaccessing theregisteriscarriedoutinaspecificwaydescribedabove,itisrecommendedtousethe“MOV” instructiontoaccesstheCCRAlowbyteregister,namedTMxAL,usingthefollowingaccess procedures.AccessingtheCCRAlowbyteregisterwithoutfollowingtheseaccessprocedureswill resultinunpredictablevalues. |
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