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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F65 데이터시트(PDF) 93 Page - Holtek Semiconductor Inc |
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HT45F65 데이터시트(HTML) 93 Page - Holtek Semiconductor Inc |
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93 / 231 page  Rev. 1.60 9� �ove��e� ��� �01� Rev. 1.60 93 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Programming Considerations TheTMCounterRegistersandtheCapture/CompareCCRAandCCRBregisters,beingeither10- bitor16-bit,allhavealowandhighbytestructure.Thehighbytescanbedirectlyaccessed,butas thelowbytescanonlybeaccessedviaaninternal8-bitbuffer,readingorwritingtotheseregister pairsmustbecarriedoutinaspecificway.Theimportantpointtonoteisthatdatatransfertoand fromthe8-bitbufferanditsrelatedlowbyteonlytakesplacewhenawriteorreadoperationtoits correspondinghighbyteisexecuted. TM C ount er R eg is te r (R ead on ly ) TM xD L TM xD H TM xA L TM xA H 8- bi t Bu ff er TM CCRB R eg is te r (R ead/ W ri te ) Da ta Bu s TM xB L TM xB H TM C CR A Re gi st er ( R ead/ W ri te ) Thefollowingstepsshowthereadandwriteprocedures: • WritingDatatoCCRBorCCRA ♦ Step1.WritedatatoLowByteTMxALorTMxBL –Notethatheredataisonlywrittentothe8-bitbuffer. ♦ Step2.WritedatatoHighByteTMxAHorTMxBH –Heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched fromthe8-bitbuffertotheLowByteregisters. • ReadingDatafromtheCounterRegistersandCCRBorCCRA ♦ Step1.ReaddatafromtheHighByteTMxDH,TMxAHorTMxBH –HeredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched fromtheLowByteregisterintothe8-bitbuffer. ♦ Step2.ReaddatafromtheLowByteTMxDL,TMxALorTMxBL –Thisstepreadsdatafromthe8-bitbuffer. AstheCCRAandCCRBregistersareimplementedinthewayshowninthefollowingdiagramand accessingtheseregisterpairsiscarriedoutinaspecificwaydescribedabove,itisrecommendedto usethe"MOV"instructiontoaccesstheCCRAandCCRBlowbyteregisters,namedTMxALand TMxBL,usingthefollowingaccessprocedures.AccessingtheCCRAorCCRBlowbyteregisters withoutfollowingtheseaccessprocedureswillresultinunpredictablevalues. |
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