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HT45F4N Datasheet(PDF) 74 Page - Holtek Semiconductor Inc |
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HT45F4N Datasheet(HTML) 74 Page - Holtek Semiconductor Inc |
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74 / 170 page  Rev. 1.30 7� De�e��e� 1�� �01� Rev. 1.30 75 De�e��e� 1�� �01� HT45F4N/HT45FH4N Power Bank Flash MCU HT45F4N/HT45FH4N Power Bank Flash MCU Programming Considerations TheTMCounterRegisters,theCapture/CompareCCRAandtheCCRPregisters,beingeither16- bitor10-bit,allhavealowandhighbytestructure.Thehighbytescanbedirectlyaccessed,butas thelowbytescanonlybeaccessedviaaninternal8-bitbuffer,readingorwritingtotheseregister pairsmustbecarriedoutinaspecificway.Theimportantpointtonoteisthatdatatransfertoand fromthe8-bitbufferanditsrelatedlowbyteonlytakesplacewhenawriteorreadoperationtoits correspondinghighbyteisexecuted.AstheCCRAandCCRPregistersareimplementedintheway showninthefollowingdiagramandaccessingtheseregisterpairsiscarriedoutinaspecificway describedabove,itisrecommendedtousethe“MOV”instructiontoaccesstheCCRAorCCRP lowbyteregisters,namedTMxALorTMxRPL,usingthefollowingaccessprocedures.Accessing theCCRAorCCRPlowbyteregisterwithoutfollowingtheseaccessprocedureswillresultin unpredictablevalues. Data Bus 8-�it Buffe� TMxDH TMxDL TMxRPH TMxRPL TMxAH TMxAL TM Counte� Registe� (Read only) TM CCRA Registe� (Read/W�ite) TM CCRP Registe� (Read/W�ite) Thefollowingstepsshowthereadandwriteprocedures: • WritingDatatoCCRAorCCRP ♦ Step1.WritedatatoLowByteTMxALorTMxRPL – notethatheredataisonlywrittentothe8-bitbuffer. ♦ Step2.WritedatatoHighByteTMxAHorTMxRPH – heredataiswrittendirectlytothehighbyteregistersandsimultaneouslydataislatched fromthe8-bitbuffertotheLowByteregisters. • ReadingDatafromtheCounterRegistersandCCRAorCCRP ♦ Step1.ReaddatafromtheHighByteTMxDH,TMxAHorTMxRPH – heredataisreaddirectlyfromtheHighByteregistersandsimultaneouslydataislatched fromtheLowByteregisterintothe8-bitbuffer. ♦ Step2.ReaddatafromtheLowByteTMxDL,TMxALorTMxRPL – thisstepreadsdatafromthe8-bitbuffer. |
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