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HT67F370 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc |
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HT67F370 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 225 page  Rev. 1.00 38 �an�a�� 0�� �01� Rev. 1.00 39 �an�a�� 0�� �01� HT67F370 TinyPowerTM A/D Flash MCU with LCD & EEPROM HT67F370 TinyPowerTM A/D Flash MCU with LCD & EEPROM Data Memory Addressing Forthedevicethatsupportstheextendedinstructions,thereisnoBankPointerforDataMemory. TheBankPointer,PBP,isonlyavailableforProgramMemory.ForDataMemorythedesiredSector ispointedbytheMP1HorMP2HregisterandthecertainDataMemoryaddressintheselected sectorisspecifiedbytheMP1LorMP2Lregisterwhenusingindirectaddressingaccess. DirectAddressingcanbeusedinallsectorsusingthecorrespondinginstructionwhichcanaddress allavailabledatamemoryspace.Fortheaccesseddatamemorywhichislocatedinanydatamemory sectorsexceptsector0,theextendedinstructionscanbeusedtoaccessthedatamemoryinstead ofusingtheindirectaddressingaccess.Themaindifferencebetweenstandardinstructionsand extendedinstructionsisthatthedatamemoryaddress"m"intheextendedinstructionshas13valid bitsforthisdevice,thehighbyteindicatesasectorandthelowbyteindicatesaspecificaddress. General Purpose Data Memory Allmicrocontrollerprogramsrequireanareaofread/writememorywheretemporarydatacanbe storedandretrievedforuselater.ItisthisareaofRAMmemorythatisknownasGeneralPurpose DataMemory.ThisareaofDataMemoryisfullyaccessiblebytheuserprogramingforbothreading andwritingoperations.Byusingthebitoperationinstructionsindividualbitscanbesetorreset underprogramcontrolgivingtheuseralargerangeofflexibilityforbitmanipulationintheData Memory. Special Purpose Data Memory This area of Data Memory is where registers, necessary for the correct operation of the microcontroller,arestored.Mostoftheregistersarebothreadableandwriteablebutsomeare protectedandarereadableonly,thedetailsofwhicharelocatedundertherelevantSpecialFunction Registersection.Notethatforlocationsthatareunused,anyreadinstructiontotheseaddresseswill returnthevalue"00H". LCD Display Data Memory ThedatatobedisplayedontheLCDdisplayisstoredinanareaoffullyaccessibleDataMemory. BywritingtothisareaofRAM,thedisplayoutputcanbedirectlycontrolledbytheapplication program.AstheLCDMemoryaddressesoverlapthoseoftheGeneralPurposeDataMemory,itis storedinitsownindependentSector1areaforLCDdisplay.Thisareaislocatedinthe80H~B0Hat Sector1.ToaccesstheDisplayMemorythereforerequiresfirstthatSector1isselectedbywriting avalueof01HtoMP1HorMP2H.Afterthis,thememorycanthenbeaccessedbyusingindirect addressingthroughtheuseofMP1LorMP2L.WithSector1selected,thenusingMP1LorMP2Lto readorwritetothememoryarea,from80HtoB0H,willresultinoperationstotheLCDmemory. DirectlyaddressingtheDisplayMemoryisnotapplicableandwillresultinadataaccesstothe Sector0GeneralPurposeDataMemory. |
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