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HT45R2K-C Datenblatt(PDF) 77 Page - Holtek Semiconductor Inc

Teilenummer HT45R2K-C
Bauteilbeschribung  Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R2K-C Datenblatt(HTML) 77 Page - Holtek Semiconductor Inc

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HT45R2K-C/-B/-A
Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
HT45R2K-C/-B/-A
Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
LCD Driver
Forlargevolumeapplications,whichincorporateanLCDintheirdesign,theuseofacustom
displayratherthanamoreexpensivecharacterbaseddisplayreducescostssignificantly.However,
thecorrespondingsignalsrequired,whichvaryinbothamplitudeandtime,todrivesuchacustom
displayrequiremanyspecialconsiderationsforproperLCDoperationtooccur.TheHoltek
LCDDriverfunction,withitsinternalLCDsignalgeneratingcircuitryandvariousoptions,will
automaticallygeneratethesetimeandamplitudevaryingsignalstoprovideameansofdirectdriving
andeasyinterfacingtoarangeofcustomLCDs.
LCD Memory
AnareaofDataMemoryisespeciallyreservedforusebytheLCDdata.Thisdataarea
isknownastheLCDMemory.Anydatawrittenherewillbeautomaticallyreadbythe
internalLCDdrivercircuits,whichwillinturnautomaticallygeneratethenecessaryLCD
drivingsignals.ThereforeanydatawrittenintotheLCDMemorywillbeimmediately
reflectedintotheactualLCDdisplayconnectedtothemicrocontroller.Thestartaddressof
theLCDMemoryis40H;theendaddressoftheLCDMemoryis5BH.
AstheLCDDataMemoryaddressesoverlapthoseoftheGeneralPurposeDataMemory,
theLCDDataMemoryisstoredinitsownmemorydatabank,whichisdifferentfrom
thatoftheGeneralPurposeDataMemory.TheLCDDataMemoryisstoredinBank1.
TheDataMemoryBankischosenbyusingtheBankPointer,whichisaspecialfunction
registerintheDataMemory,withthename,BP.WhenthelowestbitoftheBankPointer
hasthebinaryvalue“0”,onlytheGeneralPurposeDataMemorywillbeaccessed,no
readorwriteactionstotheLCDMemorywilltakeplace.ToaccesstheLCDMemory
thereforerequiresfirstthatBank1isselectedbysettingthelowestbitoftheBankPointer
tothebinaryvalue“1”.Afterthis,theLCDMemorycanthenbeaccessedbyusing
indirectaddressingthroughtheuseofMemoryPointerMP1.WithBank1selected,then
usingMP1toreadorwritetothememoryarea40H~5BH,willresultinoperationstothe
LCDMemory.DirectlyaddressingtheLCDMemoryisnotapplicableandwillresultina
dataaccesstotheBank0GeneralPurposeDataMemory.
40H
41H
5A H
5B H
SE G0
SE G1
SE G2 6
SE G2 7
LCD Memory Map


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