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HT45R4U датащи(PDF) 34 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 34 Page - Holtek Semiconductor Inc |
34 / 105 page Rev. 1.10 34 �a��� 1�� �01� Rev. 1.10 3� �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD LCD Driver Forlargevolumeapplications,whichincorporateanLCDintheirdesign,theuseofacustom displayratherthanamoreexpensivecharacterbaseddisplayreducescostssignificantly.However, thecorrespondingCOMandSEGsignalsrequired,whichvaryinbothamplitudeandtime,todrive suchacustomdisplayrequiremanyspecialconsiderationsforproperLCDoperationtooccur.The devicecontainsanLCDDriverfunction,whichwiththeirinternalLCDsignalgeneratingcircuitry andvariousoptions,willautomaticallygeneratethesetimeandamplitudevaryingsignalstoprovide ameansofdirectdrivingandeasyinterfacingtoarangeofcustomLCDs. Duty Driver Number Bias Bias Type Wave Type 1/4 3�x4 1/3 C A o� B LCD Selections C t y pe 1 /3 B i as ( Mo de 1 ) PL CD V A V B LC D Po we r Su pp ly V C (= PL CD) (= PL CD ´ 0. 5) VM AX (= PL CD ´ 1. 5) C har ge Pu mp C1 C2 0. 1 m F 0. 1 m F V1 C t y pe 1 /3 B i as ( Mo de 2 ) V1 V A V B LC D Po we r Su pp ly V C (= V1 ´ 1/ 3) VM AX (= V1 ) C har ge Pu mp C1 C2 0. 1 m F 0. 1 m F PL CD 0. 1 m F V2 (= V1 ´ 2/ 3) 0. 1 m F V2 C Type 1/3 Bias Display Memory AnareaofDataMemoryisespeciallyreservedforusefortheLCDdisplaydata.Thisdataarea isknownastheDisplayMemory.Anydatawrittenherewillbeautomaticallyreadbytheinternal displaydrivercircuits,whichwillinturnautomaticallygeneratethenecessaryLCDdrivingsignals. ThereforeanydatawrittenintothisMemorywillbeimmediatelyreflectedintotheactualdisplay connectedtothemicrocontroller. AstheDisplayMemoryaddressesoverlapthoseoftheGeneralPurposeDataMemory,itsstoredin itsownindependentBank1area.TheDataMemoryBanktobeusedischosenbyusingtheBank Pointer,whichisaspecialfunctionregisterintheDataMemory,withthename,BP.Toaccessthe DisplayMemorythereforerequiresfirstthatBank1isselectedbywritingavalueof01HtotheBP register.Afterthis,thememorycanthenbeaccessedbyusingindirectaddressingthroughtheuseof MemoryPointerMP1.WithBank1selected,thenusingMP1toreadorwritetothememoryarea, startingwithaddress40H,willresultinoperationstotheDisplayMemory.Directlyaddressingthe DisplayMemoryisnotapplicableandwillresultinadataaccesstotheBank0GeneralPurpose DataMemory. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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