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HT45R4U датащи(PDF) 38 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 38 Page - Holtek Semiconductor Inc |
38 / 105 page Rev. 1.10 38 �a��� 1�� �01� Rev. 1.10 39 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Programming Considerations CertainprecautionsmustbetakenwhenprogrammingtheLCD.Oneoftheseistoensurethatthe DisplayMemoryisproperlyinitialisedafterthemicrocontrollerispoweredon.LiketheGeneral PurposeDataMemory,thecontentsoftheDisplayMemoryareinanunknownconditionafter power-on.AsthecontentsoftheDisplayMemoryywillbemappedintotheactualdisplay,itis importanttoinitialisethismemoryareaintoaknownconditionsoonafterapplyingpowertoobtain aproperdisplaypattern. ConsiderationmustalsobegiventothecapacitiveloadoftheactualLCDusedintheapplication. AstheloadpresentedtothemicrocontrollerbyLCDpixelscanbegenerallymodeledasmainly capacitiveinnature,itisimportantthatthisisnotexcessive,apointthatisparticularlytrueinthe caseoftheCOMlineswhichmaybeconnectedtomanyLCDpixels.Theaccompanyingdiagram depictstheequivalentcircuitoftheLCD. CO M0 CO M1 CO M2 CO Mn SE G0 SEG 1 SEG 2 SEG n LCD Panel Equivalent Circuit One additional consideration that must be taken into account is what happens when the microcontrollerentersaPowerDowncondition.TheLCDENcontrolbitintheLCDCTRL registerpermitsthedisplaytobepoweredofftoreducepowerconsumption.Ifthisbitiszero,the drivingsignalstothedisplaywillcease,producingablankdisplaypatternbutreducinganypower consumptionassociatedwiththeLCD. AfterPower-on,notethatastheLCDENbitwillbeclearedtozero,thedisplayfunctionwillbe disabled. The accompanying timing diagrams depict the display driver signals generated by the microcontrollerforvariousvaluesofdutyandbias.Thehugerangeofvariouspermutationsonly permitsafewtypestobedisplayedhere. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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