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HT45F3W Datasheet(PDF) 146 Page - Holtek Semiconductor Inc |
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HT45F3W Datasheet(HTML) 146 Page - Holtek Semiconductor Inc |
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146 / 167 page  Rev. 1.50 14� De�e��e� 01� �01� Rev. 1.50 147 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU VLCDC Register Bit 7 6 5 4 3 2 1 0 Na�e VLCDEN — — — VLCD3 VLCD� VLCD1 VLCD0 R/W R/W — — — R/W R/W R/W R/W POR 0 — — — 0 0 0 0 Bit7 VLCDEN:LCDpowerenableordisablecontrol 0:disable–VSSconnectedtobiasingcircuits–LCDoff 1:enable–VLCDconnectedtoLCDbiasingcircuits WhentheVLCDENbithasbeensetto“1”,theregulatormustbeenabledbythe programsimultaneously,sothattheLCDcanobtainitspowersupply. Bit6~4 Unimplemented,readas“0” Bit3~0 VLCD3~VLCD0:LCDvoltageselect 0000:3.0V 0001:3.1V 0010:3.2V 0011:3.3V 0100:3.4V 0101:3.5V 0110:3.6V 0111:3.7V 1000:3.8V 1001:3.9V 1010:4.0V 1011:4.1V 1100:4.2V 1101:4.3V 1110:4.4V 1111:4.5V Clock Source TheLCDclocksourceistheinternalclocksignal,fSUB,dividedby8,usinganinternaldivider circuit.ThefSUBinternalclockissuppliedbyeithertheLIRCorLXToscillator,thechoiceofwhich isdeterminedbyaconfigurationoption.ForproperLCDoperation,thisarrangementisprovidedto generateanidealLCDclocksourcefrequencyof4kHz. fSUB Clock Source LCD Clock Frequency LIRC 4kHz LXT 4kHz LCD Clock Source LCD Driver Output WhentheSEG7C~SEG0CbitsintheSEGCRregisterareclearedtozero,theSEG7/PD7~SEG0/ PD0lineswillbesetupasLCDdriverpinstodrivetheLCDdisplay,otherwise,theywillhave generalI/Ofunctions.ThebiasinganddutyofLCDaredependentuponhowtherelatedLCD controlbitsareprogrammed.ThenatureofLiquidCrystalDisplaysrequirethatonlyACvoltages canbeappliedtotheirpixelsastheapplicationofDCvoltagestoLCDpixelsmaycausepermanent damage.ForthisreasontherelativecontrastofanLCDdisplayiscontrolledbytheactualRMS voltageappliedtoeachpixel,whichisequaltotheRMSvalueofthevoltageontheCOMpinminus thevoltageappliedtotheSEGpin.ThisdifferentialRMSvoltagemustbegreaterthantheLCD saturationvoltageforthepixeltobeonandlessthanthethresholdvoltageforthepixeltobeoff. |
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