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HT69F360 数据表(PDF) 197 Page - Holtek Semiconductor Inc |
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HT69F360 数据表(HTML) 197 Page - Holtek Semiconductor Inc |
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197 / 235 page  Rev. 1.30 19� �ove��e� 1�� �01� Rev. 1.30 197 �ove��e� 1�� �01� HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM LCDC1 Register Bit 7 6 5 4 3 2 1 0 �a�e — — — — — RCT LCDP1 LCDP0 R/W — — — — — R/W R/W R/W POR — — — — — 0 0 0 Bit7~3 Unimplemented,readas"0" Bit2 RCT:LCDR/CTypeControl 0:RType 1:CType Bit1~0 LCDP1~LCDP0:LCDpowersourceselectforCtype 00:thepowersourceisfromVLCD/V1/V2 01:thepowersourceisfromVC=DPNVref(~1.08V) 10:thepowersourceisfromVB=VDD 11:thepowersourceisfromVA=VDD IfLCDEN=1andRCT=1,thePC0~2willbeV2,C1,C2functionrespectively. LCD Reset Function TheLCDhasaninternalresetfunctionthatisanORfunctionoftheinvertedLCDENbitinthe LCDC0registerandtheSLEEPfunction.WhentheLCDENbitissetto1toenabletheLCDdriver functionbeforethedeviceenterstheSLEEPmode,theLCDfunctionwillberesetafterthedevice enterstheSLEEPmode.ClearingtheLCDENbittozerowillalsoresettheLCDfunction. LCDEN SLEEP Mode Reset LCD 0 Off √ 0 On √ 1 Off x 1 On √ LCD Reset Function LCD Driver Output ThenumberofCOMandSEGoutputssuppliedbytheLCDdriver,aswellasthewavetype,R/C type,biasingandthedutyselections,aredependentuponhowtheLCDcontrolbitsareprogrammed. ThenatureofLiquidCrystalDisplaysrequirethatonlyACvoltagescanbeappliedtotheirpixels astheapplicationofDCvoltagestoLCDpixelsmaycausepermanentdamage.Forthisreasonthe relativecontrastofanLCDdisplayiscontrolledbytheactualRMSvoltageappliedtoeachpixel, whichisequaltotheRMSvalueofthevoltageontheCOMpinminusthevoltageappliedtothe SEGpin.ThisdifferentialRMSvoltagemustbegreaterthantheLCDsaturationvoltageforthe pixeltobeonandlessthanthethresholdvoltageforthepixeltobeoff. TherequirementtolimittheDCvoltagetozeroandtocontrolasmanypixelsaspossiblewith aminimumnumberofconnectionsrequiresthatbothatimeandamplitudesignalisgenerated andappliedtotheapplicationLCD.Thesetimeandamplitudevaryingsignalsareautomatically generatedbytheLCDdrivercircuitsinthemicrocontroller.Whatisknownasthedutydetermines thenumberofcommonlinesused,whicharealsoknownasbackplanesorCOMs.Theduty,which ischosenbyacontrolbittohaveavalueof1/3or1/4andwhichequatestoaCOMnumberof3 or4respectively,thereforedefinesthenumberoftimedivisionswithineachLCDsignalframe. Twotypesofsignalgenerationarealsoprovided,knownasTypeAandTypeB,therequiredtypeis selectedviatheTYPEbitintheLCDC0register.TypeBofferslowerfrequencysignals,however lowerfrequenciesmayintroduceflickeringandinfluencedisplayclarity. |
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