HT66F20 datasheet(231/298 Pages) HOLTEK

231 / 298 page

Rev. 1.90

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

SCOM Function for LCD

ThedeviceshavethecapabilityofdrivingexternalLCDpanels.ThecommonpinsforLCDdriving,

SCOM0~SCOM3,arepinsharedwithcertainpinonthePC0~PC3orPC0~PC1,PC6~PC7port.

TheLCDsignals(COMandSEG)aregeneratedusingtheapplicationprogram.

LCD Operation

AnexternalLCDpanelcanbedrivenusingthisdevicebyconfiguringthePC0~PC3orPC0~PC1,

PC6~PC7pinsascommonpinsandusingotheroutputportslinesassegmentpins.TheLCDdriver

functioniscontrolledusingtheSCOMCregisterwhichinadditiontocontrollingtheoverallon/off

functionalsocontrolsthebiasvoltagesetupfunction.ThisenablestheLCDCOMdrivertogenerate

thenecessaryVDD/2voltagelevelsforLCD1/2biasoperation.

TheSCOMENbitintheSCOMCregisteristheoverallmastercontrolfortheLCDdriver,however

thisbitisusedinconjunctionwiththeCOMnENbitstoselectwhichPortCpinsareusedforLCD

driving.NotethatthePortControlregisterdoesnotneedtofirstsetupthepinsasoutputstoenable

theLCDdriveroperation.

V DD

SC OM 0~

SC OM 3

SC OM EN

CO Mn EN

V DD /2

SC OM o per at i ng cu rre nt

LCD COM Bias

SCOMEN

COMnEN

Pin Function

O/P Level

I/O

0 o� 1

I/O

0 o� 1

SCOMn

VDD/�

Output Control

HT66F20 Datasheet(PDF) 231 Page - Holtek Semiconductor Inc

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