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HT48R068B Arkusz danych(PDF) 71 Page - Holtek Semiconductor Inc

Numer części HT48R068B
Szczegółowy opis  Enhanced I/O 8-Bit OTP MCU
Download  118 Pages
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
LCD SCOM Function
ThedeviceshavethecapabilityofdrivingexternalLCDpanels.ThecommonpinsforLCDdriving,
SCOM0~SCOM3,arepinsharedwiththePB0~PB3pins.TheLCDsignals,COMandSEG,are
generatedusingtheapplicationprogram.
LCD Operation
AnexternalLCDpanelcanbedrivenusingthisdevicebyconfiguringthePB0~PB3pinsascommon
pinsandusingotheroutputportslinesassegmentpins.TheLCDdriverfunctioniscontrolled
usingtheSCOMCregisterwhichinadditiontocontrollingtheoverallon/offfunctionalsocontrols
thebiasvoltagesetupfunction.ThisenablestheLCDCOMdrivertogeneratethenecessaryVDD/2
voltagelevelsforLCD1/2biasoperation.TheSCOMENbitintheSCOMCregisteristheoverall
mastercontrolfortheLCDDriver,howeverthisbitisusedinconjunctionwiththeCOMnENbitsto
selectwhichPortBpinsareusedforLCDdriving.NotethatthePortControlregisterdoesnotneed
tofirstsetupthepinsasoutputstoenabletheLCDdriveroperation.
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
SCOM Circuit
SCOMEN
COMnEN
Pin Function
O/P Level
0
X
I/O
0 o� 1
1
0
I/O
0 o� 1
1
1
SCOMn
VDD/�
Output Control


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