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HT82R732 データシート(PDF) 54 Page - Holtek Semiconductor Inc

部品番号 HT82R732
部品情報  e-Banking 8-Bit OTP MCU
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT82R732 データシート(HTML) 54 Page - Holtek Semiconductor Inc

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Programming Considerations
Certain precautions must be taken when programming the LCD. One of these is to ensure that the LCD
Memory is properly initialised after the microcontroller is powered on. Like the General Purpose Data
Memory, the contents of the LCD Memory are in an unknown condition after power-on. As the
contents of the LCD Memory will be mapped into the actual display, it is important to initialise this
memory area into a known condition soon after applying power to obtain a proper display pattern.
Consideration must also be given to the capacitive load of the actual LCD used in the application. As
the load presented to the microcontroller by LCD pixels can be generally modeled as mainly
capacitive in nature, it is important that this is not excessive, a point that is particularly true in the case
of the COM lines which may be connected to many LCD pixels. The accompanying diagram depicts
the equivalent circuit of the LCD.
One additional consideration that must be taken into account is what happens when the
microcontroller enters the HALT Mode. The LCDEN control bit in the LCDC register permits the
display to be powered off to reduce power consumption. If this bit is zero, the driving signals to the
display will cease, producing a blank display pattern but reducing any power consumption associated
with the LCD.
After Power-on, note that as the LCDEN bit will be cleared to zero, the display function will be
disabled.
Rev. 1.00
54
October 31, 2013
HT82R732
e-Banking 8-Bit OTP MCU
C O M 0
C O M 1
C O M 2
C O M n
S E G 0
S E G 1
S E G 2
S E G n
LCD Panel Equivalent Circuit


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