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HT82R732 データシート(PDF) 54 Page - Holtek Semiconductor Inc |
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HT82R732 データシート(HTML) 54 Page - Holtek Semiconductor Inc |
54 / 74 page 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 |
同様の部品番号 - HT82R732 |
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同様の説明 - HT82R732 |
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