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HT56RB688 데이터시트(PDF) 46 Page - Holtek Semiconductor Inc |
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HT56RB688 데이터시트(HTML) 46 Page - Holtek Semiconductor Inc |
46 / 164 page Programming Considerations Certain precautions must be taken when programming the LCD/LED. One of these is to ensure that the Display Memory is properly initialised after the microcontroller is powered on. Like the General Purpose Data Memory, the contents of the Display Memory are in an unknown condition after power-on. As the contents of the Display 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 a Power Down condition. The LCDEN control bit in the LCDCTRL or LEDEN bit in the LEDCTRL 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 and LEDEN bits will be cleared to zero, the display function will be disabled. The accompanying timing diagrams depict the display driver signals generated by the microcontroller for various values of duty and bias. The huge range of various permutations only permit a few types to be displayed here. Rev. 1.10 46 April 15, 2013 HT56RB688 TinyPowerTM A/D type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces 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 |
유사한 부품 번호 - HT56RB688_13 |
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