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The timing of the segment driver outputs affect the overall appearance and the life of the display in addition to affecting the system power consumption. A refresh rate too slow might make the display appear to flicker, whereas a rate too fast might cause it to not appear correctly. The display can be viewed as a capacitive load and its power consumption is affected by the refresh rate. A faster clock increases power consumption for an MCU for example and similarly running the refresh rate of the display too fast causes an unnecessary increase in supply current. All of the timing components required to drive the display are integrated into the IC. The LCD controller can be clocked from the smaRTClock oscillator or from an external source. Once the smaRTClock oscillator is set up, the refresh rate is determined by the equation shown above. Note that the rate is always divided by 2 times the number of muxes. As discussed in the section on waveform outputs, there are always two cycles with the number of steps equal to the mux value to provide the 0V DC biased AC signal. The LCDDIV value is determined via configuration of two registers: LCD0DIVL and LCD0DIVH.
PTM Published on: 2011-05-13
South Korea