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PMIC: CP240x LCD Driver Family Slide 10
Silicon Labs’ devices (MCU and fixed function) integrate an LCD controller that generates the waveforms required by the display. The controller has its own ultra-low power memory that is used to map the segments of the display. Each bit in the memory array represents a segment and backplane/common combination. The picture shown above to the left shows the ULP memory array. Static mode uses a single common and is denoted as COM0 so only the bits that are referenced with COM0 get used. As shown in the figure, these are bits 0 and 4 at each memory location. To turn on the segment connected to pin 21, bit 4 at address ULPMEM10 would set. In the example above the actual display segment mapping is shown on the right. If pin 21 of the controller is connected to pin 21 of the display then segment 8A would be turned on.
PTM Published on: 2011-05-13