The LCD driver generates the segment and common signals to drive segment liquid crystal display (LCD) glass. The LCD controller has dedicated data memories to hold segment drive information. Common and segment signals are generated as defined by the mode. Static, 2-mux, 3-mux, up to 8-mux LCDs are supported. The module can provide an LCD voltage independent from the main supply voltage with its integrated charge pump. The LCD display contrast can be trimmed by setting the LCD drive voltage. The LCD module can be fully functional in any power mode from AM to LPM3.5.
When supplied by the on-chip charge pump with on-chip regulator reference, the LCD driver needs five pins and four external 0.1-µF capacitors to achieve low-power consumption during operation. Figure 9-2 shows the recommended connections.
The LCD contains 20 16-bit words (40 bytes) display memory. The use of memory is flexible, depending on the selected mode: