3.1 Charge Pump Only Mode (LCDVSRC<3:0> = 0110)

By setting the LCDVSRC<3:0> bits of the LCDVCON2 register to ‘0110’, the voltage will be supplied to the LCD panel from the charge pump only. When configured to operate in this mode, the internal LCD charge pump will generate all necessary LCD bias voltages (VLCDx) directly, boosting the V_DD voltage, if necessary. This mode cannot be used with 1/2 Bias LCD glass and is only valid for Static (two discrete levels), and 1/3 Bias (four discrete levels). The internal reference ladder is bypassed in this mode, and any changes to the LCD Contrast Control bits (LCDCST) will not alter the contrast of the display. While operating within this LCDVSRC configuration, contrast can be controlled by altering the output of the LCD charge pump by programming the BIAS<2:0> bits. An advantage to operating the LCD panel in this power mode is that it provides the most power efficient voltage biasing.