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Text excerpt from page 21 (click to view)
5.2.4 Backlight Control
Backlight is controlled by KBC. Measure the amount of light with the light sensor. When light amount falls below a certain amount backlight turns on. When light amount exceeds a certain amount backlight turns off. By having a certain amount of hysteresis it prevents the flickering of the backlight. Backlight control is shown in Figure 5.2.4.