4700 Backlight Control

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A PWM signal on this line is used to control the brightness of the LCD backlight. In the ts4700.subr file we implement several commands for controlling this backlight. 

 backlight_on()
 backlight_off()
 backlight_low()
 backlight_medium()
 backlight_high()

See #DIO for more information on MFP_85 and the CPU GPIO.

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