5, RES Reset pin LCM - This pin is a reset signal input. When the pin is low, the chip reset is performed. Keep this pin high during normal operation.
6, DC Data/Command control
7, CS Chip Select
8, BLK Backlight, pull high to turn on. Use logic-level or PWM. This is not analog input. It connects to the base of an NPN transistor for turning on or off the backlight LEDs.