5V displays will not have enough contrast at lower voltage to show anything. ![]() The HD44780 controller will happily run from 3,3V, but the display matrix itself requires higher voltage to move crystals around. Displays usually require 5V, while XMEGA is 3,3V-only. One of the obstacles to using HD44780 with XMEGA are different supply voltages. The world of character LCDs has mainly standarized on HD44780 controller chip, which was designed to be interfaced with the rest of the system by a parallel bus, but today simple bit-banging does the job. ![]() Character LCD are one of the easiest and cheapest way of adding output to a microcontroller system.
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