when you want to control a 5V device with a 3v3 output, it is no problem.
when you want to read an input with a 3v3 device from a 5V device, you can use a resistor divider.
but : best to run both devices at the same voltage, and second best is to use a level translator.
the LCD data port is bidirectional so it can be in input our output mode. what level will these pins have in output mode? i assume the will be 5V and destroy your xmega.
you can fix the WR line to ground. in that case there should be no problem.
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