h5b/arduino_uno_328p — pull request #2 by basti1508 (2014-01-24 09:38:40+00:00)
Title: Changing ubrr variable to 16 bit

Currently it's been 8 bit and problem was detected.
A Problem will occure only if the ubrr exceeds 256 what happens
starting with a combination of F_CPU=5000000UL and a baudrate
of 2400. (Datasheet p. 210)