Suggestion to solve system clock issue#2

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simonklee wants to merge 2 commits intoesmil:masterfrom

simonklee:serial

Commits on Oct 24, 2010

add possibility to use different clock speed with UART for ATmegaX8
Simon Zimmermann
committed

Commits on Oct 25, 2010

use correct divisor since double speed operation is set
Simon Zimmermann
committed