\r
# USB controller master clock frequency.\r
# This will define a symbol, F_USB, in all source code files equal to the\r
-# input clock frequency (before any prescaling is performed) in Hz. This value may\r
-# differ from F_CPU, as the USB clock is often sourced from the same oscillator as\r
-# the CPU clock, but run through multipliers and dividers to achieve the desired\r
-# clock rate.\r
+# input clock frequency of the USB controller's clock generator in Hz.\r
#\r
-# For the UC3 chips, this should be equal to 48MHz or 96MHz.\r
+# For the XMEGA chips, this should be equal to a multiple of 6MHz for Low\r
+# Speed USB mode, or a multiple of 48MHz for Full Speed USB mode.\r
F_USB = ### INSERT CLOCK TO USB MODULE HERE, IN HZ ###\r
\r
\r