F_CLOCK changed to F_USB to be more descriptive, and applicable on future architecture ports.
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*
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* - <b>MCU</b>, the target AVR processor
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* - <b>BOARD</b>, the target board hardware
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* - <b>F_CLOCK</b>, the target raw master clock frequency, before any prescaling is performed
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* - <b>F_USB</b>, the target raw master clock frequency, before any prescaling is performed
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* - <b>F_CPU</b>, the target AVR CPU master clock frequency, after any prescaling
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* - <b>CDEFS</b>, the C preprocessor defines which configure options the source code
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* - <b>LUFA_PATH</b>, the path to the LUFA library source code
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*
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* For boards with built in hardware driver support within the LUFA library, see \ref Page_DeviceSupport.
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*
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* \section Sec_F_CLOCK The F_CLOCK Parameter
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* \section Sec_F_USB The F_USB Parameter
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* This parameter indicates the target AVR's input clock frequency, in Hz. This is the actual clock input, before any prescaling is performed. In the
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* USB AVR architecture, the input clock before any prescaling is fed directly to the PLL subsystem, and thus the PLL is derived directly from the
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* clock input. The PLL then feeds the USB and other sections of the AVR with the correct upscaled frequencies required for those sections to function.
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