AVR-Chat

Hi,

I'm using WinAVR, AVR Studio 4, STK502 development board populated with 
an atmega169.  I'm currently trying to understand how to use the UART 
and am reading the ATMEGA169 datasheet (doc2514).  To help me 
understand how to use the UART, I'm trying my best not to look at any 
code to see if I can figure it out by understanding all the gory 
details.

The atmega169 datasheet refers to a variable called fosc in the USART 
secstion and I'm having a tough time figuring out what fosc is for the 
stk502.  Can anyone provide guidance as to what this value is and how 
to figure it out?

Again, referring to the stk502, what are the clock frequencies for clk
(CPU), clk(FLASH), clk(I/O), and clk(ASY)?  And, how are these 
frequencies derived?

Thanks,
bronzefury