Change the Xtal freq value

Hi all!. What i want to do is use other Xtal value, in fact i'm to feed the OSC IN using other Xtal OSC at my proyect.

Now what i need to know, where i must change the OSC value, and what others dividers/prescalers i must recalculate and fix at the base code.

Best Regards Frank

As a bare minimum, you need to look at wiring.c and ATmegaBOOT_168.c and the bootloader Makefile, I think.

I found this at make file, i'm testing now this variables are: -DF_CPU=16000000 -DBAUD_RATE=19200

The compiler calculate all the dividers by it self or u must calculate and chage by myself?

My CPU is a ATMEGA 8

Best Regards Frank