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Title: Xtal value? (Q1) Post by: spumanti on 22 Nov 2004, 11:36 Hi !
A question about Q1. In the diagram it is a 14,7456 MHz Xtal used to clock the ATMega8. Can I use any Xtal, or does it have to be the 14,7456 MHz one? (I can't get an Xtal with that specific frequency). Can I use any of the following ones: 12,288 MHz, 15,000 MHz, 16,000 MHz ??? (these are Xtals that I have available) Thanks in advance. :) Title: Xtal value? (Q1) Post by: Vitat on 22 Nov 2004, 11:59 Maybe 15MHz will be work, but not perfectly.
Title: Xtal value? (Q1) Post by: spumanti on 22 Nov 2004, 12:17 ok...
Is it a timing problem, or... :?: Can I change something in the software (in the ATMega8) to make it work better, or maybe use the internal clock in the ATMega8? Title: Xtal value? (Q1) Post by: Vitat on 22 Nov 2004, 15:32 1. You must change Xtal in Constant.h for normal use Uart speed.
2. If emulator will be not work fine with Head Unit, you must adapt timings in link.c. Title: Xtal value? (Q1) Post by: spumanti on 22 Nov 2004, 15:37 ok... sounds a bit complicated, since i dont know anything about the timings of the signals and so on... but i'll have to try, since i can't get the right Xtal
Thanks for the info :) |