dmitri wrote:Use components values as shown in the schematics unless you know you can use different values. After that test it again and describe the problem if it's still there. 99% chance is you have a short or a break somewhere on the board.
Thanks. I was using an old firmware, So I have to program it via AvrDude. It was a mistake in the Low Fuse Bits. I was using lfuse:w:0xE2:m instead of lfuse:w:0xF7:m. So the Mega644 worked fine. The 18F2550 works fine but serial comunication was runiing at bad speeds.