[solved] Changing CPU speed & boards.txt

Development Other Hardware Development
13

I can think of two possible problems...

  1. Fuse settings are not correct. Try a one-second blink Sketch. You will have to use the USBTinyISP to upload. Does it appear to blink about once a second?

  2. Atmel guarantees that the internal oscillator will be ±10% when a processor leaves the factory. This can be tuned to ±1%. Around 4.5% from the target frequency, high-speed serial communication starts to be troublesome. It is possible the internal oscillator is too far from the target value. Try a Serial Sketch with a very low baud rate (300).