Internal RC oscillator is specified up to 8MHz, but in reality it can be calibrated to run at up to 12MHz. V-USB has code that does this. HaD, please, work on your terminology.

It is one of our favorite chips, and the brains behind the Arduino UNO and its clones, and it’s getting a tweak (PDF). The ATmega328 and other megaX8-series chips have undergone a subtle desi… ...