I bought a Gertboard a while ago, and one of the features it has on-board is an ATMega328 (DIP). However, since the Gertboard is designed for use with the Raspberry Pi, it only operates at 3.3v, so the clock speed is limited to ~12MHz.
Programming it via the Raspberry Pi is quite cumbersome though. Instead, I'd like to transfer the chip to an Arduino Uno board so I can upload sketches from my desktop PC. I would then transfer it back to the Gertboard for normal operation.
The problem is that my Uno operates at the more typical 5v / 16MHz.
Is it safe to attempt this? Do I need to make any configuration changes in the IDE to tell it to account for a different clock speed?