I recently built an Arduino clone with an Atmega328 and it seems to be working nicely. Now I am thinking about a 3.3V version. From what I can see, I have to run it at 8MHz. My question is should I use the internal 8MHz oscillator or use an external?
I am looking at an ABL-8.000MHZ-B2 datasheet. I have some 22pF caps I was using on the 5V. Can I use those on this too? The data sheet says, "Load Capacitance 18pF", so I guess I should use 18 instead? Or is 22 close enough?
Alternately, I was thinking about an external resonator. Is that any better than the internal? I am looking at AWCR-8.00MD datasheet. However, for 8MHz, this datasheet lists Vdd at 12V! So is that 12V max, or 12V period no discussion?