Clock source options of the ATmega328 variants include full swing crystal oscillator, which can be selected by configuring the flash fuse. However, in the new ATmega328PB, the full swing crystal oscillator is removed. Refer to the "Clock Sources" chapter of the respective datasheet.
| Device function | ATmega328PB | ATmega328 variants |
|---|---|---|
| Full swing crystal oscillator | No | Yes |