3.1 Full Swing Oscillator

Clock source options of the ATmega324 variants include full swing crystal oscillator, which can be selected by configuring the flash fuse. However, in the new ATmega324PB, the full swing crystal oscillator is removed. Refer to the Clock Sources in the respective datasheet.

Table 3-1. Full Swing Oscillator Removed from ATmega324PB
Device function	ATmega324PB	ATmega324PA	ATmega324P	ATmega324A
Full swing crystal oscillator	No	Yes	Yes	Yes

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