Figure 1-2 ATmega328PB Xplained Mini Webpage
In the
Documents
tab, all the kit related documents like schematics and user guide can be found.
Atmel AT08401: Getting Started with Atmel ATmega328PB [APPLICATION NOTE]
Atmel-42482A-Getting-Started-with-ATmega328PB_AT08401_Application Note-08/2015
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