Datasheet covering the Atmel ATxmega D3 series, 64-pin parts in the cost-reduced AVR XMEGA D family. This 3.40 MB PDF details pinout, port alternate functions, memory sizes, packages, electrical limits and errata, while register descriptions are found in the XMEGA D manual. It is helpful when tracing signals around the controller, finding the PDI programming interface or confirming supply rails. D-series chips lack some A-series peripherals such as DMA and external bus, so check compatibility before substituting.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.