Summary edition of the ATmega8515 AVR microcontroller datasheet, a 182 KB PDF. It usually lists core features, pin configurations for each package, pin descriptions and ordering codes. On the bench it helps identify power, reset, crystal and ISP pins quickly, or confirm that a replacement chip has the same package and pinout. Register details, fuse settings and full electrical characteristics are not part of the short version, so use the complete ATmega8515 datasheet when preparing to program the device.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.