Short summary edition of the ATmega8 AVR microcontroller datasheet, only 200 KB in PDF form. Such summaries typically give the feature list, pin configuration drawings, pin descriptions, ordering codes and package dimensions. It is useful at the bench to quickly identify which pin carries power, reset, the crystal or ISP signals on a populated board. For register-level detail, fuse descriptions and full electrical tables you will need the complete ATmega8 datasheet, since those chapters are cut from this version.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.