Datasheet document covering the PIC18F6580 and the related PIC18F6680 microcontrollers from Microchip, in PDF format. At only 38.2 KB the file is very small, so it is likely a short product brief or summary rather than the full reference manual, and may not include complete register or electrical tables. It is still handy for a quick look at features, memory sizes and package options. For pin-level tracing or programming details, verify against the full Microchip datasheet before relying on it during a repair.
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.