Short 279 KB PDF datasheet for the Microchip PIC16C5xx family of baseline microcontrollers. Given its small size it may be a condensed document or product summary rather than a complete reference, so tables of registers or electrical limits could be limited. It still serves to identify package pinouts, memory sizes and basic features of the variants covered. When accuracy matters for programming or replacement, compare the information with the full Microchip datasheet and the exact part number marked on the chip.
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.