Datasheet for the classic Microchip PIC16C84, an early 18-pin microcontroller with electrically erasable program memory, delivered as a 961 KB PDF. It describes pin functions, memory and data EEPROM organisation, timer and interrupt features, the instruction set and electrical characteristics. This device was widely used in older hobby projects and access control products. The document helps identify pins during troubleshooting, confirm programming connections and check whether a newer compatible chip can serve as a replacement.
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.