PDF datasheet, 2.54 MB, for the Microchip PIC16F72 flash microcontroller with an 8-bit ADC and capture, compare and PWM module. It details pin assignments, oscillator settings, configuration bits, peripherals and electrical ratings. In service work the document helps identify the power, reset and ICSP pins, trace I/O lines driving relays, displays or motor stages, and confirm voltage ranges. Before reprogramming, read the device with a PIC programmer and keep the backup, noting that a protected chip will return blank or scrambled data.
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.