Microchip’s 18F2520 8-Bit Processor. 32K of program space and 25 I/O lines, 10 of which are 10bit Analog to Digital converter capable. Runs up to 40MHz in conjunction with the internal PLL and an external 10MHz crystal, or can also be run up to 20MHz with an external 20MHz external crystal. Internal 8MHz oscillator also available. Check datasheet for more information on oscillator settings. Package can be programmed in circuit.
Documents: 18F2520 Datasheet