Microchip's 18F2553 28 Pin USB v2.0 compliant processor. The 18F2553 has 32K of flash, 12 MIPs from a 4MHz external crystal (internal PLL up to 96MHz), and a hardware Full Speed USB 2.0 peripheral. That's right, this little guy can communicate directly with USB. Package can be programmed in circuit.

• Datasheet