Cypress Semiconductor CY7C63803-SXC, USB Controller, 1.5Mbps, USB 2.0, 4 to 5.5 V, 16-Pin SOIC

Crystalless oscillator with support for an external clock, eliminates the need for an external crystal or resonator.
Configurable I/O for real world interface without external components
Conforms to USB Specification, Version 2.0
Conforms to USB HID Specification, Version 1.1
Supports one low speed USB device address
Supports one control endpoint and two data endpoints
Harvard architecture
Interface can auto configure to operate as PS/2 or USB
No General Purpose I/O (GPIO) pins required to manage dual mode capability
Each GPIO port supports high impedance inputs, configurable pull-up, open drain output, CMOS/TTL inputs, and CMOS output
Maskable interrupts on all I/O pins
Master or slave operation
Supports half duplex single data line mode for optical sensors
Capture timer registers store both rising and falling edge times.
Separate registers for rising and falling edge capture
Simplifies the interface to RF inputs for wireless applications
Periodic wakeup with no external components
Watchdog timer (WDT)