Features
Fully Compliant with USB Specification v2.0 (Full-Speed)
On Chip USB 1.1 transceiver, 5V->3.3V regulator
On-chip 96MHz clock generator
Supports RS-422/RS-485 like serial interface (TXD, DTR_N, and RTS_N pins should be externally pulled-up to 5V)
Supports RS232-like Serial ..