On Chip USB 1.1 Transceiver, 5V, 3.3V Regulator, and 12 MHz Crystal Oscillator. Connect Directly to 5V, 3.3V, or 2.5V Devices
Supports RS-232 Like Serial Interface: Full-duplex transmitter and receiver (TXD and RXD). Six MODEM control pins (RTS, CTS, DTR, DSR, DCD, and RI). Parity error, frame error, and serial break detection. Programmable baud rate from 75 bps to 6,000,000 bps
Extensive Flow Control Mechanism: Adjustable high/low watermark level. Automatic flow control with CTS/RTS/ XON/XOFF. Configurable 256-byte Outbound Buffer and 256-byte Inbound Buffer or 128-byte Outbound Buffer and 384-byte Inbound Buffer