The XR21V1412 is an enhanced 2-channel Universal Asynchronous Receiver and Transmitter (UART) with
a USB interface. The USB interface is fully compliant to Full Speed USB 2.0 specification that supports 12
Mbps USB data transfer rate. The USB interface also supports USB suspend, resume and remote wakeup
operations.

USB 2.0 Compliant, Full-Speed (12 Mbps)
■ Supports USB suspend, resume and remote
wakeup operations
■ ± 5 kV HBM ESD protection on USB data pins
■ ± 2 kV HBM ESD protection on all other pins
 Enhanced Features of each UART
■ UART data rates up to 12 Mbps
■ Fractional Baud Rate Generator
■ 128 byte TX FIFO
■ 384 byte RX FIFO
■ 7, 8 or 9 data bits
■ 1 or 2 stop bits
■ Odd, even, mark, space or no parity
■ Automatic Hardware (RTS/CTS or DTR/DSR)
Flow Control
■ Automatic Software (Xon/Xoff) Flow Control
■ Multidrop mode
■ Auto RS-485 Half-Duplex Control
■ Half-Duplex mode
■ Selectable GPIO or Modem I/O