XR21V1412 PDF Datasheet
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Description
This is 2-Ch Full-Speed USB UART. XR21V1412
2-CH FULL-SPEED USB UART
JUNE 2009
REV. 1.0.0
GENERAL DESCRIPTION
The XR21V1412 (V1412) 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. The V1412 operates from an internal 48MH- clock therefore no external crystal, oscillator is required like previous generation UARTs. With the fractional baud rate generator, any baud rate can accurately be generated using the internal 48MH- clock. The large 128-byte FIFO and 384-byte RX FIFO of the V1412 helps to optimize the overall data throughput for various applications. The Automatic Transceiver Direction control feature simplifies both the hardware and software for half-duplex RS-485 applications. If required, the multidrop (9-bit) mode with automatic half-duplex tr.