XR16M581 Datasheet, PDF (5/51 Pages) Exar Corporation – 1.62V TO 3.63V UART WITH 16-BYTE FIFO AND VLIO INTERFACE

XR16M581
REV. 1.0.1
1.62V TO 3.63V UART WITH 16-BYTE FIFO AND VLIO INTERFACE
1.0 PRODUCT DESCRIPTION
The XR16M581 (M581) is a high performance single-channel UART with a VLIO bus interface. It has its set of
device configuration registers. The configuration registers set is 16550 UART compatible for control, status
and data transfer. Additionally, the M581 channel has 16 bytes of transmit and receive FIFOs, Automatic RTS/
CTS Hardware Flow Control, Automatic Xon/Xoff and Special Character Software Flow Control, infrared
encoder and decoder (IrDA ver 1.0 and 1.1), programmable fractional baud rate generator with a prescaler of
divide by 1 or 4, and data rate up to 20 Mbps. The XR16M581 can operate from 1.62 to 3.63 volts. The M581
is fabricated with an advanced CMOS process.
Data Rate
The M581 is capable of operation up to 20 Mbps at 3.3V with 4X internal sampling clock rate. The device can
operate at 3.3V with a 24 MHz crystal on pins XTAL1 and XTAL2, or external clock source of 80 MHz on XTAL1
pin. With a typical crystal of 14.7456 MHz and through a software option, the user can set the prescaler bit and
sampling rate for data rates of up to 3.68 Mbps.
Enhanced Features
The rich feature set of the M581 is available through the internal registers. Automatic hardware/software flow
control, programmable transmit and receive FIFO trigger levels, selectable baud rates, infrared encoder/
decoder, modem interface controls, and a sleep mode are all standard features. MCR bit-5 provides a facility
for turning off (Xon) software flow control with any incoming (RX) character. The M581 includes new features
such as 9-bit (Multidrop) mode, auto RS-485 half-duplex direction control, different baud rate for TX and RX,
fast IR mode and fractional baud rate generator.
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