CM312 datasheet(33/56 Pages) ETC

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CM312 Quad Serial utilityModule

RTD Embedded Technologies, Inc.

Chapter 3

USING THE UTILITYMODULE SERAIL PORTS

The utilityModule features an EXAR quad UART 16C550 compatible 16C554D part.

EXAR Documentation

Due to the complexity of the EXAR serial chip, it is impossible for us to reproduce all

programming information in this manual. If you will be doing in-depth programming of the serial

port controller, we suggest you obtain the 16C554D datasheet from the manufacturer.

The 16C554D datasheet is available on-line in electronic format as an Adobe Acrobat (. PDF) file

on the EXAR website:

www.exar.com

You may also contact:

EXAR corporation

248720 Kato Road

Fremont, CA 94538

Or by phone/fax:

Phone: 510 668 7017

Fax: 510 668 7017

1.5 Mbps support

With 24 MHz clock input selected (JP5, 1-2), the utilityModule is capable of provide data rates up

to 1.5 Mbps in RS422/RS485 mode. Since RS-232 standard restricts data rate to 20 Kbps, you

might experience failure at higher data rate above 252 Kbps with 24 MHz clock select for the

utilityModule.

CM312 Datenblatt(PDF) 33 Page - List of Unclassifed Manufacturers