7

NOTICE

EXAR Corporation reserves the right to make changes to the products contained in this publication in order

to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of

any circuits described herein, conveys no license under any patent or other right, and makes no represen-

tation that the circuits are free of patent infringement. Charts and schedules contained here in are only for

illustration purposes and may vary depending upon a user’s specific application. While the information in

this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.

EXAR Corporation does not recommend the use of any of its products in life support applications where

the failure or malfunction of the product can reasonably be expected to cause failure of the life support sys-

tem or to significantly affect its safety or effectiveness. Products are not authorized for use in such applica-

tions unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury

or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corpo-

ration is adequately protected under the circumstances.

Copyright 2004 EXAR Corporation

August 2004

Send your UART technical inquiry with technical details to hotline:

uarttechsupport@exar.com

Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.

5.0

SUMMARY

From the above discussion, it is clear that the XR16L784/788 devices have many advantages from both

hardware and software point of view. To sum up, these devices deliver higher performance through the fol-

lowing:

q

higher integration (one chip 788 vs. two chips 554/654/854’s)

s

less board space

q

simpler interface with the CPU

s

single chipselect

s

single interrupt to the CPU

q

ability to interface with both 3.3V and 5V devices

s

5V tolerant inputs (all inputs except XTAL1)

q

less CPU bandwidth requirement (faster interrupt parsing)

s

Global Interrupt Registers for quicker interrupt service