8
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 representation 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 system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications 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 Corporation is adequately
protected under the circumstances.
Copyright 2010 EXAR Corporation
Datasheet December 2010.
Send your UART technical inquiry with technical details to hotline:
.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
XR20M1280 EVALUATION BOARD USER’S MANUAL
REV. 1.0.0
2.0 DRIVERS
For the I
2
C/SPI UART driver, it is recommended that you contact your microcontroller vendor first for sample
code to access devices on the I
2
C or SPI bus. Once you can access devices on the I
2
C or SPI bus, you can
use the sample code from EXAR for initializing the I
2
C/SPI UART as a reference for devoloping your driver.
3.0 SAMPLE INITIALIZATION ROUTINE AND SUPPORT
For a sample initialization routine or if there are any questions, send an e-mail to [email protected].
J39
Routing for GPIO9-13
Trace between 1&2
Trace between 3&4
Trace between 5&6
Trace between 7&8
No trace between 9&10 (jumper installed)
J40
Routing for GPIO8-4
Trace between 1&2
Trace between 3&4
Trace between 5&6
Trace between 7&8
No trace between 9&10 (jumper installed)
T
ABLE
5: J
UMPER
S
ETTINGS
F
OR
XR20M1280IL40
J
UMPERS
F
UNCTIONS
C
OMMENTS
