ARM Technical Support Knowledge Articles

Unable to program the Data Watchpoint Unit / Data Watchpoint and Trace Unit (DWT)

Applies to: Cortex-M0, Cortex-M3, Cortex-M4

Answer

The DWT is accessible only when bit[24] of the Debug Exception and Monitor Control Register (DEMCR) is set.

In ARMv6-M, this bit is called DEMCR.DWTENA

In ARMv7-M, this bit is called DEMCR.TRCENA

Rate this article

[Bad]
|
|
[Good]
Disagree? Move your mouse over the bar and click

Did you find this article helpful? Yes No

How can we improve this article?

Link to this article
Copyright © 2011 ARM Limited. All rights reserved. External (Open), Non-Confidential