ARM Cortex R4F - Manual (Page 341)

Debug
ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 11-72
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• Attaching the debugger for a postmortem debug session is not possible because setting the
DBGNOPWRDWN signal to 1 might not cause the processor to power up. The effect of
setting DBGNOPWRDWN to 1 when the processor is already powered down is
implementation-defined, and is up to the system designer.