ARM Cortex-M0 - Page 40

Programmers Model
3-10 Copyright © 2009 ARM Limited. All rights reserved. ARM DDI 0432C
Non-Confidential ID112415
Note
Regions not marked as suitable for code behave as Execute-Never (XN) and generate a
HardFault exception if code attempts to execute from this location.
See the ARMv6-M ARM for more information about the memory model.