Chapter 9 Memory Protection Unit; About The Mpu - ARM Cortex-M3 Technical Reference Manual

Memory Protection Unit
9.1

About the MPU

9-2
The MPU is an optional component for memory protection. The processor supports the
standard ARMv7 Protected Memory System Architecture (PMSAv7) model. The MPU
provides full support for:
• protection regions
• overlapping protection regions, with ascending region priority:
— 7 = highest priority
— 0 = lowest priority.
• access permissions
• exporting memory attributes to the system.
MPU mismatches and permission violations invoke the programmable-priority
MemManage fault handler. For more information, see Memory Manage Fault Address
Register on page 8-40.
You can use the MPU to:
• enforce privilege rules
• separate processes
• enforce access rules.
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