Clear clears flags specified by fl.

Select selects region number n.

Set sets flags specified by fl.

Type returns information about MPU unit: i - number of supported instruction regions, d - number of supported data regions.

No access.

Use to extract access permission bits.

Priv-RO.

Priv-RO, Unpriv-RO.

Priv-RW.

Priv-RW, Unpriv-RO.

Priv-RW, Unpriv-RW.

Bufferable.

Cacheable.

Enables region.

If ENABLE is set MPU is enabled.

If HFNMIENA is not set the MPU will be disabled during HardFault, NMI and FAULTMASK handlers.

If PRIVDEF is set the default memory map is used as background region for privileged software access.

Shareable.

Instruction access disable.