MPU Region Attribute and Size Register
| ENABLE | Region enable bit. |
| SIZE | Specifies the size of the MPU protection region. |
| SRD | Subregion disable bits. |
| B | MPU access permission attributes. |
| C | MPU access permission attributes. |
| S | Shareable bit. |
| TEX | MPU access permission attributes. |
| AP | Access permission field. |
| XN | Instruction access disable bit. |