AHB multilayer matrix priority control
| PRI_ICODE | I-Code bus priority. Should be lower than PRI_DCODE for proper operation. |
| PRI_DCODE | D-Code bus priority. |
| PRI_SYS | System bus priority. |
| RESERVED | Reserved. Read value is undefined, only zero should be written… |
| PRI_DMA | DMA controller priority. |
| RESERVED | Reserved. Read value is undefined, only zero should be written… |
| PRI_FIFO | System FIFO bus priority |
| PRI_M0 | Cortex-M0+ bus priority. |
| RESERVED | Reserved. Read value is undefined, only zero should be written… |