CHKRES=pass, CCHK=complete, ICC0_FLUSH=normal
System Control.
| SBUSARB | System bus arbitration scheme. These bits are used to select between Fixed burst arbitration and Round Robin scheme. The Round Robin scheme is selected by default. |
| FPUS_DIS | Cortex M4 Floating Point Disable This bit is used to disable the floating-point unit of the Cortex-M4. |
| ICC0_FLUSH | Code Cache Flush. This bit is used to flush the code caches and the instruction buffer of the Cortex-M4. 0 (normal): Normal Code Cache Operation 1 (flush): Code Caches and CPU instruction buffer are flushed |
| CCHK | Compute ROM Checksum. This bit is self-cleared when calculation is completed. Once set, software clearing this bit is ignored and the bit will remain set until the operation is completed. 0 (complete): No operation/complete. 1 (start): Start operation. |
| SWD_DIS | Serial Wire Debug Disable. |
| CHKRES | ROM Checksum Result. This bit is valid when the checksum is done and the CCHK bit is cleared. 0 (pass): ROM Checksum Correct. 1 (fail): ROM Checksum Fail. |