31-4 | Reserved | 0 | Reads return 0. Writes have no effect. |
3-0 | MKEY1 | | Mode Key to select operation for CPU Output Compare Diagnostic . |
| Read in User and Privileged mode. Write in Privileged mode only. |
0 | Read: Returns current value of the MKEY1. |
| Write: Active Compare Lockstep mode. |
6h | Read: Returns current value of the MKEY1. |
| Write: Self-test mode. |
9h | Read: Returns current value of the MKEY1. |
| Write: Error Forcing mode. |
Fh | Read: Returns current value of the MKEY1. |
| Write: Self-test Error Forcing mode. |
Other values | Note: It is recommended to not write any other key combinations. Invalid keys will result in switching operation to lockstep mode. |