CPUC controls elements of the Arm® Cortex®-M33 processor such as lock certain features of the CPU and prevent them from being modified.
CPUC holds a CPU identifier CPUID, used in the system to uniquely identify the processing unit of a core.
In addition, CPUC holds a LOCK register, which is used to lock certain CPU features and prevent them from being modified. One example is the LOCK.LOCKSAU field. When set to Locked, this prevents further modifications to the SAU registers.