Hi,
The expected values for the 'MS' field is given in the 'Table 22-1. Bus Masters for Access and Protection Control' of the device datasheet.
'PC' refers to the Protection Context of the current Bus master. It is used to restrict access to memory and peripheral resources. The value depends on how Memory Protection Unit is configured for that particular core. It ranges from 0 to 7. For more information on PC refer to the 'Protection Context' section of the device Architecture TRM.
