Техническая Спецификация для Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO

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SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

The exception mask registers disable the handling of exceptions by the processor. Disable exceptions where they 

might impact on timing critical tasks. 
To access the exception mask registers use the MSR and MRS instructions, or the CPS instruction to change the 

value of PRIMASK or FAULTMASK. See 

, 

 for more information.