Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet

309

SAM9X25 [DATASHEET]

11054E–ATARM–10-Mar-2014

To prevent any single software error from corrupting MATRIX behavior, certain registers in the address space can be 
write-protected by setting the WPEN bit in the 

 (MATRIX_WPMR).

If a write access to a write-protected register is detected, the WPVS flag in the 

 

(MATRIX_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted.

The WPVS bit is automatically cleared after reading the MATRIX_WPSR.

The following registers can be write-protected:

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