Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK データシート

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SAM9X25 [DATASHEET]

11054E–ATARM–10-Mar-2014

To prevent any single software error that may corrupt PIO behavior, certain address spaces can be write-protected by 
setting the WPEN bit in the 

If a write access to the protected registers is detected, then the WPVS flag in the PIO Write Protect Status Register 
(PIO_WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted.

The WPVS flag is reset by writing the PIO Write Protect Mode Register (PIO_WPMR) with the appropriate access key, 
WPKEY.

The protected registers are:

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