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

To prevent any single software error from corrupting PIO behavior, certain registers in the address space can be 

write-protected by setting the WPEN bit in the 

 (PIO_WPMR).

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

 (PIO_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 PIO_WPSR.
The following registers can be write-protected:

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