Техническая Спецификация для Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK
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Модели
AT91SAM9G25-EK
230
SAM9G25 [DATASHEET]
11032D–ATARM–10-Mar-2014
23.5.15 Write Protection Registers
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
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.
(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.
WPKEY.
The protected registers are: