Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Scheda Tecnica

801

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

To prevent any single software error that may corrupt USART behavior, certain address spaces can be write protected by
setting the WPEN bit in the USART Write Protect Mode Register (US_WPMR).

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

The WPVS flag is automatically reset by reading the US_WPMR with the appropriate access key (WPKEY).

The protected registers are:

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