Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Hoja De Datos
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AT91SAM9N12-EK
631
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
36.7.5 Write
Protected
Registers
To prevent any single software error that may corrupt SPI behavior, the registers listed below can be write protected by
setting the WPEN bit in the SPI Write Protection Mode Register (SPI_WPMR).
setting the WPEN bit in the SPI Write Protection Mode Register (SPI_WPMR).
If a write access in a write protected register is detected, then the WPVS flag in the SPI Write Protection Status Register
(SPI_WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted.
(SPI_WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted.
The WPVS flag is automatically reset after reading the SPI Write Protection Status Register (SPI_WPSR).
The protected registers are: