Datasheet

691
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
32.7.5 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).
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.
The WPVS flag is automatically reset after reading the SPI Write Protection Status Register (SPI_WPSR).
List of the write-protected registers:
Section 32.8.2 ”SPI Mode Register”
Section 32.8.9 ”SPI Chip Select Register”