Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK 数据表
产品代码
AT91SAM9X25-EK
503
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
31.6 Write Protection Registers
To prevent any single software error that may corrupt the DMAC behavior, the DMAC address space can be write-
protected by setting the WPEN bit in the
protected by setting the WPEN bit in the
(DMAC_WPMR).
If a write access to anywhere in the DMAC address space is detected, then the WPVS flag in the DMAC Write Protect
Status Register (MCI_WPSR) is set, and the WPVSRC field indicates in which register the write access has been
attempted.
Status Register (MCI_WPSR) is set, and the WPVSRC field indicates in which register the write access has been
attempted.
The WPVS flag is reset by writing the DMAC Write Protect Mode Register (DMAC_WPMR) with the appropriate access
key, WPKEY.
key, WPKEY.
The protected registers are: