SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
The Key Write Area register defines where the keys must be written in the key store RAM. After writing the Key Write Area register, the key-store module is ready to receive the keys using a DMA operation. If the key data transfer triggered an error in the key store, the error is available in the interrupt status register, IRQSTAT, after the DMA is finished. The key store write-error, KEY_ST_WR_ERR, is asserted when the programmed or selected area is not completely written. This error is also asserted when the DMA operation writes to RAM areas that are not selected.
For more details, see Section 13.9.1.