Unspecified Register Access Detection

When an unspecified register access occurs, AES_ISR.URAD is raised. Its source is then reported in AES_ISR.URAT. Only the last unspecified register access is available through the AES_ISR.URAT.

Several kinds of unspecified register accesses can occur:

• Input Data register written during the data processing when SMOD = IDATAR0_START
• Output Data register read during data processing
• Mode register written during data processing
• Output Data register read during sub-keys generation
• Mode register written during sub-keys generation
• Write-only register read access

AES_ISR.URAD and AES_ISR.URAT can only be reset by AES_CR.SWRST.