XONEIF=B_0x0, KEIF=B_0x0, SEIF=B_0x0
OTFDEC interrupt status register
| SEIF | Security Error Interrupt Flag status This bit is set by hardware and read only by application. Bit is set when at least one security error has been detected (illegal access to keys, illegal write on locked configuration). Bit is cleared when application sets in OTFDEC_ICR the corresponding bit to “1”. 0 (B_0x0): No security error status. No interrupt pending. 1 (B_0x1): Security error flag status, with interrupt pending. Actual interrupt generation is dependent on OTFDEC_IER corresponding bit SEIE. |
| XONEIF | Execute-only execute-Never Error Interrupt Flag status This bit is set by hardware and read only by application. Bit is set when a read access and not an instruction fetch is detected on any encrypted region with MODE bits set to 00 or 11. It is also set when an instruction fetch and not a read access is detected on any encrypted region with MODE bits set to 01. Bit is cleared when application sets in OTFDEC_ICR the corresponding bit to “1”. 0 (B_0x0): No execute-only error status. No interrupt pending. 1 (B_0x1): Read access detected on one region with MODE bits set to 00 or 11, or execute access detected on one region with MODE bits set to 01. OTFDEC returns a zeroed value for the illegal access, and an optional interrupt is generated if bit XONEIE is set to “1” in OTFDEC_IER register. |
| KEIF | Key Error Interrupt Flag status This bit is set by hardware and read only by application. Bit is set when a read access occurs on any encrypted region following the reset of the key registers by an abort event (tamper detection, unauthorized debugger connection, untrusted boot, RDP level regression). Bit is cleared when application sets in OTFDEC_ICR the corresponding bit to “1”. After KEIF is set any subsequent read to any enabled encrypted region returns a zeroed value. This state remains until OTFDEC keys are initialized again. 0 (B_0x0): OTFDEC is operating properly. 1 (B_0x1): Read access detected on an enabled encrypted region following an abort event. OTFDEC returns a zeroed value for the read, and an optional interrupt is generated if bit KEIE is set to “1” in OTFDEC_IER register. |