SPRUJ53C April 2024 – February 2025 TMS320F28P550SG , TMS320F28P550SJ , TMS320F28P559SG-Q1 , TMS320F28P559SJ-Q1
There is a special NMI source that can only be triggered by writing to the SWERR bit in the NMIFLGFRC register. Since the SWERR flag is never set by a real hardware fail, it can be used to implement a self-test mode for the NMI subsystem.