METHOD TO ISOLATE REAL-TIME OR SAFETY-CRITICAL SOFTWARE AND OPERATING SYSTEM FROM NON-CRITICAL SOFTWARE AND OPERATING SYSTEM

A method is provided to isolate a secure operation region with a safety-critical software and real-time operating system from a non-secure operation region with non-critical software and general operating system including a non-secure mode, wherein the real-time operating system is inactivated and the general operating system is activated by a secure configuration register and wherein secure interrupts are mapped to fast processor interrupts calling a secure monitor program and non-secure interrupts are mapped to regular processor interrupts by a interface configuration register, and further including a secure mode, wherein the real-time operating system is activated and the general operating system is inactivated by the secure configuration register and wherein secure interrupts are mapped to regular processor interrupts calling the real-time operating system, fast processor interrupts are not used and non-secure interrupts are disabled by the interface configuration register.