 Hence the interrupt service routine must retrieve a copy of the saved status register from where it was pushed onto the stack and check the status of the flag in order to distinguish between an and a .This requirement is eliminated when operating the 65C802/65C816 in native mode, due to the separate vectors for the two interrupt types.The 65C816's interrupt input is intended to provide the means to redirect program execution when a hardware exception is detected, such as a page fault or a memory access violation.