These first three types are differentiated by their priorities. The reset interrupt has the highest priority and corresponds to the RESET signal. The nonmaskable interrupt (NMI) has the second highest priority and corresponds to the NMI signal. The lowest priority interrupts are interrupts 4-15 corresponding to the INT4-INT15 signals. RESET, NMI, and some of the INT4-INT15 signals are mapped to pins on C6000 devices.
The CPU supports exceptions as another type of interrupt. When exceptions are enabled, the NMI input behaves as an exception.