NEC Network Controller uPD98502 User Manual
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Preliminary User’s Manual S15543EJ1V0UM
2.5.4.3 Priority of exceptions
While more than one exception can occur for a single instruction, only the exception with the highest priority is
reported. Table 2-38 lists the priorities.
Table 2-38. Exception Priority Order
High
↑
↓
Low
Cold Reset
Soft Reset
NMI
Address Error (instruction fetch)
TLB/XTLB Refill (instruction fetch)
TLB Invalid (instruction fetch)
Bus Error (instruction fetch)
System Call
Breakpoint
Coprocessor Unusable
Reserved Instruction
Trap
Integer Overflow
Address Error (data access)
TLB/XTLB Refill (data access)
TLB Invalid (data access)
TLB Modified (data write)
Watch
Bus Error (data access)
Interrupt (other than NMI)
Hereafter, handling exceptions by hardware is referred to as "process", and handling exception by software is
referred to as "service".