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2.8 EIT (Exception, Interrupt, and Trap)
Figure 2.8.2 shows an example of multiple EIT processing.
Figure 2.8-2 Example of Multiple EIT Processing
Table 2.8-5 EIT Handler Execution Order
Handler execution order Event
1 Reset (*1)
2 Undefined-instruction exception
3 Step-trace-trap *
2
4 INTE instruction *
2
5 NMI (for user)
6INT instruction
7 User interrupt
8 Coprocessor nonexistent trap
Coprocessor error trap
*1: The other EIT events are discarded.
*2: The INTE instruction cannot be used in an environment where a step-trace-trap
EIT event occurs.
Main routine
NMI handler
INT instruction
handler
Priority
(High) NMI occurrence
(Low) INT instruction
execution
Executed first
Executed next