R01UH0823EJ0100 Rev.1.00 Page 258 of 1823
Jul 31, 2019
RX23W Group 14. Exception Handling
14. Exception Handling
14.1 Exception Events
During execution of a program by the CPU, the occurrence of a certain event may cause execution of that program to be
suspended and execution of another program to be started. Such kinds of events are called exception events.
The RXv2 CPU supports eight types of exceptions. The types of exception events are shown in
Figure 14.1.
The occurrence of an exception causes the processor mode to shift to supervisor mode.
Figure 14.1 Types of Exception Events
Exception events
Undefined instruction exception
Privileged instruction exception
Access exceptions
Floating-point exception
Reset
Non-maskable interrupt
Interrupt
Unconditional trap