What was the reason why the interrupt processing was not performed?

Please select the interrupt priority level from among 1 to 7 and set the I flag to "1(Interrupt Enable)".

In addition, in the description of the interrupt processing function in C language, you need to declare by "#pragma INTERRUPT interrupt function name" and register the interrupt to be used in the interrupt vector table in the section file（sect30.inc）.

Refer to "2.5 Interrupt Processing" in "Programming Guidelines C Language" for detail.

"Programming Guidelines C Language" can be downloaded from the Application Notes.