NEC PD78F9488 - Manual (Page 306)

CHAPTER 16 INTERRUPT FUNCTIONS
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16.4.4 Putting interrupt requests on hold
If an interrupt request (such as a maskable, non-maskable, or external interrupt) is generated when a certain type
of instruction is being executed, the interrupt request will not be acknowledged until the instruction is completed. Such
instructions (interrupt request pending instructions) are as follows.
• Instructions that manipulate interrupt request flag registers (IF0 to IF2)
• Instructions that manipulate interrupt mask flag registers (MK0 to MK2)