NEC switch - Manual (Page 177)

CHAPTER 11 INTERRUPT FUNCTIONS
User’s Manual U12978EJ3V0UD
177
11.4.4 Interrupt request hold
If an interrupt (such as a maskable, non-maskable, or external interrupt) is requested when a certain type of
instruction is being executed, the interrupt request will not be acknowledged until the instruction is completed. Such
instructions include:
• Instructions that manipulate interrupt request flag registers 0 and 1 (IF0 and IF1)
• Instructions that manipulate interrupt mask flag registers 0 and 1 (MK0 and MK1)