NEC PD754144 - Manual (Page 209)

CHAPTER 7 INTERRUPT AND TEST FUNCTIONS
209 User’s Manual U10676EJ3V0UM
(5) Executing pending interrupt - two interrupts with lower priority occur simultaneously -
Reset
EI IET0
EI IE0
EI
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INT0
INTT0
<1>
<2> RETI
RETI
<1> If INT0 and INTT0 with a lower priority occur at the same time (while the same instruction is being
executed), INT0 with a higher priority is executed first (INTT0 is held pending).
<2> When the INT0 servicing routine is terminated by the RETI instruction, the pending INTT0 servicing
program is started.