NEC PD75402A - Manual (Page 150)

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CHAPTER 6. INTERRUPT FUNCTIONS
(3) Pending interrupt execution - interrupt input in interrupt disabled state
Reset
➂
INTCSI
<INT0 Service Program>
RETI
RETI
<INTCSI Service Program>
EI IE0
➀ INT0
<Main program>
➁
EI
➃
EI IECSI
➀ Although INT0 is set in the interrupt disabled state, the interrupt flag is held pending.
➁ The INT0 service program is started at point at which interrupts are enabled by the EI instruction.
➂ Same as ➀ .
The INTCSI service routine is started at the point at which the pending INTCSI is enabled. 4