NEC PD750008 - Manual (Page 226)

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µPD750008 USER'S MANUAL
(4) Execution of held interrupts (interrupt requests when interrupts are disabled)
<1> If INT0 is set when interrupts are disabled, the interrupt request flag is held.
<2> When the interrupt is enabled by the EI instruction, the INT0 interrupt service program starts.
<3> Same as <1>
<4> When the held INTCSI flag is enabled, the INTCSI interrupt service program starts.
RETI
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Reset
<2> EI
<1> INT0
<INT0 service program>
<3> INTCSI
EI IE0
RETI
<INTCSI service program>
EI IECSI <4>
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<Main program>
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