NEC PD75P402 User Manual Page 151

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140
CHAPTER 6. INTERRUPT FUNCTIONS
(4) Pending interrupt execution
Reset
EI
EI
EI
IECSI
IE0
<Main Program>
INT0
INTCSI
RETI
RETI
<INTCSI Service Program>
<INT0 Service Program>
<Main Program>
If INT0 and INTCSI are generated simultaneously (during execution of the same instruction), INT0, which
has the higher interrupt priority, is executed first (INTCSI is held pending).
When the INT0 service program is ended by the RETI instruction, the pending INTCSI service program is
started.
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