User's Manual
207
CHAPTER 6 INTERRUPT AND TEST FUNCTIONS
(5) Execution of held interrupts – two interrupts with lower priority occur concurrently –
<1> When INT0 and INTT0 with the lower priority occur concurrently (during execution of the same
instruction), INT0, with a higher priority, is executed first. (INTT0 is held.)
<2> When the INT0 interrupt service program has been executed, the RETI instruction is executed to
start the interrupt service program for INTT0, which has been held.
Reset
<2> RETI
<INT0 service program>
<1>
EI IET0
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<Main program>
INT0
INTT0
EI IE0
EI
RETI
<INTT0 service routine>