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(c) When multiple interrupt factors occur simultaneously in the interrupt program execution
enabled status
The interrupt programs are executed in the order of interrupt pointers (I ) with high priority.
(
Section 9.11.1)
Other interrupt programs have to wait until processing of the interrupt program being executed is
completed.
(d) When the same interrupt factor as that of the interrupt program being executed occurs
When the same interrupt factor as that of the interrupt program being executed occurs more than
one time before completion of interrupt program processing, the interrupt factors of I0 to I15, I45,
and I50 to I255 are stored only once, and then the interrupt program corresponding to each stored
interrupt factor is executed after completion of current interrupt program execution
.
The interrupt factors of I28 to I31 and fixed scan execution type programs are all stored, and then all
the interrupt programs corresponding to interrupt factors are executed after completion of current
interrupt program execution.
Figure 2.13 When multiple interrupt factors occur simultaneously
Main routine
program
Interrupt
program (I50)
Interrupt
enabled (EI)
Simultaneous occurrence of
multiple interrupt factors
Execution
Execution
Execution
Interrupt
program (I100)
Wait to be
processed
Wait to be processed
Interrupt
program (I150)
IRET
IRET
IRET
I50 I100
I150
Low
Priority
High