Panasonic FP-E Programming Manual page 226

Basic Instructions
Example for clearing interrupt programs
Example:
[S1]: H0100
Clears interrupts from the interrupt unit (INT 0 to INT15).
[S2]: HFFFE
Clears interrupt INT0 (bit 0 is "0") and does not clear the other
interrupts.
For the relationship between the set value and the interrupt
unit, refer to page 2 − 114 "Example of enabling the execution
of interrupt programs."
Even though the INT0 interrupt input occurred, when the
interrupt program is disabled, the ICTL instruction can still be
used to clear the INT0 interrupt.
Main program
INT0 program
INT8 program
INT0 input
INT8 input
Condition
Since INT0 is cleared, the INT0 program will not be executed
even after execution is enabled. Since INT8 is not cleared, the
INT8 program will be executed after execution is enabled.
2 − 116
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DF ICTL, H100, HFFFE
S1
S2
ICTL instruction
Execution
Clear
on
off
on
off
Disabled
Execution
Execution
Enabled
FP2/FP2SH/FP10SH