Panasonic FP-E Programming Manual page 1047

Program example
This is a program in which the index register bank is switched to "2" at the beginning of the interrupt program,
and is then switched back again to the original index register bank just before the end of the interrupt program
(before the IRET instruction).
END
INT 0
R9010
F411 CHGB, H2
R9010
F412 POPB
IRET
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
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Main program
Sub program
Turns on and stays on when:
Turns on for an instant when:
− The area specified using the index modifier exceeds the limit.
− The bank number is not from K0 to K15.
High−level Instructions
3 − 783