Basic Instructions
2 − 87
Nesting of subroutines is possible until the 5th nesting.
SUB 0
CALL1
RET
(Stage 2)
SUB 1
CALL2
RET
Called up from inside of the subroutine.
5th nesting example
(Stage 3)
SUB 2
CALL3
RET
(Stage 4)
SUB 3
CALL4
RET
(Stage 5)
SUB 4
RET
Flag conditions
・Error flag (R9007): Turns on and stays on when performing five nestings and executing the
CALL instruction for the subroutine of the 5th nesting.
・Error flag (R9008): Turns on for an instant when performing five nestings and executing the
CALL instruction for the subroutine of the 5th nesting.
Precautions during programming
In the interrupt program, a subroutine program cannot be used.
SUB 21
RET
IRET
INT 1
Subroutine
In the subroutine program, an interrupt program cannot be used.
Interrupt program
INT 0
IRET
RET
SUB 21
Subroutine
For the FP0/FP−e, subroutine program cannot be written inside another subroutine program.
SUB 2
RET
SUB 0
Subroutine program
Subroutine
program
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