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This instruction returns execution from the fast-interrupt handler by restoring the PC and PSW contents that were saved in the BPC and BPSW when the fast interrupt request was accepted.

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This instruction is a privileged instruction. Attempting to execute this instruction in user mode generates a privileged instruction exception.

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If returning is accompanied by a transition to user mode, the U bit in the PSW becomes 1.

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The data in the BPC and BPSW are undefined when instruction execution is completed.

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This instruction sets the LI flag within the CPU to 0 if you have specified the assembler option -isa with selection of the instruction set of the RXv2 or a later version. [V2.01.00 or later]