-

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.

-

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

-

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

-

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