In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

Check out Peter's (pjv) submission to the SX contest, he uses undocumented SX assembly instructions within the ISR to mess with the stored context (FSR, Status etc) then RETIs but because the context has been changed, the ISR returns to a position he has specified. He uses this method to implement a task switching multiprocessor, but you could use the same technique to do what you want, its just a little more involved than using a JMP.

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