Depending on where in code-memory your routine is placed use can use SJMP, AJMP or LJMP. Many assemblers accept that you write just JMP and the assembler makes the calculation which one to use. I recommend that you read the "bible", address in LINKS to the left, where you can find out what differs between the three different jumps. OBS OBS you have to exit your routine with RETI to restore your interrupt status.

Anders