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

Bean is correct - it is a "feature" of the internal debugging code that you can't set breakpoints on NOP instructions. On the other hand, the IDE should not come up with a run-time error in such cases.

BTW, you also can't set a breakpoint on the very last instruction line, like in

; some instructions
jmp Loop

a breakpoint on jmp Loop would not work. As a work-around, simply follow the last instruction with one more dummy instruction (but don't use a NOP), like

; some instructions
jmp Loop
mov w, #0

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