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Will a debugger prevent entering Deep Software Standby?

I'm using an RA6M3 connected to IAR's EWARM IDE via a J-Link Ultra+. I've read the Low Power Mode section of the RA6M3 user's manual and have looked at the register values and I think I have everything configured correctly. However, when I single-step through my code, it just steps right over the WFI instruction. I would expect the WFI to never return. The debugger would only resume after the device has reset out from the deep software standby state.

Before I pull out more hair, I thought I'd check to see if it is the debugger itself that is preventing the RA6M3 from entering deep software standby.

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