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Originally Posted by Rickertsen2
I am not 100% sure, but am fairly sure that it is never disabled to begin with, and you should be able to nest interrupts as is.
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I need to dig into the manual a bit more. Clearly global interrupts are not disabled, because the system needs to service high priority interrupts. However, to nest low priority interrupts I would need to re-enable the low interrupt - and clear whatever interrupt I am servicing & so forth.