Hi Frank First thank you for the feedback. Not a stupid question. I did not, I was unaware that I had to manually do this when setting up an interrupt from an external pin. I had thought the PSW was just an indication register and did not need to be set except for maybe IPL[3:0] which are set to 0. It is currently showing 0. I will set b16 to 1 and see what happens and let you know. Thank you again for your suggestion.
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