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My SuperPro is running my C program, until I plug in my external connector. The external connector supplies the power and Input signals, as well as the output loads. One of the Input signals is an interrupt.

I get an error message on TCLTerm. ISR Fault oxFFFFFFF1 SCB0x00002000. It appears that there is a proplem with the Interrupt handling.

What does that error message indicate?

That is the default interrupt routine, so your interrupt happened, it just went to the default code.

Which means your code never redirected the interrupt to your code.