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Thank you all for your help, it finally worked. I can't thank you enough Very Happy

What does your external interrupt circuit look like ? It should be similar
to the schematic below. Pin B0 is held at a logic high level by the pullup.
When you press the button it goes to a logic ...

Let me try that and I'll let you know what happens, thank you so much for your time.

Hi guys:
I've just started working with microcontrollers and we're learning how to make external interrupts work out.
Allegedly, this is supposed to function as it is written but it does anything.
...