In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mgreen wrote:

How are you connecting the LED?  Interrupt pins take very very little current and use the same voltage thresholds as any other pin.  Sometimes, when you have an LED on a chip's output, it pulls the voltage up or down (depending on how you've connected it) so that it's too high (or too low) to properly trigger the interrupt pin.  Try decreasing the LED current (by increasing the value of the current limiting resistor).  Many chips can only handle 10-20ma without the voltage going too high (or too low).

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