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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, I'm not sure if it can be worked around :(
It's not specific to the Cortex M because the Nordic chips don't have the limitation (you can attach an interrupt to any pin - but then you have less interrupts in total). While STM32F1/F4 have the issue I wonder whether maybe some other ST devices don't.