[bsder]

> I'm not sure why you'd want an interpreted language on a microcontroller

Using a microcontroller to interrogate itself is a really valuable debugging technique.

Generally, you have attach to a UART port and attach a terminal emulator. This is especially important when considering the plethora of sleep modes that now exist for modern SoCs. Debug probes generally put the chip in maximum performance mode which often wipes out the state your trying to debug (especially important for sleep bugs).