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

1) It could reset or "go haywire" or even be permanently damaged.  It all depends on how much current is available and what power supply filtering is present.  Devices like the SX are simply not designed to withstand power supply voltages beyond their Absolute Maximum Supply Voltage or any reverse supply voltage.

2) Pretty much any regulator can be damaged from voltages above around 36V.  Read the datasheet for the regulator for the Absolute Maximum Input Voltage.  Above this voltage, nothing is certain.  The regulator may be destroyed and may allow the high voltage surge to destroy connected circuitry.  Who knows?

3) It looks like you need some protective circuitry including a varistor and some extra input filtering

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