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

Running it in a car (NOISY power) means you should _definitely_ use a regulator and filter circuit; maybe even an LC circuit upstream of the power supply to cut down on the noise.  It is not the SX's fault here; you've stated that it works in one place but not another -- the only thing that changed are your connections.  You really should get a regulator and consider reviewing and reconnecting everything else.  One of my friends was having trouble today until he pulled his circuit apart and reconnected -- it started working.

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