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F29H850TU: LaunchPad resets unexpectantly

Part Number: F29H850TU

Tool/software:

I'm experiencing random resets on my F29H85 LaunchPad.

  • Monitoring the XRSn pin shows XRSn toggles low/high.
  • The RESC register does not show a cause.
  • The CPU can be halted when this happens. After the reset, the debug window displays "halt state removed due to reset". After the CPU will be "running". 
  • The CPU can be running when it happens. I've reproduced the issue with the blinky example.
  • The time between resets varies. Sometimes it is more often, sometimes less often.
  • Per offline debug, the LP boot mode switch was setup to Parallel GPIO boot mode. The LP was exhibiting this unstable behavior since the GPIOs used in boot mode were floating. Issue was resolved by setting the LP boot mode switch to flash boot. When using parallel GPIO boot mode the respective GPIOs must be connected to an actual host device.