How do you troubleshoot a PIC® device that runs in debug mode but not in normal mode?

Here are some suggestions to troubleshoot a system that does not run by itself, but works when driven by a debugger:

  1. MCLR low causing the PIC® device to be held in reset or a latch-up condition where the PIC device wasn't powered up properly according to the VDD specifications.
  2. Check the internal oscillator on the CLKOUT pin to see if it is running.
  3. Test a simple program toggling a pin, perhaps a different pin, and see if this works in the same setup.
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