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An instruction trace facility is valuable because it shows

  • A.the value of every variable at the moment of failure
  • B.the current consumption during each function
  • C.the contents of the flash memory after the fault
  • D.the path the program took before it failed

Answer: D

A fault that has already corrupted the stack leaves a breakpoint with nothing useful to say, whereas a trace buffer records how the program arrived there. It needs hardware support and a probe that can stream the data out.

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