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A microcontroller runs correctly from its internal oscillator but fails intermittently on a crystal. The first thing to check is

  • A.the load capacitors and the crystal's specified drive level
  • B.the setting of the watchdog timer
  • C.the placement of the interrupt vector table
  • D.the volatile qualifiers on the peripheral registers

Answer: A

Wrong load capacitance or excessive drive gives an oscillator that starts unreliably or runs at the wrong frequency, and layout matters as much as component value. The other three would fail identically on either clock source.

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