App note: Crystal oscillator troubleshooting guide

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App note from NXP Semiconductors dealing with oscillators in microcontrollers. Link here (PDF)

Most microcontrollers can use a crystal oscillator as their clock source. Other options include external canned oscillators, resonators, RC oscillators, and internal clocks. The main advantages of a crystal oscillator are frequency accuracy, stability, and low power consumption. However, high reliability is needed to fully benefit from these advantages.

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