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Topic: Atmega External Crystals... (Read 1 time) previous topic - next topic

dhenry

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If your avr is configured for full range crystal, it should have no problem working with 20Mhz crystals: those crystals are very easy to start.

Crystals are simply a l/c tank: it consists of serial inductor / capacitance / resistance. The oscillator itself has negative feedback (it is an inverter / NAND gate). The crystal oscillates by providing a phase shift so that the whole negative feedback loop becomes positive feedback.

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