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30 Mar 2012
Atmel describes how to select and test 32.768 kHz quartz crystals [PDF!] for real-time clocks. The basic tips on layout apply to any microcontroller project, not just those with AVRs. [via]
This application note summarizes the crystal basics, PCB layout considerations, and how to test a crystal in your application. A crystal selection guide shows recommended crystals tested by experts and found suitable for various oscillator modules in different Atmel AVR families. Test firmware and test reports from various crystal vendors are included.
Selecting and testing 32kHz crystal oscillators - [Link]
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