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This can be used to configure the ADC window interrupt on the SAMD21. It uses OSCULP32K via GCLK6 to clock the ADC while in sleep mode (the same as used for the EIC). Note that attachAdcInterrupt()/detachAdcInterrupt() should be called immediately before/after LowPower.sleep() otherwise analogRead() will not work as expected. There is also an example (AdcWakeup.ino) which is much like the ExternalWakeup example but uses the ADC interrupt instead.