ATmega4809 Xplained Pro has a 32.768 kHz crystal that can be used as clock source for the ATmega4809 device. There are cut-straps located close to the crystals that can be used to measure the oscillator safety factor. This is done by cutting the strap and adding a resistor across the strap. More information about oscillator allowance and safety factor is available in the AVR4100 application note.
The 32.768 kHz crystal on ATmega4809 Xplained Pro is a Kyocera Corporation ST3215SB32768C0HPWBB 7 pF crystal.
The crystal has been formally tested and matched to the ATmega4809 by Kyocera. The test report is available in the design documentation distributed with this document for ATmega4809 Xplained Pro.
| ATmega4809 Pin | Function |
|---|---|
| PF0 | XIN32 |
| PF1 | XOUT32 |