Crystals

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.

Info: Kyocera Crystal Device Corporation crystals matched with specific products can be found on their website: http://prdct-search.kyocera.co.jp/crystal-ic/?p=en_search/.
Table 1. External 32.768 kHz Crystal
ATmega4809 Pin Function
PF0 XIN32
PF1 XOUT32