5.3 Peripherals
5.3.1 Crystals
SAM E54 Xplained Pro has a 32.768 kHz and a 12 MHz crystal that can be used as clock source for the
SAM E54 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 are available in the AVR4100 application note.
The 32.768 kHz crystal on SAM E54 Xplained Pro is a Kyocera Crystal Device Corporation
ST3215SB32768A0HPWBB 5pF crystal. The crystal has been matched to be driven in high drive mode
by the SAM E54.
The 12 MHz crystal on SAM E54 Xplained Pro is a Kyocera Crystal Device Corporation
CX3225CA12000D0KPSC1. The crystal has been matched to be driven with Automatic Loop Control
enabled in the SAM E54.
Both crystals have been formally tested and matched to the SAM E54 by Kyocera. The test reports are
available in the design documentation distributed with this document for SAM E54 Xplained Pro.
Info: Kyocera Crystal Device Corporation crystals that are matched with specific products can
be found on their web site: http://prdct-search.kyocera.co.jp/crystal-ic/?p=en_search/
Table 5-12. External 32.768kHz Crystal
SAM E54 pin Function
PA00 XIN32
PA01 XOUT32
Table 5-13. External 12MHz Crystal
SAM E54 pin Function
PB22 XIN1
PB23 XOUT1
Related Links
Design Documentation and Relevant Links
5.3.2 Mechanical Buttons
SAM E54 Xplained Pro contains two mechanical buttons. One button is the RESET button connected to
the SAM E54 reset line and the other is a generic user configurable button. When a button is pressed it
will drive the I/O line to GND.
Info: There is no pull-up resistor connected to the generic user button. Remember to enable
the internal pull-up in the SAM E54 to use the button.
SAM E54 Xplained Pro
© 2017 Microchip Technology Inc.
DS70005321A-page 24
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