How to connect External Crystal to AVR32DA28

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I am trying to find any document on connecting External Crystal in AVR32DA28 and the XTAL32K2 and XTAL32K1 pins only supports 32 khz external crystal and any other value of crystal can be connected on EXTCLK pin but i can not figure out the way to connect the crystal on single pin. I know it might be a simple connection but i am new in this Embedded system so it will be really appreciable if someone can help me. The value i want to connect is 16MHZ Crystal.

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Judging from the data sheet, you can't connect a crystal to that device.

11.3.3.2.2 External Clock (EXTCLK)
The EXTCLK is taken directly from the pin. This GPIO pin is automatically configured for the EXTCLK if any peripheral requests this clock. The maximum input frequency for the EXTCLK is 24 MHz. This clock source has a start-up time of two cycles when first requested.

You need a dedicated crystal oscillator, which will provide an output that you can connect to EXTCLK.