AVR32DA28/32/48

11.3.3.2 External Clock Sources

These external clock sources are available:

External clock from a pin (EXTCLK)
The XTAL32K1 and XTAL32K2 pins are dedicated to driving a 32.768 kHz crystal oscillator (XOSC32K)
Instead of a crystal oscillator, XTAL32K1 can be configured to accept an external clock source

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