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MPAE-2336 editorial update
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egilro authored and carlehe committed Aug 31, 2020
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# Getting Started with External High-Frequency Oscillator on AVR® DB MCUs

The High Frequency Crystal Oscillator (XOSCHF) enables the use of an external crystal or an external clock signal up to 32MHz. This can be used as a clock source for the Main Clock (CLK_MAIN), the Real-Time Counter (RTC) and the 12-Bit Timer/Counter Type D (TCDn).
The High Frequency Crystal Oscillator (XOSCHF) enables the use of an external crystal or an external clock signal up to 32 MHz. This can be used as a clock source for the Main Clock (CLK_MAIN), the Real-Time Counter (RTC) and the 12-Bit Timer/Counter Type D (TCDn).

The Clock Failure Detection (CFD) feature can be used to detect if the output from a clock source stops and can switch the Main Clock to a different clock source to continue operation or shut down operation safely.

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