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Externally clocking (and overclocking) AVR MCUs

People familiar with AVR boards such as Arduinos likely know most AVR MCUs can be clocked from an external crystal connected to 2 of the pins.  When the AVR does not need to run at a precise clock frequency, it is also common to clock them from the internal 8Mhz oscillator.  Before CPUs were made with internal oscillators or inverting amplifiers for external crystals, they were clocked by an external circui ...

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