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Damien George authored
Eg pyb.freq(120000000) sets the CPU to 120MHz. The frequency can be set at any point in the code, and can be changed as many times as you like. Note that any active timers will need to be reconfigured after a freq change. Valid range is 24MHz to 168MHz (but not all freqs are supported). The code maintains a 48MHz clock for the USB at all times and it's possible to change the frequency at a USB REPL and keep the REPL alive (well, most of the time it stays, sometimes it resets the USB for some reason). Note that USB does not work with pyb.freq of 24MHz.
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