Hello all. When I look at the r4 minimim schematics, I see a 16Mhz quartz on it, but this board presentation says it works at 48 Mhz. So what's true ? Is it really a 16 Mhz quartz on the board ? If yes, does the board really running at 48 Mhz ? Thanks [image]

Hi @tonynyny . You might be interested in the related posts here: [image] Uno R4 schematic UNO R4 Minima Schematic shows 16mhz main oscillator crystal. This appears not fitted. Should that be indicared on schematic? 16mhz is too fast for PLL input, would 12mhz …

Thanks @ptillisch I already saw it, and I have just send the schematics there the post

[image] tonynyny: I see a 16Mhz quartz on it, but this board presentation says it works at 48 Mhz. It is common for such processors to have an internal PLL - so that they run internally at a multiple of the external clock frequency. (I don't know if it's actually the case here; just to note …

[image] awneil: internal PLL what's that ?? If we suppose it is the case, what is the advantage of doing that ? Use the internal clock isn't simpliest ?

[image] tonynyny: what's that ?? PLL = Phase-Locked Loop - essentially, a programmable frequency multiplier/divider. [image] tonynyny: what is the advantage For one thing, it means you don't need high-speed external clocks - where EMC concerns are higher. [image] tonynyny: Use th…

@tonynyny Please don't cross post on different sub-forum. Choose either to post here or on the french forum.

Sorry for the mistake, so I stop discuss here, If there are other question, it will be here, in french [image] Arduino uno R4 minima questions Français Bonjour à tous, je m'intérèsse depuis peu au nouvel arduino, surtout à l'uC de renessas processeur 32 bits …

Uno R4 minima quartz or not

Official Hardware UNO Family UNO R4 Minima

ptillisch August 23, 2023, 8:37am 2

Hi @tonynyny. You might be interested in the related posts here:

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Uno R4 minima quartz or not

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