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Résolution PWM / timer

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Exemple Fréquence PWM = 976.6 Hz — period 1.024 ms

Exemple 256 duty steps ≈ 8 bits of resolution — one step = 4 µs

A hardware timer counts clock ticks through a prescaler up to TOP, then wraps: $f=\frac{\mathrm{horloge}}{\mathrm{prescaler}\times (\mathrm{TOP}+1)}$. Those TOP + 1 counts are also the duty steps: $\mathrm{bits}={\log }_2(\mathrm{TOP}+1)$. Bigger TOP = finer duty steps but lower frequency — this shows the trade.