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Clarify analog output doc for pwm limits #6051

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May 5, 2019
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Clarify analog output doc for pwm limits #6051

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Update reference.rst
devyte May 5, 2019
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8 changes: 7 additions & 1 deletion doc/reference.rst
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Expand Up @@ -70,7 +70,13 @@ equal to 1023 by default. PWM range may be changed by calling
``analogWriteRange(new_range)``.

PWM frequency is 1kHz by default. Call
``analogWriteFreq(new_frequency)`` to change the frequency.
``analogWriteFreq(new_frequency)`` to change the frequency. Valid values
are from 100Hz up to 40000Hz.

The ESP doesn't have hardware PWM, so the implementation is by software.
With one PWM output at 40KHz, the CPU is already rather loaded. The more
PWM outputs used, and the higher their frequency, the closer you get to
the CPU limits, and the less CPU cycles are available for sketch execution.

Timing and delays
-----------------
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