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Update analog.rst (#1756)

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Added text about specific dependencies between analogWriteRange and analogWriteFreq
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palmerr23 2023-10-08 01:47:20 +11:00 committed by GitHub
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docs/analog.rst
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@ -40,7 +40,9 @@ Analog Output Restrictions
--------------------------
The PWM generator source clock restricts the legal combinations of
frequency and ranges. For example, at 1MHz only about 6 bits of range
frequency and ranges.
At a CPU frequency of 133MHz, the 16 bit maximum range decreases by 1 bit for every doubling of the default PWM frequency of 1 kHz.
For example, at 1MHz only about 6 bits of range
are possible. When you define an ``analogWriteFreq`` and ``analogWriteRange``
that can't be fulfilled by the hardware, the frequency will be preserved
but the accuracy (range) will be reduced automatically. Your code will