Square wave in different frequencies ?

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i know subject came up, still there no 1 truth in google
i able output square ( or pwm) on digital pin , , set frequency 0-20khz .

is there library ? can done in background using timers ? affect millis() ?

seems there no pure solution- 1 that, , not affecting whole system.
 
thanks.

tone(pin,20000);  // min freq 31 hertz

https://www.arduino.cc/en/reference/tone




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