Timer interrupts - Frequency, PWM and Duty Cycle

i have been reading many tutorials , posts on timers , still little confused.

i want produce square wave have control of both frequency , duty cycle of square wave.

i understand prescaler etc. ocr1a etc. seems used duty cycle , adjusting exact frequency prescaler values.

could explain how done. appreciate snippet of code if possible.

thanks

have read atmega datasheet whatever processor using? - uno uses atmega328. contains lot of information.

you might @ arduino code analogwrite(). presumably can want modifying code.

...r

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