understanding analogWrite

I am not too sure how to word this. I am usually programming c# or php...

I know that analogWrite generates a PWM signal.

I believe atmega executes one line of code at a time.

I am trying to understand if there would be any lag with the PWM signal if my application has a lot to execute or does the analogWrite run in the background?

The PWM runs in the background, you only need to send commands to change it.

There is more to a microcontroller than just the CPU “core”. The die is packed with peripherals. Two of those peripherals are a timer, and an “output compare” peripheral.

The PWM programs those two peripherals, so the timer “ticks” at a given rate (counts up an internal counter), and the output compare watches that counter and either turns its associated output on or off depending on that counter value.

Once the CPU core has configured those peripherals they just run by themselves.

It’s a bit like driving a car. Once you have turned the ignition and the engine is running you don’t need to keep turning the ignition to keep the engine running - it just runs by itself until told to stop (or it runs out of petrol).

Thanks for the feedback... That makes a lot of sense