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The other person said that you should look at the Arduino Core code, while I think it's a good idea to an extent, there's a lot of code that's really specialized (looking at all the #defines) and code that's written to "protect users" (I really don't know how to word this). Go look at digitalWrite, it makes sure the pin you're using is a valid pin and it turns off any PWMs. I don't think it's even possible to write an invalid value to the output register, and you don't always have to check for a PWM if you never set up a PWM in the first place (you'd disable the peripheral function when you set the pin up as an input/output).