What timers does the digitalwritefast library use?

Hi, I read that in order to reduce power, I can disable timer 1 and 2, since I'm not using analog write in my code. I wanted to make sure this wouldn't mess with the digitalwritefast functions.

EDIT: I'm using Arduino Uno.

The most sure way to find out is to look at the source code.

I read that in order to reduce power, I can disable timer 1 and 2, since I'm not using analog write in my code. I wanted to make sure this wouldn't mess with the digitalwritefast functions.

That library doesn't use any timer. But even if it would that was no problem as to turn the timers off (to save power) you have to put the device into sleep and in sleep mode you cannot switch any output pins.