Sibling posted a good example. But I know of (without details) things where you have to insert nops to keep peak power down, so the system doesn't brown out (in my experience, the 68hc11 won't take conditional branches if the power supply voltage dips too far; but I didn't work around that, I just made sure to use fresh batteries when my code started acting up). Especially during early boot.

Apple got in a lot of trouble for reducing peak power without telling people, to avoid overloading dying batteries.