NFL Game Clock Rules

[aschramm]

Quick question,
I've been noticing this year that in the NFL, after an offensive player goes out of bounds (forced out or by himself), that the clock stops. But once they get the ball back into the Umpire and placed, the clock starts again (Except toward the ends of each half). Has this always been done in the NFL? I think I've noticed this in NCAA games as well this year..

Thanks in advance.