Stop Clock

[Nevadaref]

Here's the exact rule:

NFHS 2004-05 Soccer Rules Book
Rule 7 Duration of the Game and Length of Periods
Section 4 TIME-OUT AND IN
Art. 1 . . . The clock shall be stopped for a penalty kick, for cautioning (yellow card), for disqualifications (red card, yellow/red card), following the scoring of a goal and when a referee orders time-out.
Art. 2 . . . The clock shall be restarted when the ball is properly put into play.