Does section 654 of the California Code of Criminal Procedure apply to a single offence?

Section 654 provides: "An act or omission that is punishable in different ways by different provisions of law shall be punished under the provision that provides for the longest potential term of imprisonment, but in no case shall the act or omission be punished under more than one provision." ( 654, subd. (a).) "[I]t is well settled that section 654 applies not only where there was but one act in the ordinary sense, but also where there was a course of conduct which violated more than one statute but nevertheless constituted an indivisible transaction. [Citation.] Whether a course of conduct is indivisible depends upon the intent and objective of the actor." (People v. Perez (1979) 23 Cal.3d 545, 551 (Perez).) "A trial court's implied finding that a defendant harbored a separate intent and objective for each offense will be upheld on appeal if it is supported by substantial evidence." (People v. Blake (1998) 68 Cal.App.4th 509, 512.)