system clock

English Thesaurus

1. an electronic device in a computer that issues a steady high-frequency signal that synchronizes all the internal components (noun.artifact)

hypernym	:	electronic device,
definition	:	a device that accomplishes its purpose electronically (noun.artifact)

2. a time-of-day clock in a computer system (noun.artifact)

hypernym	:	clock,
definition	:	a timepiece that shows the time of day (noun.artifact)