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Clock signal and legend. In electronics and especially synchronous digital circuits, a clock signal (historically also known as logic beat) [ 1] is an electronic logic signal ( voltage or current) which oscillates between a high and a low state at a constant frequency and is used like a metronome to synchronize actions of digital circuits.
Serial Peripheral Interface ( SPI) is a de facto standard (with many variants) for synchronous serial communication, used primarily in embedded systems for short-distance wired communication between integrated circuits . SPI uses a master–slave architecture, described here with the terms "main" and "sub", [ note 2] [ 1] where one [ note 3 ...
History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...
The 24th hour on the right side of the dial is typical for the old Italian time system of 24 hours counted from dusk. Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution). The more familiar 12-hour analog dial has an hour hand that makes two complete ...
Casio F-91W digital watch, one of the most popular watches ever. A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical ...
Clock face. A wall clock showing the time at 10:09. A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands. In its most basic, globally recognized form, the periphery of the dial is numbered 1 ...
A clock ident is a form of television ident in which a clock is displayed, reading the current time, and usually alongside the logo of that particular television station. Clock idents are typically used before news bulletins and closedown, though in the past quite commonly preceded regular programming. In the United Kingdom, it is also very ...
Flip clock. A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology - the study and measurement of time and palette - and the ...
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