An oscillator-generated signal that provides a timing reference for a transmission link; used to control the timing of functions such as sampling interval, signaling rate, and duration of signal elements
A clock tracks the passage of time and reports the current time instant, like a real clock However, most clocks used in ESMF components have a key difference to a real clock Clocks in an ESMF component are generally stepped forward by the component, as an explicitly coded time step within the overall component
An electrical signal that synchronizes timing among digital circuits of semiconductor chips or modules
Associated with the CPU The clock generates a frequency that times the system's operations A computer that operates at 200 MHz, has a CPU clock operating at 200 million cycles per second Each instruction requires one or more clock cycles Thus the faster the clock speed, the faster the computer processes data The clock that puts the time and date on the screen is a separate clock-calendar chip
If you want to turn the clock back or put the clock back, you want to return to a situation that used to exist, usually because the present situation is unpleasant. In some ways we wish we could turn the clock back We cannot put back the clock. An embroidered or woven decoration on the side of a stocking or sock. Machine or electronic device that measures and records time. Both simple and elaborate clocks, as well as sundials, candle clocks, and sandglasses, were used for measuring time in ancient Egypt, Greece, and Rome. The first mechanical clocks were weight-driven and perhaps were invented for use in monasteries, where the disciplined life required a strict rendering of time. The first European public clock that struck the hours was erected in Milan in 1335, and the oldest surviving clocks are in England (1386) and France (1389). The first domestic clocks appeared late in the 14th century. About 1500 Peter Henlein, a German locksmith, began to make the first portable timepieces, small clocks driven by a spring. Christiaan Huygens invented pendulum clocks in 1656. Big Ben, the great clock at Westminster in London, was installed in 1859 and is the standard for all accurate tower pendulum clocks. The most accurate mechanical timekeepers (within a few thousandths of a second per day) are clocks with short pendulums (about 39 in. [or 990 mm]). In 1929 the vibration of a quartz crystal was first applied to timekeeping; the maximum error of an observatory quartz-crystal clock is only a few ten-thousandths of a second per day. The first atomic clock went into operation in 1951. Atomic clocks, regulated by the natural periodic behaviour of a system of atoms (such as vibrations or emission of radiation), can have accuracies exceeding one billionth of a second per day, making them the most accurate clocks yet invented
measure the time or duration of an event or action or the person who performs an action in a certain period of time; "he clocked the runners"
A clock is an instrument, for example in a room or on the outside of a building, that shows what time of day it is. He was conscious of a clock ticking He also repairs clocks and watches a digital clock
also known as a molecular clock One of the most important assumptions that is often made using molecular data is the existence of a clock In other words, there is sometimes an assumption being made either implicitly or explicitly that the rate of change of residues in molecules is approximately constant Making this assumption is fraught with dangers, but a great many empirical studies have shown that (with some errors) the assumption of a clock often holds true If there are some good reference points (say, fossils or significant geological events) it is sometimes possible to use molecular data to estimate the time of events for which there is no other alternative
The original 645 shipped with a separate box that was a microsecond realtime clock with the ability to interrupt any CPU On the 6180, the clock moved into the SCU and didn't take up a port See SCAS The calendar clock value read by the rccl instruction is 52 bits (right-justified in the 72-bit AQ register) Story: "Multics Calendar Clock Calculations"
A time clock in a factory or office is a device that is used to record the hours that people work. Each worker puts a special card into the device when they arrive and leave, and the times are recorded on the card. Government workers were made to punch time clocks morning, noon and night
Timing pulses used within a system or circuit to synchronize the operation of components In a power converter, these pulses are generated by the pulse width modulation (PWM) chips