Most complex digital circuits are sequential, where the logic is performed in discrete steps (such as a computer). A timing pulse signal (called a clock) is used to control the operational steps and keep all the circuitry in proper sequence. (An example of a common clocked circuit element is a flip-flip.) This clock is a digital pulse train and normally operates at a constant high frequency, limited only by the operational speed and propagation delay of the various circuit paths. The clock has to allow enough time for all the circuits to settle to their new state before the next clock arrives.what is clock ? why it is necessery ? how to generate it?
sir could you please tell me practical example for this?Most complex digital circuits are sequential, where the logic is performed in discrete steps (such as a computer). A timing pulse signal (called a clock) is used to control the operational steps and keep all the circuitry in proper sequence. (An example of a common clocked circuit element is a flip-flip.) This clock is a digital pulse train and normally operates at a constant high frequency, limited only by the operational speed and propagation delay of the various circuit paths. The clock has to allow enough time for all the circuits to settle to their new state before the next clock arrives.
The clock can be generated by a simple RC relaxation oscillator, or by crystal oscillators if the frequency is critical to maintain an accurate time sequence for the logic outputs.