The clock cycle is also called the oscillation cycle: it is defined as the reciprocal of the clock pulse (the clock cycle is the reciprocal of the crystal oscillator directly used by the internal CPU, such as a 12M crystal oscillator, its clock cycle is 1/12us), and is the most basic and smallest time unit in the computer. In one clock cycle, the CPU only completes one most basic action. The clock pulse is the basic working pulse of the computer and controls the working rhythm of the computer. The higher the clock frequency, the faster the working speed. 】
Keywords：CPU
Reference address：Differentiation of various cycles in CPU
Machine cycle: In a computer, the execution process of an instruction is often divided into several stages, and each stage completes a task. Each task is called a basic operation, and the time required to complete a basic operation is called a machine cycle. A machine cycle of the 8051 series microcontroller consists of 6 S cycles (state cycles). One S cycle = 2 clock cycles, so one machine cycle of the 8051 microcontroller = 6 state cycles = 12 clock cycles.
Instruction cycle: The time required to execute an instruction, generally composed of several machine cycles. Different instructions require different machine cycles.
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