What is the relationship between CPU Cycle Signal Beat Pulse Signal?

The relationship between the instruction cycle, the CPU cycle, and the cycle time.

1. Cycle: It is time, the time to complete a task.

The instruction period is the total time it takes for the CPU to retrieve an instruction from memory and execute it. It usually consists of several machine cycles.

composition, the total time required from the time to retrieve the instruction, analyze the instruction to the completion of the execution. The number of machine cycles required varies depending on the instruction. For some simple single-byte instructions, in the instruction fetch cycle, after the instruction is taken out to the instruction register, it is immediately decoded and executed, and no other machine cycles are required.

For some more complex instructions, such as transfer instructions and multiplication instructions, two or more machine cycles are required. Instructions that usually contain one machine cycle are called single-cycle instructions, and instructions that contain two machine cycles are called two-cycle instructions.

2. CPU cycle.

Also known as machine cycles, CPU cycles are defined as the minimum amount of time it takes to read an instruction word from memory. An instruction cycle is usually composed of several CPU cycles.

3. Clock cycle.

Cycle cycle) The clock cycle, also known as the oscillation cycle, is defined as the reciprocal of the clock pulse (it can be understood that the clock cycle is a microcontroller.

External crystal oscillator. For example, the reciprocal of a 12m crystal oscillator, whose time period is 1 12 us), is the most basic and smallest unit of time in a computer.

In a clock cycle, the CPU performs only one of the most basic actions. For a certain microcontroller, if the clock frequency of 1MHz is used.

then the clock period is 1us; If a clock frequency of 4MHz is used, the clock period is 250us. Since the clock pulse is the basic working pulse of the computer, it controls the working rhythm of the computer (so that every step of the computer is unified to its pace). Obviously, for the same model of computer, the higher the clock frequency, the faster the computer will work.

However, because different computer hardware circuits and devices are not exactly the same, the required clock cycle frequency range is not necessarily the same. The clock range of the 8051 microcontroller we learned is:

In the 8051 microcontroller, one clock cycle is defined as one beat (denoted by p), and two beats are defined as a state cycle (denoted by s).

4. Clock cycle.

The clock cycle, also known as the oscillation cycle, is defined as the reciprocal of the clock pulse (the clock cycle is the reciprocal of the external crystal oscillator of the single-chip microcomputer, such as the crystal oscillator of 12m, its clock period is 1 12us), which is the most basic and smallest time unit in the computer.

In a clock cycle, the CPU performs only one of the most basic actions. The clock pulse is the basic working pulse of the computer, which controls the working rhythm of the computer. The higher the clock frequency, the faster it works.

The 8051 microcontroller defines one clock cycle as one beat (denoted by p) and two beats as a state cycle (denoted by s).

A CPU working cycle is divided into several equal time periods, and each time period corresponds to a potential signal, which is called the beat potential signal; Within a beat, one or several working pulses are often set as a form of synchronization for various pulses.