The two-phase process for executing instructions on a typical CPU involves a fetch step and an execute step. Fetch is where the instruction is loaded from memory and execute is where the actions detailed in the instruction are carried out.
Every instruction before execution face there three phases
1. Fetch
2. Decode
3. Execute
Two Stage: Fetch Execute Three Stage: Fetch Decode Execute Multiple Stages: Fetch Decode Address Read Execute Write
Yes , an interrupt actually interrupt the execution of an instruction at any time during the instruction execution cycle.AS there the execution takes in 4 t cycles and t3 to take up the data and the 4th cycle for execution,if there is an interruption then there will be an interruption any time in any instruction execution cycle.
The instruction cycle is the basic operation cycle in a computer. This is what will take in data, process it and execute as required.
The instruction phase together with the execution phase is called a "Machine Cycle".
Bus cycle - clock cycles taken to complete one bus transaction. Instruction cycle - clock cycles taken to complete execution of one instruction
The processing cycle is the execution start date and the next execution start date of a jobnet.
An instruction cycle is the rudimentary operation cycle of any computer. It involves the CPU fetching a program from memory and executing it fully.
The execution cycle.
Each time the CPU executes an instruction, it takes a series of steps. The complete series of steps is called a machine cycle. A machine cycle can be divided into two smaller cycles. These are instruction cycle and execution cycle. Instruction cycle: In instruction cycle CPU takes two steps-- 1. Fetching: Before the CPU can execute an instruction, the control unit must retrieve or fetch a command or data from the computer's memory. 2. Decoding: Before a command can be executed, the control unit must decode the command into instruction set. Execution cycle: In execution cycle CPU also takes two steps-- 1. Executing: When the command is executed, the CPU carried out the instructions in order by converting them into macrocode. 2. Storing: The CPU may be required to store the result of an instruction in memory.
three
The sequence of operations that the cpu has to carry out while execution is called instruction cycle. 1:- Read an Instruction 2:- Decode the instruction 3:- Find the address of operand 4:- retrieve an operand 5:- perform desired operation 6:- find the address of destination 7:- store the result into the destination
In PIC Microcontroller , During the Fatching of instruction no. 1it needs of one clock cycle, then after for the exicution of instruction no. 1 it reqires one extra clock cycle , but at the same time it fatches inst. no. 2 . Similarly, during the execution time of inst. no. 2 , it fatches inst. no. 3 and so on.In other words we can say that, PIC Microcontroller requires 2 clock cycle at starting the after it requires only one clock pulse. In this way we can say that instruction pipelining is done in PIC microcontroller.
an instruction cycle may consist of a number of machine cycles.