Fetch
In the first step, the CPU retrieves the instruction that it needs to run from program memory. Each instruction in a program (which contains millions of instructions) is stored at a specific address. The CPU has a program counter, which keeps track of the CPU’s position in the program – more specifically, the address of the instruction that the CPU is accessing.
Decode
For this step, it’s important to know that no matter what code a program is written in, the compiler for that specific language breaks the code down to Assembly Language. Assembly language is a language that the CPU understands, but may vary between different CPUs. From there on, an “˜assembler’ translates Assembly Language into binary code, which the CPU can manipulate to execute the instructions it is given.
FetchIn the first step, the CPU retrieves the instruction that it needs to run from program memory. Each instruction in a program (which contains millions of instructions) is stored at a specific address. The CPU has a program counter, which keeps track of the CPU’s position in the program – more specifically, the address of the instruction that the CPU is accessing.DecodeFor this step, it’s important to know that no matter what code a program is written in, the compiler for that specific language breaks the code down to Assembly Language. Assembly language is a language that the CPU understands, but may vary between different CPUs. From there on, an “˜assembler’ translates Assembly Language into binary code, which the CPU can manipulate to execute the instructions it is given.
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