The process begins with the fetch stage, where the CPU uses the address stored in the program counter to retrieve the next instruction from main memory. It then loads a new address from a table of interrupt vectors, directing execution to the appropriate handler.
How the Program Counter Updates to the Subsequent Location
This cycle repeats at staggering speeds, and the program counter is the lynchpin that guarantees continuity. Once the instruction is fetched, the counter is updated to point to the subsequent location.
Defining the Program Counter The program counter, often abbreviated as PC, is a specific CPU register that holds the memory address of the next instruction the processor is scheduled to execute. When an urgent event occurs—a key press, a timer signal, or a division-by-zero error—the processor must pause its current task.
How the Program Counter Updates to the Subsequent Location
This specialized register serves as the navigator of the central processing unit, constantly tracking the location of the next instruction that needs to be executed. To manage this, the processor pushes the current value of the program counter—the address of the instruction immediately following the call—onto the stack.
More About What does the program counter do
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More perspective on What does the program counter do can make the topic easier to follow by connecting earlier points with a few simple takeaways.
