Digital Electronics - Microprocessor Fundamentals - Discussion

Program counter is a 16 bit register that stores the address of the nxt instruction to be executed.

Hello! guys can any one tell me,

How many registers in 3 line of address bus?

Program counter is used to hold the address of the next instruction to be executed where as a stack pointer is used to hold the address of the top of the stack for a program.

Instruction pointer (IP).

Intel's term for the register that points to the next instruction to fetch. Actually, at Intel it is properly the pair CS:IP, code segment and instruction pointer, but since Intel's 8086 and 80286 era segments are deprecated the term IP by itself will often be used.

Program counter (PC).

Another popular term for the register that points to the next instruction to fetch.

The meaning of both IP and PC is extended beyond that register to the address, the contents of the register. E.g. we may say "the instruction has IP=...."

Up until the late 1990s I would estimate that the term PC was more common than the term IP for essentially the same concept. But with the dominance of Intel in the 1990s and 2000s, the term IP may have become more common.

Program counter is denoted by PC.

It is 16 bit reg.

It hold memory adderssof next instruction to be executed.

In 8085 PC stores address of next operation to be performed.

Program counter is 16 bit which stores the address of next instruction.

In 8086 its instruction pointer!

Program counter is one which tells about the next instruction.