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What is a stack pointer in 8085?

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What is a stack pointer in 8085?

For 8085: Stack pointer is a special purpose 16-bit register in the Microprocessor, which holds the address of the top of the stack. The stack pointer register in a computer is made available for general purpose use by programs executing at lower privilege levels than interrupt handlers.

What is the difference between program counter and data pointer?

Data pointer is the user accessible 2 bytes register. It is used to point to data. Program counter is used to store the address of current program that is goint to execute.

What is the difference between stack pointer and base pointer?

in two words: stack pointer allow push/pop operations to work (so push and pop knows where to put/get data). base pointer allows code to independently reference data that have been pushed previously on the stack.

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What is program counter in 8085 microprocessor?

PC contains that very memory address from where the next instruction is to be fetched for execution. Suppose the PC contents are 8000H, then it means that the 8085 Desires to fetch the instruction Byte at 8000H.

What is program counter microprocessor?

The program counter (PC) is a register that manages the memory address of the instruction to be executed next.

What is stack pointer in microprocessor?

A stack pointer is a small register that stores the address of the last program request in a stack. When a new data item is entered or “pushed” onto the top of a stack, the stack pointer increments to the next physical memory address, and the new item is copied to that address.

What is the difference between stack and stack pointer?

The stack is a LIFO (last in, first out) data structure implemented in the RAM area and is used to store addresses and data when the microprocessor branches to a subroutine. The Stack Pointer register will hold the address of the top location of the stack. …

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What is the stack pointer used for?

A stack pointer is a small register that stores the address of the last program request in a stack. A stack is a specialized buffer which stores data from the top down. As new requests come in, they “push down” the older ones.

What is program counter stack pointer?

The main difference between stack pointer and program counter is that the stack pointer is a register that stores the address of the last program request in a stack while the program counter is a register that stores the address of the next instruction to be executed from the memory.

What is the function of stack pointer and program counter?

They are the stack pointer, SP, and the program counter, PC. The Stack Pointer register will hold the address of the top location of the stack. And the program counter is a register always it will hold the address of the memory location from where the next instruction for execution will have to be fetched.

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Why are program counter and stack pointer 16 bit registers?

Thus these registers are used to store the memory locations where the Program Counter and Stack pointers point to and as we discussed earlier address of a memory location is of 16 bit, so therefore these registers are of 16 bit so that they can store the 16 bit address as data in these registers.

What is program counter stack?

The program counter is you driving the car to the grocery store and making decisions as to which way to turn or go straight. The stack is the list of items you will buy when you get there.

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