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The stack register contains the address of the last item pushed on the stack. The stack is a region of memory used for temporary storage of instruction addresses and register values in a Last-In-First-Out (nested) structure. It is used for interrupts and subroutine calls.
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What is stack in microprocessor?
The stack is a region of memory set aside to store register values and operands.
What is the difference between register stacks and memory stacks?
Registers are normally memory spaces internal to the processor or very close to it. They are generally faster than main memory and will be small in size and will hold very frequently used data.Register stacks are a set of such register memory locations.Memory refers to computers main memory outside CPU. It is used to keep data and programs. Memory stack is a series of memory locations.The difference between register stack and memory stack is...
Why stack data starts from one location less then stack pointer's register address?
Actually, stack data starts one location greater than the stack pointer. In the Intel design, the stack pointer always points to the next location to be used on a push, and pushes always decrement the pointer. It is more correct to say that the stack region to be used next is one location less than the stack pointer's register address.
What are the different types of segment register?
The code segment (CS) register is used for access to program code. The data segment (DS) register is used for access to data. The extra segment (ES) register is used for access to data during certain string primitive operations. The stack segment (SS) register is used for access to stack data.Any of these implied uses can be overridden with a segment override prefix opcode.
What is Difference between index register and stack pointer?
An index register contains an address that can be used during effective address generation, often along with an offset in the instruction or in another register. This is most useful when accessing elements of arrays or structures. A stack pointer is a specialized index register that points to a region of memory that can store temporary elements, in a last-in-first-out structure, such as return addresses, parameters, and local storage for function calls.
Which register in the 8085 processor is special purpose?
stack register is a special purpose register.
What is Usage of stack register?
The stack register points to the top of the stack for the currently executing thread. The stack is a fixed-length memory allocation at the bottom of addressable memory (highest available address). The stack extends upwards into lower addresses. To keep track of the stack's usage, the stack pointer marks the top of the stack where a new frame will be pushed, decrementing the stack pointer by the required amount. When a frame is popped, the stack pointer is incremented by the frame length. The stack is typically used to call and return from functions by storing the return address of the caller, but can also be used to store a function's arguments (the values passed to it by its caller), its local variables and its exception handlers. Since the memory is allocated as soon as the thread becomes active, moving a pointer to activate and release stack frames is much quicker than requesting heap memory via the operating system.
Size of stack memory and stack pointer register in 8051 microprocessor?
8 bit
When should the register modifier be used?
When your variable is going to use quite often then we can request compiler to store the variable in CPU Register, but CPU registers are limited so some time your request may not be granted, so in this case it will be stored in Stack. Don't request compiler to store large structure in CPU registers, because they are limited.
Which register can be changed directly using pop instruction in 8086?
stack segment register
Where do register variables get stored?
Either in registers or on the stack.
Difference between a counter and a register?
A register can hold data, and it can be used for temporary storage or, in the case of an accumulator, it can participate in arithmetic or logical operations. A counter is a special case of a register. Usually, it can only be loaded, stored, or incremented, or used for the stack or as the program counter.
