What is Source Index and Destination Index in 8086?
Source Index(SI):SI is the Source Index Register. Which is used to point to memory locations in the data segment addressed by DS. By increment the contents of SI one can easily access consecutive memory locations. Destination Index(DI): DI is the Destination Index register performs the same function as SI.
What are the pointer and index registers used in 8086?
– Stack pointer and base pointer are the two pointer registers whereas the Source index and Destination index are the index group of registers. – They are primarily used to store relative to segment registers the locations of offset addresses of memory locations. They serve the purpose of being memory pointers.
What is the importance of instruction pointer in 8086?
Instruction Pointer (IP): It is a 16 bit register. It holds offset of the next instructions in the Code Segment. IP is incremented after every instruction byte is fetched. IP gets a new value whenever a branch instruction occurs.
What is the other name of instruction pointer?
The program counter (PC), commonly called the instruction pointer (IP) in Intel x86 and Itanium microprocessors, and sometimes called the instruction address register (IAR), the instruction counter, or just part of the instruction sequencer, is a processor register that indicates where a computer is in its program …
What is instruction pointer explain with example?
A register in the control unit of the CPU that is used to keep track of the address of the current or next instruction. Typically, the program counter is advanced to the next instruction, and then the current instruction is executed.
What is the working of instruction Inc?
The INC instruction adds one to the destination operand, while preserving the state of the carry flag CF: The destination operand can be a register or a memory location. This instruction allows a loop counter to be updated without disturbing the CF flag.
What is the size of instruction pointer?
The Instruction Pointer is ______ bits in length. Explanation: 8086 microprocessor is a 16-bit microprocessor and all the registers of 8086 are 16-bit registers. So, Instruction pointer is a 16 bit register.
What is the use of CX register?
CX is known as the count register, as the ECX, CX registers store the loop count in iterative operations. DX is known as the data register. It is also used in input/output operations. It is also used with AX register along with DX for multiply and divide operations involving large values.