Contents
What is Xchg?
In 8085 Instruction set, there is one mnemonic XCHG, which stands for eXCHanGe. This is an instruction to exchange contents of HL register pair with DE register pair. This instruction uses implied addressing mode. As it is1-Byte instruction, so It occupies only 1-Byte in the memory.
What is the use of Xchg instruction in 8086?
The XCHG instruction exchanges the content of a register with the content of another register or with the content of memory location(s). It cannot directly exchange the content of two memory locations. The source and destination must both be of the same type (bytes or words).
How does Xchg instruction Work Can you you use Xchg instruction with 64 bit data?
xchg only stores one element, and it can’t magically look back in time to know where the value in eax came from and swap two memory locations with one xchg instruction. The only way to swap 1,2 to 2,1 in one instruction would be a 64-bit rotate, like rol qword ptr [arrayD], 32 (x86-64 only).
Which instruction swap the contents of two operands?
XCHG (Exchange) swaps the contents of two operands. This instruction takes the place of three MOV instructions.
Which register of 8085 is 16-bit?
Stack Pointer
Stack Pointer: The stack pointer in the 8085 microprocessor is a 16-bit register that stores the address of the top of stack memory.
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.
Which instruction is used to exchange value?
The XCHG (exchange data) instruction exchanges the contents of two operands.
Why is 8085 better than 8086?
There are some advantages of 8086 over 8085 e.g. more memory, faster clock speeds, backward compatibility, sort of better math etc. some of them are as follows: 8086 is 16 bit microprocessor whereas 8085 is 8 bit microprocessor. 8086 has 20 bit address bus while 8085 has 16 bit address buss.
What is the use of Hlda signals?
HLDA (HOLD Acknowledge) − It indicates that the CPU has received the HOLD request and it will relinquish the bus in the next clock cycle. HLDA is set to low after the HOLD signal is removed.
What does XCHG stand for in assembly program?
As we know the programs work only with the instructions in the instruction set. Instruction XCHG is used to EXCHANGE memory variables in the following permutations above. REG stands for Registers (Eg. AX, BX, CX, DX ). memory stands for Variable or Address.
What is the difference between Reg and XCHG?
Instruction XCHG is used to EXCHANGE memory variables in the following permutations above. REG stands for Registers (Eg. AX, BX, CX, DX ). memory stands for Variable or Address. immediate stands for Numbers or Values.
What are the variants of the xchg instruction?
The XCHG (exchange data) instruction exchanges the contents of two operands. There are three variants: XCHG reg, reg XCHG reg, mem XCHG mem, reg.
How to exchange two variables in XCHG program?
Other Segments are not needed to be initialized, Only assuming is enhalf. The above two line code is used to move the two variables i.e. NUM1 and NUM2 to AL and BL registers respectively. The above two line code is used to Exchange NUM2 variable to AL registers and to Exchange NUM1 variable to BL registers respectively.