What are data copy transfer instructions?
Data copy/ Transfer Instruction
- 1) MOV- Move. Transfers data from 1 register/memory to another register/memory.
- 2) PUSH: Push to stack.
- 3) POP: Pop from stack.
- 4) XCHG: Exchange.
- 5) IN: input code.
- 6) OUT: Output to the port.
- 7) XLAT: Translate.
- 8) LEA instruction (load effective balance)
Which instruction of 8086 can be used for look up table manipulations?
Replaces the byte in AL with byte from a user table addressed by BX. Before the XLAT instruction can be executed, the lookup table containing the values for the new code must be put in memory, and the offset of the starting address of the lookup table must be loaded in BX.
What is data transfer instructions in microprocessor?
Data transfer instructions are the instructions which transfers data in the microprocessor. They are also called copy instructions.
What is Xchg instruction?
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 does AAD instruction indicates in 8086 microprocessor?
The AAD instruction sets the value in the AL register to (AL + (10 * AH)), and then clears the AH register to 00H.
What is Xlat Assembly?
XLAT Locates a byte entry in a table in memory, using the contents of the AL register as a table index, then copies the contents of the table entry back into the AL register.
What is the format of Xlat?
XLAT changes the AL register from the table index to the table entry. AL should be the unsigned index into a table addressed by DS:BX (for an address-size attribute of 16 bits) or DS:EBX (for an address-size attribute of 32 bits). The operand to XLAT allows for the possibility of a segment override.
What is instruction set of microprocessor?
An instruction of a computer is a command given to the computer to perform a specified operation on given data. In microprocessor, the instruction set is the collection of the instructions that the microprocessor is designed to execute.
What is data transfer instructions with example?
This instruction simply copies the data from the source to the destination. Syntax: MOV destination , source Example: MOV AX, BX. 2) PUSH. This instruction is used to push data into the stack. Syntax: PUSH source Example: PUSH CX Working: SP <- SP – 1 [SP] <- CH SP <- SP – 1 [SP] <- CL.
What is Xlat instruction in microcontroller?
The AL register has a byte number. The XLAT instruction takes the byte number from AL and load the contents of address DS: BX+AL into AL register. The syntax for this instruction is:
What is xlatb in microprocessor?
The no-operands form (XLATB) provides a “short form” of the XLAT instructions. Here also the processor assumes that the DS: (E)BX registers contain the base address of the table. In 64-bit mode, operation is similar to that in legacy or compatibility mode.
How to use Xlat instruction in AL register?
The AL register has a byte number. The XLAT instruction takes the byte number from AL and load the contents of address DS: BX+AL into AL register. The syntax for this instruction is: First, you’ll have to store the starting offset address of table into BX register which is done by:
What is the difference between BX+al and Xlat?
The BX register contains the offset address of the lookup table. The AL register has a byte number. The XLAT instruction takes the byte number from AL and load the contents of address DS: BX+AL into AL register. The syntax for this instruction is: