What is Xlat in assembly language?
What is Xlat in assembly language?
Look-Up Translation Table (xlat)
What is Xlat microprocessor?
XLAT − Used to translate a byte in AL using a table in the memory.
What are the different types of instructions in 8086 microprocessor?
Arithmetic Instructions
| Instruction | Description |
|---|---|
| SUB | Subtract immediate data from accumulator, memory or register. |
| SBB | Subtract immediate data with borrow from accumulator, memory or register. |
| MUL | Unsigned 8-bit or 16-bit multiplication. |
| IMUL | Signed 8-bit or 16-bit multiplication. |
Which registers are used to refer the lookup table data when Xlat instruction is executed?
The XLAT and XLATB instructions get the base address of the table in memory from either the DS:EBX or the DS:BX registers (depending on the address-size attribute of the instruction, 32 or 16, respectively). (The DS segment may be overridden with a segment override prefix.)
How does Xchg work?
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. After execution of this instruction, the content between H and D registers and L and E registers will get swapped respectively.
What is test instruction in assembly language?
From Wikipedia, the free encyclopedia. In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF , ZF , PF are modified while the result of the AND is discarded. The OF and CF flags are set to 0 , while AF flag is undefined.
What is a microprocessor and what does it do?
Microprocessor, any of a type of miniature electronic device that contains the arithmetic, logic, and control circuitry necessary to perform the functions of a digital computer’s central processing unit. The production of inexpensive microprocessors enabled computer engineers to develop microcomputers.
What is minimum and maximum mode in 8086 microprocessor?
In minimum mode there can be only one processor i.e. 8086. In maximum mode there can be multiple processors with 8086, like 8087 and 8089. ALE for the latch is given by 8086 as it is the only processor in the circuit. ALE for the latch is given by 8288 bus controller as there can be multiple processors in the circuit.
How many types of the procedure calls are in 8086 microprocessor?
two types
There are two types of calls. 1)Near Call or Intra segment call. 2) Far call or Inter Segment call Operation for Near Call : When 8086 executes a near CALL instruction, it decrements the stack pointer by 2 and copies the IP register contents on to the stack.
What is the use of Xchg instruction in your program?
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 will be the contents of register Bl after the last instruction execution?
Discussion Forum
| Que. | The contents of Register (BL) and Register (AL) of 8085 microprocessor are 49H and 3AH respectively. The contents of AL, the status of carry flag (CF) and sign flag (SF) after executing ‘SUB AL, BL’ assembly language instruction, are |
|---|---|
| b. | AL=F0H; CF=0; SF=0 |
| c. | AL=F1H; CF=1; SF=1 |
| d. | AL=1FH; CF=1; SF=1 |
What is purpose of Xchg instruction?
What does the Xlat instruction do in 8086?
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. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.
Where do the Xlat and xlatb instructions get the base address?
The XLAT and XLATB instructions get the base address of the table in memory from either the DS:EBX or the DS:BX registers (depending on the address-size attribute of the instruction, 32 or 16, respectively). (The DS segment may be overridden with a segment override prefix.)
How does Xlat find byte entries in a table?
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. Thanks for contributing an answer to Stack Overflow!
When to use xlatb or BX for implicit operands?
The Intel manual suggests that xlatb is the right mnemonic when used with implicit operands, or xlat byte ptr [bx] for the explicit form (where, like movs, the operand is basically just documentation or segment overrides, and implies the operand size.) Another idea is to see what syntax your disassembler uses for the instruction.