What is addressing mode with example?
The addressing mode specifies a rule for interpreting or modifying the address field of the instruction before the operand is actually executed. The 8086 memory addressing modes provide flexible access to memory, allowing you to easily access variables, arrays, records, pointers, and other complex data types.
What are the addressing mode of 8085?
The way of specifying data to be operated by an instruction is called addressing mode. In immediate addressing mode the source operand is always data. If the data is 8-bit, then the instruction will be of 2 bytes, if the data is of 16-bit then the instruction will be of 3 bytes.
What does Xchg command do?
The XCHG (exchange) instruction exchanges the contents of a register with the contents of any other register or memory location. The XCHG instruction cannot exchange segment registers or memory-to-memory data. There are several load-effective address instructions in the microprocessor instruction set.
What is Jnz example?
The JNZ instruction transfers control to the specified address if the value in the accumulator is not 0. If the accumulator has a value of 0, the next instruction is executed….JNZ offset.
| Bytes | 2 |
|---|---|
| Operation | JNZ PC = PC + 2 IF A <> 0 PC = PC + offset |
| Example | JNZ LABEL |
What is the correct way to use Jnz instruction?
Description
- The jnz (or jne) instruction is a conditional jump that follows a test.
- It jumps to the specified location if the Zero Flag (ZF) is cleared (0).
- jnz is commonly used to explicitly test for something not being equal to zero whereas jne is commonly found after a cmp instruction.
What does Lea do in 8086?
LEA − Used to load the address of operand into the provided register. LES − Used to load ES register and other provided register from the memory.
What is the function of MOV A 21h?
INT 21H functions
| Function number | Description |
|---|---|
| 01h e.g. mov ah,01h int 21h | Keyboard input with echo: This operation accepts a character from the keyboard buffer. If none is present, waits for keyboard entry. It returns the character in AL. |
Why it is needed to use the 8086 addressing mode?
The way of specifying data to be operated by an instruction is known as addressing modes. This specifies that the given data is an immediate data or an address. It also specifies whether the given operand is register or register pair. Note that to initialize the value of segment register an register is required.
What are 12 addressing modes of 8086?
Microprocessor – 8086 Addressing Modes
- Immediate addressing mode.
- Register addressing mode.
- Direct addressing mode.
- Register indirect addressing mode.
- Based addressing mode.
- Indexed addressing mode.
- Based-index addressing mode.
- Based indexed with displacement mode.