What is the meaning of addressing mode?

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In summary, addressing mode determines how the computer accesses data, and it is important in understanding the following statements. BYTE_VALUE and WORD_VALUE define a byte and word value, respectively. The command ADD adds an immediate operand of 65 to BYTE_VALUE. The command MOV sets the value of AX to 45h, which is a hexadecimal value equal to 69. This is because computers use base 16, making it easier to work with bits. The last two commands are identical, as far as the computer is concerned.
  • #1
shantanu135
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what is addressing mode? and what is the meaning of these following statements
BYTE_VALUE DB 150; A byte value is defined
WORD_VALUE DW 300; A word value is defined
ADD BYTE_VALUE,65;An immediate operand 65is added
MOV AX,45H
what is 45h?
 
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  • #2
It's not an address, it's just a hexidecimal value. We use base 16 in computers a lot because it makes thinking about numbers in terms of bits easier. 45h = 69

These commands are exactly identical as far as the computer is concerned.
MOV AX, 45H
MOV AX, 69
 
  • #3
newjerseyrunner said:
It's not an address, it's just a hexidecimal value. We use base 16 in computers a lot because it makes thinking about numbers in terms of bits easier. 45h = 69

These commands are exactly identical as far as the computer is concerned.
MOV AX, 45H
MOV AX, 69
 
  • #4
thanks man
 

FAQ: What is the meaning of addressing mode?

1. What is an addressing mode?

An addressing mode is a technique used in computer architecture to specify the location of data in memory. This allows the processor to access and manipulate data stored in memory during program execution.

2. How does addressing mode work?

Addressing mode works by providing the processor with a specific way to interpret the address of data in memory. This can include using a direct address, an offset from a base address, or an index register to access data.

3. What are the different types of addressing modes?

There are several types of addressing modes, including direct addressing, indirect addressing, immediate addressing, relative addressing, and indexed addressing. Each type has its own way of specifying the location of data in memory.

4. Why is addressing mode important?

Addressing mode is important because it allows the processor to access and manipulate data in memory efficiently. By using different addressing modes, the processor can access data in a variety of ways, depending on the needs of the program.

5. How does addressing mode impact program performance?

The choice of addressing mode can have a significant impact on program performance. Some addressing modes may be more efficient for certain operations, while others may require more processing time. It is important for programmers to choose the appropriate addressing mode to optimize program performance.

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