What is the advantage of using address mode in an instruction?
Table of Contents
- 1 What is the advantage of using address mode in an instruction?
- 2 What are the merits and demerits of single address instruction?
- 3 Why addressing modes are required in microcontroller?
- 4 What is the one address instruction?
- 5 What are the two key aspects of machine instructions influence instruction sets?
What is the advantage of using address mode in an instruction?
These can also be said as the advantages of using addressing mode: To give programming versatility to the user by providing such facilities as pointers to memory, counter for loop control, indexing of data, and program relocation. To reduce the number of bits in the addressing field of the instruction.
What are addressing modes What are its types explain each one of them with an example?
Here are the addressing modes discussed: Immediate: The operand is included in the instruction. Direct: The effective address of the operand in memory is part of the instruction. Indirect: The instruction contains a memory address, which contains the effective address of the operand in memory.
What are the merits and demerits of single address instruction?
Difference between Three-Address Instruction and One-Address Instruction:
| Three-Address Instruction | One-Address Instruction |
|---|---|
| It disadvantage i.e. three memory access is eliminated by two-address memory. | It eliminated two memory access. |
How addressing modes affect the instruction pipelining?
Degradation of performance is an instruction pipeline may be due to address dependency where operand address cannot be calculated without available informatition needed by addressing mode for e.g. An instructions with register indirect mode cannot proceed to fetch the operand if the previous instructions is loading the …
Why addressing modes are required in microcontroller?
Addressing mode is a way to address an operand. Operand means the data we are operating upon (in most cases source data). It can be a direct address of memory, it can be register names, it can be any numerical data etc. I will explain this with a simple data move instruction of 8051.
What is an effective address?
effective address An absolute address that is either a direct address or has been computed by one of the addressing schemes such as augmenting, relative addressing, or indexing.
What is the one address instruction?
2. One Address Instructions – This use a implied ACCUMULATOR register for data manipulation. One operand is in accumulator and other is in register or memory location. Implied means that the CPU already know that one operand is in accumulator so there is no need to specify it. Expression: X = (A+B)*(C+D)
What are the advantages and disadvantages of three address instructions over 2 address instructions?
The advantage of the three-address format is that it results in short programs when evaluating arithmetic expressions. The disadvantage is that the binary-coded instructions require too many bits to specify three addresses. An example of a commercial computer that uses three-address instructions is the Cyber 170.
What are the two key aspects of machine instructions influence instruction sets?
The machine instructions are influenced by addressing modes and condition code flags. I. Addressing modes: Addressing modes should provide the means for accessing a variety of data structures simply and efficiently. Useful addressing modes include index, indirect, autoincrement, and autodecrement.