A
direct address instruction needs two references
to memory: (1) Read instruction, (2) Read Operand. An indirect address instruction needs three references to memory: (1) Read instruction, (2) Read effective address, (3) Read operand.
How many references to memory are needed for an indirect addressing mode instruction to bring an operand into the processor register?
An indirect address instruction needs
three references
to memory: (1) Read instruction, (2) Read effective address, (3) Read operand.
How many memory reference are required?
2 Answers. Total
3 memory references
.
What are immediate direct and indirect address instructions?
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 different memory reference instructions?
Memory Reference – These instructions refer to
memory address as an operand
. The other operand is always accumulator. Specifies 12-bit address, 3-bit opcode (other than 111) and 1-bit addressing mode for direct and indirect addressing.
What is main memory reference?
memory reference instruction
An instruction that has one or more of its operand addresses referring to a location in memory
, as opposed to one of the CPU registers or some other way of specifying an operand.
What is the difference between a direct and indirect address instructions?
Direct addressing provides the full address of the main memory
in the instruction, where the is stored. On the other hand, in indirect addressing mode, the address is stored at the address field of the instruction.
What is the immediate addressing mode?
In immediate addressing mode, the
operand is a part of the instruction
. … There is no address field as the operand is a part of the instruction. It requires one reference to memory. It does not require any reference to memory.
What are the different types of instructions?
- Arithmetic Instructions.
- Branch Instructions.
- Data Transfer Instructions.
- Logic Instructions.
- Bit-oriented Instructions.
What is memory hierarchy explain with diagram?
The memory hierarchy design in a computer system mainly includes different storage devices. Most of the computers were inbuilt with extra storage to run more powerfully beyond the main memory capacity. The following memory hierarchy diagram is
a hierarchical pyramid for computer memory
.
What are the types of instruction format?
- Operation field specifies the operation to be performed like addition.
- Address field which contains the location of the operand, i.e., register or memory location.
- Mode field which specifies how operand is to be founded.
What are the different types of main memory?
Computer memory is of two basic types – Primary memory(
RAM and ROM
) and Secondary memory (hard drive, CD, etc). Random Access Memory (RAM) is primary-volatile memory and Read Only Memory (ROM) is primary-non-volatile memory. It is also called read-write memory or the main memory or the primary memory.
What is difference between primary and secondary memory?
Primary memory is directly accessible by Processor/CPU.
Secondary memory is not directly accessible
by the CPU. … The memory devices used for primary memory are semiconductor memories. The secondary memory devices are magnetic and optical memories.
What is Ram in memory?
RAM stands for
random-access memory
, but what does that mean? Your computer RAM is essentially short term memory where data is stored as the processor needs it. … RAM can slow down your computer if there isn’t enough of it for the processor to perform the tasks you ask it to.
What is direct addressing mode with example?
Direct addressing is a scheme in which the address specifies which memory word or register contains the operand. For example: 1)
LOAD R1, 100 Load the content of memory address 100 to register R1.
2) LOAD R1, R2 Load the content of register R2 to register R1.
