Answer to Question #156886 in Assembler for nazia khan

Question

Question:

Each instruction must contain the information required by the processor for execution.

a.     Discuss the elements of this required information.

b.     Discuss the main areas to which source and result operands belong.   

Answer 1

a)     Each instruction must have elements that contain the information required by the CPU for execution:

Operation Code: Indicates the operation to be performed.

Source Operand Field: An operation can include one or more source operands.

The operand field of the result.

Next Instruction Reference: Tells the processor where to select the next instruction after the instruction completes.

 

b)     An instruction format can consist of one or more operand fields that provide the address of the data or the data itself. Each location can be memory, register, or stack. The length of the transmitted data must be specified. The instruction must specify the location of the source and result operands. For all instructions with operands, the addressing mode must be specified for each operand. The most commonly used addressing modes are immediate, direct, indirect, offset, and stack