MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -Each assembly language statement is split into an opcode and an operand . The opcode is the instruction that is executed by the CPU and the operand is the data or memory location used to execute that instruction.

Detailed explanation-2: -A program written in assembly language consists of a series of mnemonic processor instructions and meta-statements (known variously as declarative operations, directives, pseudo-instructions, pseudo-operations and pseudo-ops), comments and data.

Detailed explanation-3: -Syntax of Assembly Language Statements A basic instruction has two parts, the first one is the name of the instruction (or the mnemonic), which is to be executed, and the second are the operands or the parameters of the command.

Detailed explanation-4: -Each source statement may include up to four fields: a label, an operation (instruction mnemonic or assembler directive), an operand, and a comment. The following are examples of an assembly directive and a regular machine instruction.