Instruction full detail (Instruction and Timing)

Introduction :



In this chapter, we will learn about 8085 instruction set in detail. At the end of the chapter, assembly and machine language programming is introduced.

What is an instruction?

The microprocessor can be programmed using instructions from its instruction set. An instruction may be a command to the microprocessor to perform a given operation on specified data. An instruction consists of two parts order code (opcode) which specifies what operation to be performed and data to be operated on called the operand. The 8085 microprocessor uses 8-bit code referred to as opcode to specify an instruction. The operands for an instruction can be specified in different ways known as addressing modes, which are explained later in detail.

MOV A, B is an example of 8085 instruction which moves an 8-bit value stored in register B into accumulator (register A). Here, MOV specifies the meaning of instruction that data is to be moved from one place to another place. A and B are operands where B specifies source operand and A specifies destination operand. The 8085 binary code for MOV A, B is 78h. in 78h, (0 1 1 1 1 0 0 0) upper two bits 01 is opcode and denotes move operation. The next three bits 111 is code for A denoting destination and last three bits 000 is code for B denoting source. We will learn more about this in subsequent topics.

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