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The operation code field of an instruction is a group of bits that define various processor operations, such as add, subtract, complement and shift. Address fields There are mainly four types of instruction formats: • Three address instructions • Two address instructions • One address instructions • Zero address instructions.
Instruction Format The commonly used format of an instruction in assembly language is given below: Memory address Machine Codes Labels Mnemonics Operands Comments Memory Address This is the address of the memory location in which a program or a Operands Operands depend on the type of instruction.
Data transfer operations can further be classified into five different types. They are: (a) Transfer of data between registers: example is the instruction MOV B,C which copies data from register C into register B. (b) Placing of specific data byte into a register or a memory location: example is the instruction MVI B, 67H (or MVI M,
One-Byte Instructions Two-Byte Instructions Three-Byte Instructions Symbols and Abbreviations Table : Symbol and abbreviations of 8085.
10 Feb 2015 The various ways of specifying data (or operands) for instructions are called as addressing modes. The 8085 Depending upon the size of machine codes, the 8085 instructions are classified into three types. DATA FORMATS: The 8085 is an 8-bit microprocessor which process only on binary numbers.
All instruction of 8085are 1 to 3 bytes in length .the bit pattern of the first cycle is the op code. The bit pattern The method of identifying the operands position by the instruction format is known as the addressing mode. Whenever two In the type of addressing mode, the operand is available directly in the instruction itself.
16 Mar 2011 Task Op. code. 1 BYTE. Copy the contents of the accumulator in the register C. MOV C,A. 2 BYTE. Load an 8-bit data byte in the accumulator. MVI A,data. 3 BYTE. Transfer the. program. sequence to. the memory. location. 2085H. JMP 2085H
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3 Jan 2017 Instruction Format. An instruction is a command to the microprocessor to perform a given task on a specified data. Each instruction has two parts: one is The operand (or data) can be specified in various ways. The 8085 instruction set is classified into the following three groups according to word size:.
NPTEL provides E-learning through online Web and Video courses various streams. Instruction formats of 8086 : The instruction format of 8086 has one or more number of fields associated with it. The first filled is called operation code field or opcode field, which indicates the type of operation. The instruction format also

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February 2018