Microprocessor

Opcodes of 8085 Microprocessor

The 8085 microprocessor has 74 basic instructions and 246 total instructions. The instruction set of 8085 was defined by the manufacturer INTEL CORPORATION. Each 8085 instruction has a one-byte (8-bit) operation codes or opcode. With 8-bit binary opcode, a total of 256 different operation codes can be generated, each representing a certain operation. In this, … Read moreOpcodes of 8085 Microprocessor

Instruction Word Size | 8085 Microprocessor

The total memory location required to feed the instruction in memory is called as instruction word size. The memory location of 8085 microprocessor can accommodate 8-bits of data. To store 16-bits data, they are stored in two consecutive memory locations (i.e. 2 Bytes). According to the instruction word size in 8085 microprocessor, there are three types of … Read moreInstruction Word Size | 8085 Microprocessor

Addressing Modes in Instructions | 8085 Microprocessor

In this article, we will discuss addressing modes of 8085 microprocessor. To perform any operation, we have to give the corresponding instructions to the microprocessor. In each instruction, a programmer has to specify three things: 1. Operation to be performed. 2. Address of source of data. 3. Address of destination of the result. The method … Read moreAddressing Modes in Instructions | 8085 Microprocessor

8 Bit Logical Compare Instructions | 8085 Microprocessor

1. CMP  R R ⇒ A, B, C, D, E, H, L, and M Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute the content of Register R will compare with the content of accumulator (A) and the status of flag affect accordingly to the result. Note: It is nothing but SUB R instruction and … Read more8 Bit Logical Compare Instructions | 8085 Microprocessor

8 Bit Logical Rotational Instructions | 8085 Microprocessor

These instructions execute on the basis of the content of accumulator. When these instructions execute, the content of accumulator will shift by 1 bit either left or right as per the instruction. 1. RLC  no operand Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute the content of accumulator will shift (or rotate) … Read more8 Bit Logical Rotational Instructions | 8085 Microprocessor

16 Bit Arithmetic Instructions | 8085 Microprocessor

1. INR  Rp Rp ⇒ BC ≡ B DE ≡ D HL ≡ H Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute the content of Register pair Rp will increase by 1 and the final result will store in the Register pair Rp. [Rp] ← [Rp] + 1LSB Addressing Mode ⇒ Register Addressing Mode   2. DCX  … Read more16 Bit Arithmetic Instructions | 8085 Microprocessor

16 Bit Data Transfer Instructions | 8085 Microprocessor

Rp = Register pair 1. LXI   Rp, 16 Bit data Rp ⇒ BC ≡ B DE ≡ D HL ≡ H SP Instruction word size  ⇒   3 Byte Operation ⇒ When this instruction will execute the 16-bit data will store in register pair Rp. [Rp ] ← 16-bit data Addressing Mode ⇒ Immediate Addressing Mode For example: LXI  D  2059 H [D] = 20 … Read more16 Bit Data Transfer Instructions | 8085 Microprocessor

8 Bit Logical Instructions | 8085 Microprocessor

1. ANA  R R ⇒ A, B, C, D, E, H, L, and M Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute the content of Register R will get AND operation with the accumulator (A) content bit by bit and the final result will store in the accumulator [A]. Addressing Mode ⇒ If R ≠ … Read more8 Bit Logical Instructions | 8085 Microprocessor

8 Bit Arithmetic Instructions | 8085 Microprocessor

1. ADD  R R ⇒ A, B, C, D, E, H, L, and M Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute the content of Register R will get added to the accumulator (A) and the final result will store in the accumulator [A]. [A] ← [A] + [R] Addressing Mode ⇒ If R ≠ M … Read more8 Bit Arithmetic Instructions | 8085 Microprocessor

Machine Control Instructions | 8085 Microprocessor

1. NOP   no operand Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute microprocessor will not perform any task. It is used for the creation of delay. Addressing Mode ⇒ Implicit Addressing Mode   2. HLT   no operand Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute further increment of the program counter … Read moreMachine Control Instructions | 8085 Microprocessor

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