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 more

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 more

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 more

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 more

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 more

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 more

Rd = Destination register Rs = Source register 1. MOV   Rd , Rs Rd & Rs ⇒ A, B, C, D, E, H, L, and M Instruction word size  ⇒   1 Byte Operation ⇒ When this instruction will execute the content of source register (Rs) will pass in the destination register (Rd). [Rd ] ← [Rs ] Addressing Mode ⇒ Register Addressing Mode For … Read more

An interrupt is a signal to the processor, generated by hardware or software indicating an immediate attention needed by an event. In this article, we will learn about hardware interrupts. In 8085 microprocessor, there is 5 hardware interrupts. S.No. Name of Interrupt Priority Vector address Masking type Types of trigger 1 TRAP Highest (1) 0024 … Read more

An interrupt is a signal that alerts the processor to an urgent condition, either originating from hardware or triggered by software, necessitating immediate attention. This mechanism allows the processor to temporarily halt its current operations and address the event requiring attention. In this article, we will focus on software interrupts. The 8085 microprocessor has eight … Read more