Found 558 Articles for Microprocessor

In 8085 Instruction set, we are having one mnemonic JPO a16, which stands for “Jump if Parity Odd” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen if and only if the present parity flag value is 0. If parity flag value is 1, program flow continues sequentially. It is a 3-Byte instruction.Mnemonics, OperandOpcode(in HEX)BytesJPO LabelE23Let us consider one example of this instruction type JPO 4000H. It is a 3-Byte instruction. The result of execution of ... Read More

In 8085 Instruction set, we are having one mnemonic JZ a16, which stands for “Jump Zero” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen if and only if the present zero flag value is 1. If the zero flag value is 0, program flow continues sequentially. It is a 3-Byte instruction.Mnemonics, OperandOpcode(in HEX)BytesJZ LabelCA3Let us consider one example of this instruction type JZ 4000H. It is a 3-Byte instruction. The result of execution of this instruction ... Read More

In 8085 Instruction set, we are having one mnemonic JNZ a16, which stands for “Jump if Not Zero” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen if and only if the present zero flag value is 0. If zero flag value is 1, program flow continues sequentially. It is a 3-Byte instruction.Mnemonics, OperandOpcode(in HEX)BytesJNZLabelC23Let us consider one example of this instruction type JNZ 4000H. It is a 3-Byte instruction. The result of execution of this ... Read More

In 8085 Instruction set, we are having one mnemonic JC a16, which stands for “Jump if Carry” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen if and only if the present carry flag value is 1.If carry flag value is 0, program flow continues sequentially. It is a 3-Byte instruction.Mnemonics, OperandOpcode(in HEX)BytesJC LabelDA3Let us consider one example of this instruction type JC 4000H. It is a 3-Byte instruction. The result of execution of this instruction ... Read More

In 8085 Instruction set, we are having one mnemonic JNC a16, which stands for “Jump if Not Carry” and “a16”stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen if and only if the present carry flag value is 0. If carry flag value is 1, program flow continues sequentially. It is a 3-Byte instruction.Mnemonics, OperandOpcode(in HEX)BytesJNCLabelD23Let us consider one example of this instruction type JNC 4000H. It is a 3-Byte instruction. The result of execution of this instruction ... Read More

In 8085 Instruction set, there are a set of jump instructions, which can transfer program control to a certain memory location. So after these branching mnemonics, we shall have to mention 16-bit target address of the location. These jump instructions can be divided into two categories– Unconditional jump instructions andConditional jump instructionsHere we shall discuss conditional jump instructions in details. Under conditional Jump instructions, we are having 8 different mnemonics. We know that there are 5 flag bits in 8085 Flag register. They are S, Z, P, Cy, AC. Out of them only on AC flag bit, there is no jump ... Read More

In 8085 Instruction set, there are a set of jump instructions, which can transfer programcontrol to a certain memory location. So after these branchingmnemonics we shall have to mention 16-bit target address of thelocation. These jump instructions can be divided into two categories– Unconditional jump instructions andConditional jump instructionsHere in this section we shall discuss only the unconditional jump instruction. Tre required mnemonic is JUMP a16. Here in this instruction a16 denotes 16-bit memory location address.This instruction does not depend on the current conditions of theflag bits in the flag register. It is a 3-Byte instruction. The firstByte will contain the ... Read More

In 8085 Instruction set, there are a set of jump instructions, which can transfer program control to a certain memory location. So after these branching mnemonics we shall have to mention 16-bit target address of the location. These jump instructions can be divided into two categories– Unconditional jump instructions andConditional jump instructionsUnder unconditional jump instructions there is only one mnemonic i.e. JUMP. But under conditional Jump instructions we are having 8 different mnemonics. We know that there are 5 flag bits in 8085 Flag register. They are S, Z, P, Cy, AC. Out of them only on AC flag bit, there ... Read More

In 8085 Instruction set, there a set of instructions which can Accumulator contents left orright. It is to be noted here that rotate operation can be performedonly on Accumulator contents. These instructions set is listed below– Mnemonics, OperandOpcode(in HEX)BytesRAL171RAR1F1RLC071RRC0F1Mnemonic RLC stands for “Rotate Left Accumulator”. It rotates the Accumulator contents to the left by 1-bit position. The following Fig. shows the operation explicitly – In this fig. it has been depicted that the mostsignificant bit of the Accumulator will come out and left rotate willcreate an empty space at the least significant bit place and thiscome out bit will be copied at ... Read More

In 8085 Instruction set, we are having a set of instructions to perform compare operation where we shall compare two operands, and which will affect the status flags values depending on the result of the comparison. In this operation, 8085 imposes the restriction that one of the operands must be in the Accumulator. The other operand can be one of the following –ClassificationsExamplesThe other operand can be kept in 8-bit immediate data in the instruction.CPI 43HCPI FFHThe other 8-bit operand can be kept in a memory location and whose memory address will be pointed by HL register pair.CMP MThe other ... Read More