Found 475 Articles for 8085

Instruction Type LXI rp, d16 in 8085 Microprocessor

Samual Sam
Updated on 30-Jul-2019 22:30:23

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In the 8085 Instruction set there are four instructions, which belong to the type LXI rp, d16. These instructions are used to load the 16-bit address into the register pair. We can use this instruction to load data from memory location using the memory address, which is stored in the register pair rp. For an example, if the instruction is LXI H, FE50. It means that the FE50 is loaded into the HL register pair. The rp can be BC, DE, HL or SP. The LXI instructions and their Hex-codes are as follows. Mnemonics, Operand Opcode (in HEX) ... Read More

Instruction type MOV M, r in 8085 Microprocessor

karthikeya Boyini
Updated on 30-Jul-2019 22:30:23

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In 8085 Instruction set, this instruction MOV M, r will copy 8-bit value from the register r to the memory location as pointed by HL register pair.This instruction uses register addressing for specifying the data. As “r” can have any one of the seven values − r = A, B, C, D, E, H, or L Thus there are seven opcodes for this type of instruction. It occupies only 1-Byte in memory. Mnemonics, Operand Opcode(in HEX) Bytes MOV M, A 77 1 MOV M, B 70 1 MOV M, C ... Read More

Instruction type MOV r, M in 8085 Microprocessor

Samual Sam
Updated on 30-Jul-2019 22:30:23

9K+ Views

In 8085 Instruction set, MOV r, M is an instruction where the 8-bit data content of the memory location as pointed by HL register pair will be moved to the register r. Thus this is an instruction to load register r with the 8-bit value from a specified memory location whose 16-bit address is in HL register pair. As r can have any of the seven values, there are seven opcodes for this type of instruction. r = A, B, C, D, E, H, or L Mnemonics, Operand Opcode Bytes MOV A, M ... Read More

Instruction type MOV r1, r2 in 8085 Microprocessor

karthikeya Boyini
Updated on 30-Jul-2019 22:30:23

9K+ Views

In 8085 Instruction set, MOV is a mnemonic, which stands for “MOVe”. In this instruction 8-bit data value in register r2 will be moved to the 8-bit register r1. Note that in 8085 instructions, as the first operand specifies the destination, and the second one the source, so here also r1 is destination register and r2 is the source register. This instruction uses register addressing for specifying the data. Here, “r1” and “r2”can be any one of the following registers. r1, r2 = A, B, C, D, E, H, or L As r1 can have any one of ... Read More

Instruction type MVI r, d8 in 8085 Microprocessor

Samual Sam
Updated on 30-Jul-2019 22:30:23

9K+ Views

MVI is a mnemonic, which actually means “Move Immediate”. With this instruction, we can load a register with an 8-bitsor 1-Bytevalue. This instruction supports immediate addressing mode for specifying the data in the instruction. In the instruction “d8” stands for any 8-bit data, and ‘r’ stands for any one of the registers e.g. A, B, C, D, E, H or L. So this r can replace any one of the seven registers. As ‘r’ can have any of the seven register names, so there are seven opcodes for this type of instruction. It occupies 2-Bytes in the memory. ... Read More

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