Found 475 Articles for 8085

In 8085 Instruction set, DCX is a mnemonic that stands for “DeCrementeXtended register” and rp stands for register pair. And it can be any one of the following register pairs − rp = BC, DE, or HL This instruction will be used to subtract 1 from the present content of the rp. And thus the result of the decremented content will remain stored in rp itself. Though, it is an arithmetic instruction, note that flags are not at all affected by the execution of this instruction. A register pair is generally used to store 16-bit memory address. If ... Read More

In 8085 Instruction set, INX is a mnemonic that stands for “INcrementeXtended register” and rp stands for register pair. And it can be any one of the following register pairs. rp = BC, DE, or HL This instruction will be used to add 1 to the present content of the rp. And thus the result of the incremented content will remain stored in rp itself. Though it is an arithmetic instruction, note that, flag bits are not at all affected by the execution of this instruction. A register pair is generally used to store 16-bit memory address. If ... Read More

In 8085 Instruction set, SBI is a mnemonic that stands for “Subtract with Borrow Immediate from Accumulator” and here d8 stands for any 8-bit data as operand. This instruction is used to subtract 8-bit immediate data from the Accumulator along with the carry (borrow) value. The result of subtraction will be stored in the Accumulator. As this is an arithmetic instruction, so the flags are affected based on the result produced. It occupies 2 consecutive Bytes in memory. Mnemonics, Operand Opcode(in HEX) Bytes SBI Data DE 2 Let us consider SBI 13H as a ... Read More

In 8085 Instruction set, SBB R is mnemonic used for multi-Byte subtraction. Let us consider the following example on such subtraction In this above example, the subtraction of 62H and F1H will result in 71H with a borrow of 1. Next, we have to subtract 44H and 13H along with this borrow value of 1. In the above tracing we have shown you how the internal calculations are being done. Now in 8085, to facilitate such an operation, SBB instruction has been provided to subtract two numbers along with the borrow value. SBB is a mnemonic that stands for ... Read More

In 8085 Instruction set, DCR is a mnemonic, which stands for ‘DeCRement’ and ‘R’ stands for any of the following registers, or memory location M pointed by HL pair. R = A, B, C, D, E, H, L, or M This instruction is used to decrease the content of register R. Also we can say it will subtract 1 from the register R content. And the decremented value will be stored on to the register R itself. As it is an arithmetic instruction, so all flags, except Cy flag, are affected depending on the result. In those assembly ... Read More

In 8085 Instruction set, SUI is a mnemonic that stands for ‘SUbtract Immediate from Accumulator and here d8 stands for any 8-bit or 1-Byte data. This instruction is used to subtract 8-bit immediate data from the Accumulator. The result of the subtraction will be stored in the Accumulator over witting its previous content. As it is an arithmetic instruction, so flag bits are affected based on the result. It is a 2-Byte instruction and occupies 2-Bytes in memory. Mnemonics, Operand Opcode(in HEX) Bytes SUI Data D6 2 When we issue SUI d8 instruction then ... Read More

In 8085 Instruction, SUB is a mnemonic that stands for ‘SUBtract contents of R from Accumulator. Here R stands for any of the following registers, or memory location M pointed by HL pair. R = A, B, C, D, E, H, L, or M Mnemonics, Operand Opcode(in HEX) Bytes SUB A 97 1 SUB B 90 1 SUB C 91 1 SUB D 92 1 SUB E 93 1 SUB H 94 1 SUB L 95 1 SUB M ... Read More

In 8085 Instruction set, ACI is a mnemonic which stands for 'Add with Carry Immediate to Accumulator' and here “d8” stands for any 8-bit or 1-Bytedata. This instruction is actually meant for adding one 8-bit immediate data or operand to the Accumulator along with the carry value. The result of the addition will be stored in the Accumulator itself and replacing initial value of the Accumulator. As it is an arithmetic instruction, so the flags are affected based on the result. It holds 2-Bytes in the memory. Mnemonics, Operand Opcode(in HEX) Bytes ACI Data CE 2 ... Read More

In 8085 assembly language coding, sometimes there is a requirement to add two numbers and where each of these numbers are having several Bytes in size. As example, let us add the following two 16-bit numbers. 1 10 50H A0 F1H ------ B1 01H In this example, the addition of 50H and F1H results in a sum of 01H with a carry of 1. Now, we are supposed to add 10H and A0H along with this carry of 1. To carry out ... Read More

In 8085 Instruction set, INR is a mnemonic that stands for ‘INcRement’ and ‘R’ stands for any of the following registers or memory location M pointed by HL pair. R = A, B, C, D, E, H, L, or M This instruction is used to add 1 with the contents of R. So the previous value in R will get increased by amount 1 only. The result of increment will be stored in R updating its previous content. All flags, except Cy flag, are affected depending on the result thus produced. In different assembly language core, this instruction ... Read More