What is sub instructions?
SUB Instruction. The SUB instruction performs a subtraction on the first source register’s contents by the second source. register’s contents, and stores the result in the destination register. It’s syntax is: SUB $destination register’s address, $first source register’s address, $second source register’s address.
What is the purpose of Xchg instruction?
In 8085 Instruction set, there is one mnemonic XCHG, which stands for eXCHanGe. This is an instruction to exchange contents of HL register pair with DE register pair. This instruction uses implied addressing mode. As it is1-Byte instruction, so It occupies only 1-Byte in the memory.
What operation does sub R perform in 8085?
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….Instructions to perform subtraction in 8085 Microprocessor.
| Mnemonics, Operand | Opcode (in HEX) | Bytes |
|---|---|---|
| SUB H | 94 | 1 |
| SUB L | 95 | 1 |
| SUB M | 96 | 1 |
What is the difference between sub and CMP instruction?
CMP is used for comparing 2 registers by subtraction them from one another, but answer is not saved, whereas SUB subtracts 2 registers and saves the answer. The main difference between cmp and sub is that cmp does not store the result of the subtract operation; it performs subtraction only to set the status flags.
What is sub in assembly language?
The SUB instruction performs integer subtraction. It evaluates the result for both signed and unsigned integer operands and sets the OF and CF flags to indicate an overflow in the signed or unsigned result, respectively.
What is the addressing mode of Xchg instruction in 8085?
In 8085 instruction XCHG, stands for eXCHanGe. This is an instruction to exchange the contents of the HL register pair with the DE register pair. This instruction uses the implied addressing mode. It is 1-Byte instruction, so It occupies only 1-Byte in the memory.
What is LXI instruction in microprocessor?
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.
What is Subb in 8051?
Home » Instructions » SUBB. The SUBB instruction subtracts the specified byte variable and the carry flag from the accumulator. The result is stored in the accumulator. This instruction sets the carry flag if a borrow is required for bit 7 of the result.
What is the instruction XTHL mean?
eXchange Top of stack with HL
In 8085 Instruction set, XTHL is a mnemonic that stands for “eXchange Top of stack with HL”. This instruction exchanges the contents of the top two locations of the stack with the contents of register pair HL.
What is LXI instruction?
What is Sta address?
In 8085 Instruction set, STA is a mnemonic that stands for STore Accumulator contents in memory. In this instruction,Accumulator8-bit content will be stored to a memory location whose 16-bit address is indicated in the instruction as a16. This instruction uses absolute addressing for specifying the destination.
What does sub mean in 8085 instruction?
In the subtraction of two numbers, 8085 imposes the restriction that Accumulator will have one of the operands from which the other operand specified by one of the following will be subtracted. —Eight-bit immediate data. In 8085 Instruction, SUB is a mnemonic that stands for ‘SUBtract contents of R from Accumulator’.
What is the use of Sui in 8085 microprocessor?
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.
How does 8085 handle the subtraction of two numbers?
In the subtraction of two numbers, 8085 imposes the restriction that Accumulator will have one of the operands from which the other operand specified by one of the following will be subtracted.
What are the arithmetic instructions in 8085 microprocessor?
Arithmetic instructions perform various arithmetic operations such as addition, subtraction, increment, and decrement. The complete list of arithmetic instructions in 8085 is described in the following table.