Table of Contents
- 1 What type of instruction is CMP?
- 2 How does CMP instructions work?
- 3 What does CMP mean in assembly?
- 4 What is CMP instruction in arm?
- 5 What is the use of DAA instruction?
- 6 Is CMP instruction signed?
- 7 Which register is affected by CMP B instruction?
- 8 Which is an example of a CMP instruction?
- 9 What does CMP stand for in the 8085 instruction set?
- 10 How are flags set in a CMP instruction?
What type of instruction is CMP?
In 8085 Instruction set, CMP is a mnemonic that stands for “CoMPareAccumulator” and hereR stands for any of the following registers, or memory location M pointed by HL pair. This instruction is used to compare contents of the Accumulator with given register R.
How does CMP instructions work?
The CMP instruction subtracts the value of Operand2 from the value in Rn . This is the same as a SUBS instruction, except that the result is discarded. The CMN instruction adds the value of Operand2 to the value in Rn . This is the same as an ADDS instruction, except that the result is discarded.
What is the meaning of the instruction CMP A?
COMPARE is an important instruction widely used in 8085 microprocessor. The 8085 instruction set has two types of Compare operations: Compare with accumulator (CMP) and Compare immediate with accumulator (CPI).
What does CMP mean in assembly?
Compare Two Operands
Compare Two Operands (cmp) (IA-32 Assembly Language Reference Manual)
What is CMP instruction in arm?
The CMP instruction subtracts the value of Operand2 from the value in Rn . This is the same as a SUBS instruction, except that the result is discarded. This is the same as an ADDS instruction, except that the result is discarded. In certain circumstances, the assembler can substitute CMN for CMP , or CMP for CMN .
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 the use of DAA instruction?
The DAA instruction is only useful when it follows an ADD instruction that adds (binary addition) two 2-digit, packed BCD values and stores a byte result in the AL register. The DAA instruction then adjusts the contents of the AL register to contain the correct 2-digit, packed BCD result.
Is CMP instruction signed?
Performs a comparison operation between arg1 and arg2. The comparison is performed by a (signed) subtraction of arg2 from arg1, the results of which can be called Temp.
Which flags are affected by CMP instruction?
CMP and TEST instructions affect flags only and do not store a result (these instruction are used to make decisions during program execution). These instructions affect these flags only: CF, ZF, SF, OF, PF, AF.
Which register is affected by CMP B instruction?
While CMP B instruction executes, microprocessor compares the contents of register B with the contents of the accumulator. The comparison is shown by setting all the flags. The flags S, P, AC are modified and flag Z and CY reflects the result of the operation. So, all flags will be affected.
Which is an example of a CMP instruction?
If you did sub arg2, arg1 and they happen to be equal, one of them would be zero afterwards. With cmp they are both still there. the results of CMP is changing the values of ZF and CF, this is some examples to understand very much CMP instruction.
What is the difference between CMP and CMN in assembler?
The CMP instruction subtracts the value of Operand2 from the value in Rn. This is the same as a SUBS instruction, except that the result is discarded. The CMN instruction adds the value of Operand2 to the value in Rn . This is the same as an ADDS instruction, except that the result is discarded.
What does CMP stand for in the 8085 instruction set?
In 8085 Instruction set, CMP is a mnemonic that stands for “CoMPareAccumulator” and hereR 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 compare contents of the Accumulator with given register R.
How are flags set in a CMP instruction?
CMP instruction sets status flags according to the comparisons between the arguments. See : wikipedia’s FLAGS page The importance of CMP applies mostly in conditional code execution (Jump – See : assembly_conditions ).