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After an ADD instruction, the flags affected typically include the Zero Flag (ZF), which is set if the result is zero; the Sign Flag (SF), which indicates the sign of the result; the Carry Flag (CF), which is set if there is a carry out of the most significant bit; and the Overflow Flag (OF), which is set if there is an overflow in signed arithmetic. Additionally, the Parity Flag (PF) may also be affected, depending on the result's parity.
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What are the flags affected after add instruction execution?
After the execution of an ADD instruction, the following flags in the processor's status register may be affected: the Zero Flag (ZF), which is set if the result is zero; the Sign Flag (SF), which indicates if the result is negative; the Carry Flag (CF), which is set if there is an overflow from the most significant bit; and the Overflow Flag (OF), which is set if the addition results in an overflow for signed integers. Additionally, the Parity Flag (PF) may also be updated based on the parity of the result.
Which registers are changed by the cmp instruction?
MP Compares the first source operand with the second source operand and sets the status flags in the EFLAGS register according to the results. The comparison is performed by subtracting the second operand from the first operand and then setting the status flags in the same manner as the SUB instruction. When an immediate value is used as an operand, it is sign-extended to the length of the first operand. So, only the flags are affected. Operation: temp = Source1 - SignExtend(Source2); ModifyStatusFlags(); //Modify status flags in the same manner as the SUB instruction Flags affected: The CF, OF, SF, ZF, AF, and PF flags are set according to the result.
What is difference between INR and INX instruction?
INR increment the content of register/memory by 1and result is stored in same place. INX increment the register pair by 1(no flags are affected)
Which group of instruction do not affected the flag in microprocessor?
branch instruction
ADD instruction of 8085?
The ADD instruction in the 8085 microprocessor is used to add the contents of a specified register or memory location to the accumulator (register A) and store the result back in the accumulator. It can be used with registers like B, C, D, E, H, and L, or with a memory address specified. The operation affects the flags in the status register, reflecting conditions such as zero, carry, and parity. The instruction takes 1 byte and 1 machine cycle to execute.
How compare instruction is used in 8085?
The compare and subtract instructions in the 8085 both subtract one operand from another, and set flags accordingly. The subtract instruction stores the result in the accumulator, while the compare instruction does not - except for the flags, the compare instruction "throws" the result away.
What are the instruction to reset RST 7.5?
To reset the pending RST 7.5 instruction in the 8085, you need to execute a SIM instruction with a particular value in the accumulator. PUSH FLAGS MVI A,10H SIM POP FLAGS Of course the PUSH and POP are optional, if you don't need to preserve the value of the accumulator.
How do you add new machine language instruction to a processor intsruction set?
To add a new machine language instruction to an processor instruction set, you need to replace the microcode of the processor.
Which flags effected after SUB B excution in 8085 miro processor?
All flags are affected after the SUB operation to reflect the result of subtraction.
What is function of nop in microprocessor?
The NOP instruction is short for no-operation. It is an executable instruction that does nothing to the processor, its registers, or its flags. It is useful in timing loops, or to provide room for patchabilty of a piece of code.
What is the instruction to add the data in register B to the data in accumulator?
add B
What is compare instruction 8086 microprocessor?
the compare instruction of 808 is used to compare the 2 operands. syntax: cmp op1,op2 algorithm: op1-op2 the value of the operands are not affected only the flags are updated if op1<op2 carry=1 and zero flag=0 if op1=op2 cy=0 and zf=1 if op1>op2 cy=0 and zf=0
