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Explain the 8086 instructions
written 7.8 years ago by gravatar for teamques10 teamques10 ★ 65k modified 2.2 years ago by gravatar for sagarkolekar sagarkolekar ★ 11k

Explain the following 8086 instructions

a)CMPSB b)DIVAX c)LOOPE again d)REP e)SCASB f) XLATB
microprocessors and microcontrollers
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written 7.8 years ago by gravatar for teamques10 teamques10 ★ 65k

  • CMPSB-

    Mnemonic: CMPSB (compare string byte)

    Algorithm:

    DS: [SI] – ES: [DI]

    Set flags according to result → OF, SF, ZF, AF, PF, CF

    If DF = 0 then

    SI = SI + 1

    DI = DI + 1 else

    SI = SI – 1

    DI = DI – 1 …

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