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  • Assembly之instruction之JUMP

    JMP      Jump unconditionally

    Syntax   JMP  label

    Operation   PC + 2 × offset −> PC

    Description

      The 10-bit signed offset contained in the instruction LSBs is added to the program counter.

    Status Bits

      Status bits are not affected.

    Hint:

      This one-word instruction replaces the BRANCH instruction in the range of −511 to +512 words relative to the current program counter.

    JNE   Jump if not equal

    JNZ   Jump if not zero

    Syntax   JNE  label; JNZ label

    Operation   If Z = 0: PC + 2 × offset −> PC
            If Z = 1: execute following instruction
    Description

      The status register zero bit (Z) is tested. If it is reset, the 10-bit signed offset contained in the instruction LSBs is added to the program counter. If Z is set, the next instruction following the jump is executed.


    Status Bits   Status bits are not affected.


    Example  Jump to address TONI if R7 and R8 have different contents.

    1 CMP R7,R8  ; COMPARE R7 WITH R8
    2 JNE TONI   ; if different: jump
    3 ......    ; if equal, continue
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  • 原文地址:https://www.cnblogs.com/mengdie/p/4515774.html
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