109. ROtate Left with eXtend and ROtate Right with eXtend

109.1. Name

ROXL, ROXR -- Rotate left with extend and rotate right with extend

109.2. Synopsis

        ROXd        Dx,Dy
        ROXd        #<data>,Dy
        ROXd        <ea>
        where d is direction, L or R

        Size = (Byte, Word, Long)

109.3. Function

A rotation is made on destination operand bits. Rotation uses bit X.

                  +-------->-----------+
        ROXL:     |                    |
              C <------ OPERAND <- X --+
                          <---

        ROXR:    +---------<-------+
                 |                 |
                 +-- X -> OPERAND -----> C
                           --->

109.4. Format

        In the case of the rotating of a register:
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        -----------------------------------------------------------------
        |15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
        |---|---|---|---|-----------|---|-------|---|---|---|-----------|
        | 1 | 1 | 1 | 0 |  NUMBER/  |dr |  SIZE |i/r| 1 | 0 | REGISTER  |
        |   |   |   |   |  REGISTER |   |       |   |   |   |           |
        -----------------------------------------------------------------

        In the case of the rotating of a memory area:
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        -----------------------------------------------------------------
        |15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
        |---|---|---|---|---|---|---|---|---|---|-----------|-----------|
        | 1 | 1 | 1 | 0 | 0 | 1 | 0 |dr | 1 | 1 |    MODE   | REGISTER  |
        ----------------------------------------=========================
                                                          <ea>

NUMBER/REGISTER
        Specifies number of rotating or number of register which contents
        the number of rotating.
        If i/r = 0, number of rotating is specified in the instruction as
        immediate data
        If i/r = 1, it's specified in the data register.
        If dr = 0, right rotating
        If dr = 1, left rotating

SIZE
        00->one Byte operation
        01->one Word operation
        10->one Long operation

REGISTER
        For a register rotating:
        Indicates the number of data register on which rotating is applied.

        For a memory rotating:
        <ea> indicates operand which should be rotated.
        Only addressing modes relatives to memory are allowed:

        --------------------------------- -------------------------------
        |Addressing Mode|Mode| Register | |Addressing Mode|Mode|Register|
        |-------------------------------| |-----------------------------|
        |      Dn       | -  |     -    | |   (Abs).W     |111 |  000   |
        |-------------------------------| |-----------------------------|
        |      An       | -  |     -    | |   (Abs).L     |111 |  001   |
        |-------------------------------| |-----------------------------|
        |     (An)      |010 |No reg. An| |   (d16,PC)    | -  |   -    |
        |-------------------------------| |-----------------------------|
        |     (An)+     |011 |No reg. An| |   (d8,PC,Xi)  | -  |   -    |
        |-------------------------------| |-----------------------------|
        |    -(An)      |100 |No reg. An| |   (bd,PC,Xi)  | -  |   -    |
        |-------------------------------| |-----------------------------|
        |    (d16,An)   |101 |No reg. An| |([bd,PC,Xi],od)| -  |   -    |
        |-------------------------------| |-----------------------------|
        |   (d8,An,Xi)  |110 |No reg. An| |([bd,PC],Xi,od)| -  |   -    |
        |-------------------------------| |-----------------------------|
        |   (bd,An,Xi)  |110 |No reg. An| |    #data      | -  |   -    |
        |-------------------------------| -------------------------------
        |([bd,An,Xi],od)|110 |No reg. An|
        |-------------------------------|
        |([bd,An],Xi,od)|110 |No reg. An|
        ---------------------------------

109.5. Result

        X - Set by the last bit out of operand.
            Not changed if rotation is zero.
        N - Set if the result is negative. Cleared otherwise.
        Z - Set if the result is zero. Cleared otherwise.
        V - Always cleared
        C - Set according to the last bit shifted out of the operand.

109.6. See also

ROL ROR ASL ASR LSL LSR