FLDCW             Load Control Word           Exception Flags: None

FLDCW memory operand

       Logic:      control word . memory operand

     The FLDCW instruction loads a control word from memory into the
     coprocessor control word.

     This instruction is used to quickly change the coprocessor's mode of
     operation. You should clear any exceptions before loading a new control
     word.

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   Operands            Clocks         Bytes           Example
   FLDCW memory operand 7-14+EA         5             FLDCW CONTROL_WORD
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        Note:          If an exception bit is set, loading a control word
                       that unmasks that exception and clears the interrupt
                       enable mask produces an interrupt request before the
                       next instruction is executed.