XCHG             Exchange Registers                  Flags: not altered

XCHG destination,source

Logic:    destination <--> source

XCHG switches the contents of its operands, which may be either bytes

or words.

Operands                  Clocks   Transfers  Bytes   Example

                        byte(word)

accumulator, reg16          3          -        1     XCHG AX,SI

memory, register       17(25) + EA     2       2-4    LOCK XCHG SEMPHOR, DX

register, register          4          -        2     XCHG CL,DL

Notes:         Used in conjunction with the LOCK prefix, this

instruction is particularly useful when implementing

semaphores to control shared resources.

Prev:     WAIT Wait

See also: MOV

See also: PUSH

See also: POP

See also: XLAT

See also: EA

Next:     XLAT Translate