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MICROPROCESSOR INSTRUCTION REFERENCE->SWAP
SWAP Swap Data Register Halves
Register b31..16 <-> Register b15..b0
Assembler Syntax: SWAP Dn
Size: Word
Exchange the 16-bit words (halves) of a data register.
Condition Codes:
N Set if bit 31 of result is set, else cleared
Z Set if result = 0, else cleared
V Always cleared
C Always cleared
X Not affected