NAME	EXG -- Register exchange
SYNOPSIS	EXG Rx,Ry Size = (Long)
FUNCTION	Exchanges the contents of any two registers.
FORMAT	15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 1 0 0 Rx REGISTER 1 OP-MODE Ry REGISTER "Rx REGISTER" specifies a data or address register. If it's an exchange between a data register and an address register, this field define the data register. "Ry REGISTER" specifies a data or address register. If it's an exchange between a data register and an address register, this field define the address register.
OP-MODE	01000 -> Exchange between data registers. 01001 -> Exchange between address registers. 10001 -> Exchange between data and address registers.
RESULT	None.

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