Register EXchanGe

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.

SEE ALSO
	SWAP