XCHG - Exchange



	Usage:	XCHG	dest,src
	Modifies flags: None


	Exchanges contents of source and destination.


				 Clocks			Size
	Operands	 808x  286   386   486		Bytes

	reg,reg		  4	3     3	    3		  2
	mem,reg 	17+EA	5     5	    5		 2-4  (W88=25+EA)
	reg,mem 	17+EA	5     5	    3		 2-4  (W88=25+EA)
	accum,reg	  3	3     3	    3		  1
	reg,accum	  3	3     3	    3		  1


	- see Instruction Timing