Delta Electronics DUP-B SWAP (Swap High-Byte and Low-Byte Data) , XCHG (Exchange Data)

Chapter 3 Creating and Editing Screens
 SWAP (Swap High-Byte and Low-Byte Data)
Equation
SWAP (Var1, Var2, Var3)
Explanation
Swap high-byte and low-byte of Va r3 number of words s tarting at Var2 an d save it in
memory starting at Var1.
Remark
 The calculation result can be stored as unsigned WORD.
 Var1 and Var2 can be internal memory only. Var3 can be internal memory or
constant.
Example
Swap the high-byte and low-byte of $11 and store the result in $2 (this is an
operation of unsigned 16-bit data).
If $11 = 1234H, after executing SWAP command, $2 = 3412H.
 XCHG (Exchange Data)
Equation
XCHG (Var1, Var2, Var3)
Explanation
Exchange Var3 number of words of data starting at Var2 with the same number of
words starting at Var1.
Remark
 The calculation result can be stored as unsigned WORD.
 Var1 and Var2 can be internal memory only. Var3 can be internal memory or
constant.
Revision May, 2010 3-337