SWAP Variable

Function
Exchanges the upper and lower elements of Variable.

• Variable  is a byte (including an array element) or word variable.

Explanation
The SWAP instruction exchanges the upper and lower nibbles of a byte, or the upper and lower bytes of a word.

Main:
  RB = $3F
  SWAP RB                                       ' RB now holds $F3
  result = $0A55
  SWAP result                                   ' result now holds $550A