In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Frank,
  When you access the WKPND_B register via "MOV !RB,W" it does a SWAP with the W register.
  So the contents of W get put INTO WKPND_B and the previous contents of WKPND_B get put back into W.

  MOV M,#$09
  MOV W,#0
  MOV !RB,W ; This swaps the values in WKPND_B and W

Bean.

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