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

If you look under the hood, this line of SX/B:

  WKPND_B = rbStatus

... produces this code:

  MODE $09
  MOV !RB, rbStatus
  MOV rbStatus, W

So the effect is that WKPND_B and rbStatus are exchanged.  I've updated the program (attached above) to clear rbStatus before the exchange -- this gets what's in WKPND_B and clears it at the same time.

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