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

The "temp = option" is not valid because the OPTION register is write only.

Okay there IS a secret instruction that will read the option registers. 
Try replacing "temp = option" like this:

  \ DW $001      ' Put OPTION register into W "secret instruction"
  \ MOV temp,W
   temp=temp ^ %01000000
   option=temp
 

  \ DW $001      ' Put OPTION register into W "secret instruction"
  \ MOV temp,W
   temp=temp & %10111111
   option=temp


I don't know if this will work, but in theory it should.

Bean.

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