Weird ADC / Math Results with 9-Bit PWM

[RossWaddell]

I expect something to show on the LCD, but it stays blank.

EDIT: I moved the LCD instructions to the loop to see what I could see and the final PWDuty value is 12291, way more than 512. The LED now ramps up in brightness but then drops down once the duty exceeds 512. I also needed to add a pause after the LCD initialization in order to see anything on the screen).

FadeInPause   CON 5         ; Pause during LED fade in

' Fade in LED to set brightness
FOR i = 0 to 100             ; must match ARRAY SIZE of data table above
    ReadCODE  (DataTable + i), DataWord
    PWMDuty = DataWord

    GOSUB ChngLEDBrightness 
         
    #IFDEF USE_LCD_FOR_DEBUG
        HSEROUT [LCD_INST, LCD_CLR]
        pause 5
        HSEROUT ["PWMDuty=",DEC PWMDuty,"  "]
    #ENDIF
   
    pause FadeInPause
NEXT i

Where the heck is it getting 12291?