Microchip MCP41xxx Digital Potentiometer Code Trouble

Can someone possibly explain to me why this code would not work? When I run it the digital pot does nothing.

Code:

---

    si      var    portb.2
    sclk    var    portb.1
    cs      var    portb.0

    pot_value  var    byte
    data_word  var    word

    low    sclk    ' Set clock pin low
    high    cs      ' Set chip select low

    clear
   
start:
    pot_value = pot_value + 1
    data_word.byte0 = %00010001    ' Set write instruction to potentiometer 0
    data_word.byte1 = pot_value    ' Set potentiometer value to be written
    gosub shout
    goto start                     

shout:
    low cs
    shiftout si,sclk,1,[data_word\16]  ' Shift 16 bits out starting at bit0
    high cs
    return

---

Hello.
Maybe you must first shiftout write command and after that shiftout value.

Regards,
Damir

I thought I orginally tried that way and it didn't work however it does now so I can only assume I had something missed. Anyways though, what I want to do is to daisy chain three of these together. According to the data sheets when a command comes in a NOP is sent out the serial output line which loads the 2nd chip with all 0's. Now if I issue this command now and add a NOP after it should it not push it into the 2nd chip?

I figured out the source to all my problems. I originally had the SPI lines on porte which didn't work so I moved them over to portb and then everything worked fine. The reason I had so my problems is because I forgot to sent porte to digital instead of analog, oops.