Weird SPI interface: VIH to VIHH for CS?

[mister_e]

I wouldn't leave a pin floating myself, mainly SHDN. On the other hand, by their specs, they says there's a "Smart Pull-Up" inside... how smart it is... who knows

Your code seems to be ok to me, but you still haven't added the LOW CS in there... not sur if this could help though...

PS: Make sure your DEFINEs are all in UPPERCASE.

Do you have a PICKIT 2? in this case you could monitor what happen on CS/CLK/SDI and SDO

Do you have a complete schematic of your thing?

EDIT: Try this one

        define OSC 8
        
        cmcon=7
        res var byte
        Command var WORD
        CS var porta.2 'CS
        CLK var porta.3 'CLK
        SI var porta.4 'SI
        LED var porta.1 'LED
        
        high CS
        LOW CLK
        high LED
        pause 500
        low LED
        pause 500
        high LED
        
        res=24

repeatit:
        command.highbyte=0 ' Volatile Wiper 0
        comand.lowbyte=res
        low CS
        shiftout SI,CLK,1,[command\16]
        high CS
        
        pause 10
        
        Command.HighByte=%00010000  ' Volatile Wiper 1    
        low CS
        shiftout SI,CLK,1,[Command\16]
        high CS
        
        pause 500
        res=res+32
        
        goto repeatit