Code:
temp       var word

' code to send bit11-bit15
temp=PLL>>11
shiftout data_pin, clock_pin, 0, [temp\5]

' code to send bit0-bit10
shiftout data_pin, clock_pin, 0, [PLL\11]
'                             
'                             ^
'                             ^
' The 0's here means it will send the least significant
' bits first. i.e for the second section: bit0 first,
' then bit1, then bit2, etc. If you want it to send the
' most significant bits first you should set this to 1.