ShiftOut. Using PIC as Slave device.

[Charles Linquis]

Something like this should work (untested). Note that is "blocking", and that the code will not advance past this until you get 8 high-to-low transitions on the clock.

GetNextByte:

BitCounter = 0
GetNextBit:
  While ClockPin=1:Wend                 ; Sits here and does nothing while clock pin is high
    DataByt.0 = DataPin                 ; Samples data pin as soon as clock goes low
    BitCounter = BitCounter + 1         ; Keeps track of number of bits received
    If BitCounter = 8 then goto GotByte ; When we have a byte, get out
    DataByt = DataByt << 1              ; Move things over for next bit
  WHILE ClockPin=0:WEND                 ; Sit here while clock is low
    Goto GetNextBit                     ; Grab next bit if we haven't got all 8
    
GotByte:
...
...
...
 END

[TonyA]

Thank you for the help and advice, I appreciate it.

Tony A