wData is assigned a value and then you GOSUB a routine called SEND.

SEND, in turn, GOUSBs a routine called OutByte where a loop itterates thru the individual bits in wData and GOUSBs either SendOne or SendZero which puts the state of the bit on the pin aliased as Sda, which in your code is PortC.5, not PortC.3.

/Henrik