How do you program the micro controller to control a parallel in/serial out shift register? I would like to increase my pins by using them.. I just dont know how to go about sending the clock to the register and how to even send the register the binary to tell it what to do.. thanks

Hey EdsJunk,

I put together a short and, hopefully, not too incoherent an explanation about something very related: performing write operations to a NerdKits LCD using two MCU output pins and a shift register: 2-wire LCD interface. I can't take credit for the circuit itself, I just tried to figure how it works.