Thanks Darrel.

I think, I just don't get what SPI is. I assume it is a "better" or "easier" way to make things communicate.

However, I don't understand what and how I do have to implement things.

Again, my goal is to simply send the universal "Hello World!" on a SPI display.

I'm using a 16F690 that has an SSP module; fine. I see, there are two registers SSPSTAT and SSPCON I'll have to define.

Well then, let's enable the SSP module: SSPCON.5=1. Great!

And now, what do I need to do to make my LCD display the famous phrase?

I'm completely lost