Something else I would like to know is about how can I separate a 16 bin value of a variable into
2 8bin variables. For example x = 0B1111111100000001, I would like y to be 0B11111111 and
z = 0B00000001 in order to send them with shiftout (using 2 shift registers) to another chip.
So, you WERE able to find the reference page. Too bad you didn't spend just a little bit longer there. That's a page well worth spending more then 2 minutes at. You should at least familiarize your self with the available functions, even if you don't study things like highByte and lowByte. Just knowing that they are there is useful.