Newhaven 4x40 LCD, issues!

[Christopher4187]

Talk about timing. I just received two Newhaven OLED 4x20 LCD's in the mail today (http://www.newhavendisplay.com/specs...420DZW-AY5.pdf). A couple of questions:

I am putting this on a Microchip demo board (MCP2515) and I can't use all of Port B. Can I use any 8 pins that are free? Also, what is 4 bit operation and is it worthwhile to use it? The datasheet says that 4 lines aren't used when it's in 4 bit operation so I'm curious of using 4 less pins would be advantageous without losing any clarity on the LCD screen.

Sorry to hi-jack the thread but it seems appropriate in this case.