Lpc2000

Hello,

I making a little protocol to interfase between a LPC2106 and an Atmel
8bits MCU. My idea is to use an 8bit data bus (P0.14 to P0.21) for
sending and receiving bytes, and then a few control lines (Busy/Ready,
Clock, Enable, Command/Data). 
How can I write a byte variable (char) to that 8bit port? and how can
I read that data port, and save it on a variable? being P0.14 is the
Least Significative bit.

Thanks
Kimi