On Wed, 1 Jul 2009 23:56:02 -0500 "Steve Maroney" wrote: > I need a method of keeping data not destined for the 2nd microcontroller > away from it while addressing the LCD. I thought I could put some > 2n2222's in line with my 4 shared data lines. When I need send data to > the other microcontroller, I would bring the base of on my 4 transistors > high, send the data, and bring it back low. I suggest you check the CD4066 quad analog switch. Seems a lot simpler than using discrete transistors. No resistors necessary either. John -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist