> I never was able to make it work on a 16F, however. But then, I tend to = avoid Microchip libraries. I had no problem getting both master and slave code running on 16F876 chips= .. I used the Microchip AN74x? code, but was alerted to a missing line of co= de in one of them by someone on this list who had also used it. Because of = that I had it working more or less straight out of the box. The code in the= app notes doesn't use interrupts but I modified to do so. Didn't take a lo= t of effort to change. =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .