one other data point....this is only happening when the slave is actually connected to the master. If I pull the connection, it cycles and I see data on the sda/scl lines and I no longer get the WCOL bit set. Going to verify I have the SDA and SCL wired correctly. Does the slave ack the start bit? --------------------------------- Access over 1 million songs - Yahoo! Music Unlimited. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist