At 09:03 AM 6/25/99 , you wrote: >OK, so I've looked carefully at the data sheets and I STILL can't I just caught this thread so ignore this if somebody already pointed this out.... Most of the new suffixes in the 16C6x/7x imply a die shrink, bug fix AND an enhanced USART. Look at the serial peripheral descriptions. I don't remeber exactly off-hand but I think the enhancement was adding a couple of bits to the I2C moudle to support hardware master modes. (?) Jerry Merrill jerrym@tech-tools.com http://www.tech-tools.com FAX: (972) 494-5814 VOICE:(972) 272-9392 TechTools PO Box 462101 Garland, TX 75046-2101