Hi guys, I'm trying to use my PIC16F687's Tx port on the EUSART as a dual function pin, ie as a connect detect input and as a Tx channel. So here's the question, what's the maximum safe loading on the Tx port when its doing RS232, I'm imagining its in the region of 2mA, but I can't find any details on the datasheet, and its seems unlikely it would match the 20mA of the GPIOs... Thanks - you lot are the best.... Ed Oh wont be running above 57.6k, incase that's at all relevant, and I'm at 3.3v -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist