On April 16, 2014 12:17:33 PM PDT, Bob Ammerman wro= te: >On one project I used it by polling the incoming data line, looking for >a >transition to high (the start bit). By having the host start each >message >with a byte of 0x0F you will see a 5 bit high time (the start bit and 4 >one-bits of data) followed by a 5 bit low time (the high order zero >bits of >the data followed by a zero for the stop bit). Bear in mind that for TTL-level asynchronous serial as seen on a PIC, start= bits are generally 0 and stop bits (and line idle state) 1, so 0xF0 would = be more suitable. --=20 Christopher Head Sent from my phone; if you need a digital signature, ask for a resend. --=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 .