Shawn Tan Ser Ngiap wrote: > The issue i'm thinking of is: if the pulse train doesn't shift > positionally, from time to time, to cater to the async nature of the > incoming signal, But that's the point, it does. The frequency may be fixed, but think of it as the phase being reset to 0 at the leading edge of every start bit. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist