Why can't you use 255 in PWM?

[Andrew]

I've heard that most people don't allow their PWMs to go to 255 and that it has something to do with the serout command. Nowhere in the serout documentation is there a reason given, so I assumed it had something to do with the RC.

Is it because IFI uses 0xff, 0xff as a marker for start of data sequence? If 2 PWMs next to each other in the serial stream were to max out at the same time, it would appear to the master uP as if the data stream had restarted and the remaining variables would be shifted.

If someone knows anything different, I'd appreciate a heads up.