#UART

I've been struggling with this for weeks... so I was trying to implement a UART protocol on my microcontroller and I just couldn't seem to get it right?? I mean, I've done it before, but this time it was like pulling teeth... I was starting to think I'd never get it working. But then I took a step back, re-read the datasheet... and it hit me - I had my clock speed set wrong. Such a simple mistake, but it was driving me crazy. Now that it's working, I can finally move on to implementing the rest of my project... which is a big relief. Does anyone else have any experience with UART on microcontrollers?? What were some of the challenges you faced?