Hello John,

Check your crystal frequency. I don't think you can get 31,250 baud @ 12 MHz. Normally 11,059 MHz is used to get reliable high baud rates (something faster than 2400).

Also the TI and SI flag can screw up the best laid plans. Make sure you handle it properly.

Handling serial in assembly is so much simpler than C you might want to rewrite your code and just copy examples from the tutor section

Good luck,

Charles Bannister