RS232 chargen reset problem

Ok. Now it's fine.

You could possibly remove these lines

      if(LETTER == 7'h7e)
	    LETTER <= 7'h21;
     else

since they are useless: infact when LETTER reaches 7e , ENABLE becomes false and you wouldn't get here any more, until after the RST_B signal has restored LETTER to 7'h21 initial value.

I'd also replace the if(!ENABLE) statement with the actual test on COUNTER value, because imho it is clearer.

Please note that your code is already ok as it is. The suggested changes won't affect its functionality but only serves to improve readability and better understanding the way code operates. This may seem not worthy here but it becomes fondamental in a bigger design.