I just went through a similar thing with the very same board.
I ended up copying the ASM code for the serial setup from one of AD's example code snippets. I think my compiler (Basic BXC51) gives the wrong values or
what I really mean is there is confusion about the actual clock speed of the critter.
And using a different timer too?
Can't claim I know WHY but...
This works on a 8031: (9800 8n1)


MOV PSW,#0
MOV SCON,#05AH
MOV TMOD,#21H
MOV TCON,#84H
MOV T2CON,#0H

this works on the aduc832:

;CONFIGURE UART FOR 9600 BAUD AT DEFUALT CORE FREQ OF 2.097152MHZ')
MOV T3CON,#82H')
MOV T3FD,#02DH')
MOV SCON,#52H')
; enable the intenal On-Chip RAM')
ORL CFG832, #01h')

Have fun...