If your using something like Hyperterminal to get the RS-232 data from your MCU, you need to be mindful of a few settings.
For example, your MCU has 8-bit or 9-bit data modes and a parity option.
The parity takes up 1 bit, so if your in 8-bit mode you actually have 7 data bits and if your in 9-bit mode you actually have 8 data bits.
Flow control on your Hyperterminal (or whichever your using) should be set to "None" for now, later on you can try experimenting with "XON / XOFF" and "Hardware" settings.
Also keep in mind some serial terminal programs have tight tolerances for baud speeds. If one speed doesn't work, try a different one.