OscFreq is defined in the Serial Monitor .def file as your board's crystal frequency. You can use as high as a 16MHz crystal with the DT256.
From the Serial Monitor source code:
BusFreq = ((OscFreq/(initREFDV+1))*(initSYNR+1))
baud115200 equ (BusFreq/16)*10/1152
The above equations come from the Device Guide sections detailing the clock and oscillator operations.
Again, make sure you choose the correct target MCU and OscFreq in the Serial Monitor .def file before assembling and loading the serial monitor into your board.
Best regards,
Carl Barnes
www.technologicalarts.com
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