Strange unliked noise (6.8 MHz Sine signal) on 6211DSK ?

[johnattan]

Hi dear all,

Hope if any can help me in my issue,

I have "320C6211 DSK" and CCS 3,
When i try to run any simple application like generating a square or sine waveform, i always have my desired signal BUT WITH AN ANOTHER UNDESIRED AND UNLIKED ADDED 6.8 MHz SINE SIGNAL with a constant frequency and amplitude all time (6.8 MHz, 1.8 V).

Does any one know how to remove this strange noise please ?

Thanks.