EVK1100 PWM freq 66Mhz

Hi,
I am a complete novice in this field of uc programming and am still 
learning the ropes of it. I am working with an EVK1100 board and 
programming with AVR32 Studio Ver. 2.5
I have to generate a PWM signal with a frequency of 66 Mhz. I have 
already tried using the built in Example program in AVR32 studio i.e. 
EVK1100-Drivers-PWM example.
It is working fine and I am able to manipulate the recieved signal by 
changing the value of Channel prescaler and the channel period in the 
main c program. But the minimum value of the prescaler that I can apply 
is 2 else it is giving me an error. Also the values of the period and 
duty cycle are 2 & 1 respectively (Have attached a screenshot of the 
same). I am observing the output at LED 7. The max freq I get with this 
is 28kHz. Is it possible to get a PWM output of 66Mhz with this 
configuration? Is an external clock signal required for the same? What 
can I further modify in the program?
Please help...