Hello.
Yes, it is (depending on how high the frequencies need to be). Typically you would use a timer event and switch a pin (or pins) on the timer. See:
http://www.matrixmultimedia.com/mmforum ... 659#p51659
This is a squarewave generator component. You can export the component from the source file and include the component in your own projects.
if you need high frequencies then you may need to do this in a timer interrupt during simulation.
Cheers,
Jonny