Hi,
No, you can not produce a PWM signal with a LESS than one cycle - and that's not a PBP limitation. What you can do to make it fade up/down faster is to decrease the number of discrete dutycycles that it "passes thru" by using the STEP directive in the FOR-NEXT loop, like you do when fading down
Code:
For Duty = 0 to 255 STEP 5
   PWM LED_0, Duty, Clycle
NEXT
Or you could increase the oscillator frequency which in turn will increase the frequency generated by the PWM command.

/Henrik.