Smooth LED fading via PWM

[HankMcSpank]

Just going off tack a little (still intend breadboarding this up so I can easily inster leds to suit - but for now stuck with my PCB).

I want the PIC pins to sink surrent, therefore I rejigged everything to have all the LED cathodes pointing at the pin, with all the anodes commoned and a P channel mosfet switching 3.2V to the anodes (via HPWM on the mosfet gate).

Something took me aback a little, with a duty value of 255, my leds were still *just* lit (remember we are talking reverse now, so a value of 255 is essentially 0), I changed the duty value to 256 & then the leds switched off ...therefore for all I thought I was using 8 bit/256 values (PR2=63 @8Mhhz, no pre/post ) I was actually using 257 values (and therefore a value 0f 255 sorta equalled 1)...this sucks cos obviously 257th value needs 9 bits! Now I know 255 is almost 256 so as not to worry that much....but is there any way of setting up the HPWM so that 100% duty = 255 exactly?

(BTW I've since inverted the PIC's HPWM ouput so now a value of 0 = the supply voltage & 255 = 0, which has solved my problem of the LEDs not totally extinguishing at a value of 255)