Thanks!

And here some help for others on how its solved:


Mister E's multi-calc outputs the following for the 8MHz oscillator when we want a 455khz pwm:

500,0 KHz prescaler1:1 PR2=3 6 Bit resolution

we want the pwm to be a bit slower so:

455/500= 0.91

0.91x8MHz = 7,28MHz