I'm working on a PID regulator for a speed motor controller :p

I'm planing to capture with CCP2 the period from a 9 pulses per revolution
encoder.
I can't use other encoder than this!
In order to display in RPM I use this algorithm:

     RPM = F * 60 / 9
since F = 1 / t(Period)

     RPM = 60M / t(us) / 9

or
     RPM = 6666666 / t(us)

is there a simplest method?

Thanks in advance.
Dennis.

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