Hi Dwayne,
no i test with an 4 MHZ. If you use an 8 MHZ clock results will maybe double. i didn't test but in the manual they says : 4MHZ return 10uSec increment and 20MHZ 2uSec increment. So i figure that 8Mhz will be close to 5Usec increment.

since i never use Rctime, as i see RCtime can be use to read charge and discharge of capacitor. Not really 1/2 Pulsin in your case.

see this :
http://stage.itp.tsoa.nyu.edu/~tigoe...s/000494.shtml

and this is an other definition of RCtime

http://www.mikroelektronika.co.yu/en...book/04_03.htm

regards