I am trying to make a slot car timing system and I am using a 16f84a. I have already set it up to do the timing using the internal interupts but it is not 100% accurate, it is close (about 1 second per min off). I set the prescaler at 8 and load the tmro with 131 to give 1 sec on paper but it is a bit slow. I can adjust for it in the software but I was wondering if the caps I put on the external clock have anything to do with it. I wanted .22pf just as the schematics said but could not find any so I used .20pf ( I am not quite sure of the exact difference but I know I was close). Any way I was wondering if the clock depended on a R/C circuit or if the caps were only there for filtering.
Any help would be apreciated and sorry for the spelling.
Snap