Hi there. I'm trying to use a PIC 16F84A in RC timing mode. I'm using RC rather than a crystal mode because I need a very low input frequency of 480Hz (120 instructions per second). Does anyone have any suggestions as to what values I would need for the resistor and capacitor to be roughly near my target frequency?
f=1/(2*pi*R*C) what value R's or C's do you ave lying around. thats what it pretty much comes too. i'd probably start with a .01 uF cap if you don't have anything, they are common enough. i don't have a calculator handy, so you can do the math (sorry) edit: http://en.wikipedia.org/wiki/RC_time_constant
By that formula, for an R of 10k + 10k pot for tuning + 1k pot for fine tuning, C is roughly 0.022uF. Thanks.
