>You might check out the 16f84 data sheet:
> http://ww1.microchip.com/downloads/en/devicedoc/35007b.pdf
>
> The figures 10-7, 10-8, and 10-9 give graphs of RC oscillator

I put some numbers to that

http://home.clear.net.nz/pages/joecolquitt/0f84rc.html

High-speed RC is easily reliable, too many influences that need time
to correct. Time better spent going to the crystal shop

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