Using 16f57 for ultra low cost, I can't get the external rc oscillator to w=
ork
at all. I can inject clock and CLK2 outputs CLK1/4, but connecting a pullup
between 2k2 and 10k to CLK1 simply pulls it high and nothing interesting ev=
er
happens. There is no table for RC selection in the datasheet of the 16f57. =
I
could find nothing relevant in the microchip.com search engine. Can someone
please point me to a table or other data set which clarifies the rc compone=
nt
limits for modern 16f57s? And other pics?

My current option seems to be trial and error. C is 47pF ceramic for now. F
should be about 1MHz with 10k and 47pF, no? I mean, from plain RC circuit t=
heory.

thanks,

  Peter

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