----- Original Message ----- From: Ned Seith > I use 4,700 ohms and 22pF with the 16F84 to produce 4 MHz. with the > oscillator type set to "RC". > > These not-recommended by Microchip values work reliably, reduce cost (vs > crystal) and reduce weight for model airplane receivers. Although they recommend R >= 5k Ohms, if you read the accompanying comments in the data sheet, they say that with R <= 4k the oscillator may become unstable, so 4.7k seems safe enough. Jeff -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics