>Hi, has anyone had trouble using the internal >RC oscillator on the lower PICs, like the 12c508 >or 16c505 ?? > The spec on the 12C508 says "VDD Rise Rate to Ensure Power-on Reset" = 0.05 V/ms at the minimum (or 5V in 100 ms). They wouldn't spec it if they didn't think you could get in trouble with it. Jim Nagy Elm Electronics ICs for Experimenters http://www.elmelectronics.com/ -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.