----- Original Message ----- From: "Jan-Erik Soderholm" To: Sent: Tuesday, February 08, 2005 4:53 AM Subject: RE: [PIC:] INTOSC Stability with 16F88 > michael brown wrote : > > > I've recently started using the internal oscillator to run my 16F88... > > > While overall the INTOSC stays within it's 1% spec, in the short > > run the frequency (2MHz CLKOUT) varies by several kHz continuously. > > Hi. > > +/- 1% out of 2 Mhz is +/- 20 KHz, right ? Isn't "several kHz" well > withing the +/- 20 KHz limits ? Yes, but given the numbers I see on the frequency counter, the oscillator may well be jumping far outside it's specs in the short term. I wish I could sample it for 1S and see how jittery it really is. I'm using a 1S gate time and consecutive readings might be <300Hz apart, or they may be >3KHz apart. I realize this is "within spec", but it's not what I expected to see. > I have never seen any specs about the stability over *time*, > only over *temp* (and voltage maybe ?)... > > Now, if this is "normal", I have no idea, but is't clearly withing > the specs in the data sheet, not ? -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist