On 8 June 2012 17:17, Neil wrote: > My mchip FAE had me scope the pins and it seems like it may be overdriven= , > as I'm being told I should have a sine wave, rather than square. =A0See > attached. =A0At another point, I got the partial-sine waveform shown in n= ext > image. =A0In sleep mode, I get the same partial-sine waveform. =A0If this= really > is the issue now, then why is the wake-mode waveform it changing? That really is not good for a crystal oscillator! They're designed to have only a single frequency going through them and not the mess of harmonics which will be present with the square wave you're getting. N.B. crystals are just very high Q filters. My first thought is to try putting some resistance in series with the crystal output pin on the PIC (SOSCO I think) to reduce the crystal's drive level. --=20 Brendan Gillatt http://www.brendangillatt.co.uk --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .