In SX Microcontrollers, SX/B Compiler and SX-Key Tool, dkemppai wrote: [quote="stef"] Dan, I added the 5pFcap to the OSC2 and am now testing for almost 1 hour on the resonator without any problems. Thanks for this advice. Can somebody explain me why this?? Can I assume that I may add a resistor of 10K parallel on osc1 and osc2 and the cap of 5 pF to Osc2 always to my pcb's. It is not hard to do if needed but dous it harm. I 'm now running stable and hope to keep it like that. Not exactly sure why it works, but it fixes startup problems for me with resonators as VDD < 5 volts. On my boards, I use very tight traces, that are well balanced. What I've found is a lot of the SX's don't like starting without that cap. I think it has to do with changing the phase shift/delay between the osc1 and osc2 pins. It helps the startup, and helps keep the osc running... A lot of times I just solder a 603 size 5pF on top of the SMD resonators... Glad it worked! -Dan ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=263075#m263406 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)