In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: The interrupt is triggered when RTCC "rolls over" from 255 to 0. So you will need to set RTCC to 255 in the setup code and in the interrupt code. Bean. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=206380#m206414 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)