In SX Microcontrollers, SX/B Compiler and SX-Key Tool, electronic wrote: Hi Gunther, Peter (pjv) and the group You are correct the secret stack instructions popPC/pushPC ($04F/$04B) operate on the interrupt stack. Sorry for this confusion. I made the silly mistake of programing a single DW byte incorrectly !!! My program now functions as required. Many thanks for your valuable help and advice. Best regards electronic ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=162350#m163728 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)