Steve Smith wrote: > Tmr2 for the > 20Ms tick to drive the main calling loop You'd have to run the PIC from a **very** slow clock to get timer 2 down to that period. Then you'd have to wait a few weeks to verify it's working. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .