> ... apparently syncing the primary and secondary clocks work In my original reply I wrote - "The datasheet recommends stopping the timer if it's asynchronous with the main ocillator before writing" Knowing what you know now, does that fit in with your solution ? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .