> So, would clearing TMR1L make sure it won't roll over Keeping TMR1L at 0x00 would definitely stop it rolling over ;-)) > or do I just make sure I load TMR1H right after it has rolled > over, so TMR1L doesn't have time to roll over? Yes. TMR1L will keep incrementing in the background -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist