>See code above and I powered the chip with a 9V nicad for 8 hours with no >problem. Also TMR1 is specifically designed to wake the chip from SLEEP on I'm not sure about the calcs, but a $.55 Lithium coin cell (220mAh) at 3V could keep the RTC running at 3uA for about 8 years. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads