On Saturday 04 Oct 2003 6:49 pm, you wrote: > so based on your experience, what's the best way to terminate ins and outs > to minimize sleep current ? > That's the problem - it is processor specific. We were using a Zilog part IIRC and the manufacturuer gave us specific advice on each pin. With unused inputs you can only pull them up or down. I would suggest you try each one each way in turn and measure the resultant current. You could post the results here as I am sure there are others who would be interested. One other tip, to reduce current on our project we took advantage of the fact that current draw is dependent on oscillator frequency. We ended up running at about 10KHz and achieved a 5 year life from an alkaline PP3. Ian -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads