Hi all, 1) At first, I apologize about my piclist newbie question. I have post 2 messages to the list yesterday. Today, I have not seen theses messages appearing in the list. But, a piclist member thanks me about one of theses messages (quoted inside his reply). Can't understand. :-() 2) I repost these questions : I use the sleep instruction for the first time on a picmaster with 17C44 probe, external clock mode. a) Sleep intruction simply does not work. Where I am wrong ? b) Is sleep mode work with external clock ? Friendly regards, stephane riviere, Oleron Island - France.