Hi folks, I am sending a 12F629 to SLEEP , and supposedly wakes up through an interrupt in one of the i/o ports. It uses the internal RC oscillator. I am trying to measure elapsed time between when i/o port changes and one of the instruccions in the interrupt routine, but the data in the data sheet applies only to XT, HS and LP oscillators. Can somebody inform me if the 1024 cycles Tost are also appliable to internal oscillator ? Has somebody measured the number of cycles it takes for the processor to start working normally in this case ? Thanks Luis A. Loeff -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist