Posted on May 17, 2011 at 12:08Two problems. One, I have to reinitialize all the peripherals and I have to play games with the startup code to allow some variables to not be initialized after the reset occurs. Second, the signal I need to use to wake the processor is a square wave, which means I'll have to add a one shot or something to shorten the reset pulse. It's actually a real pain, and one that would be easily avoided if the power down mode could be terminated by an external interrupt. Why bother having all the SFRs retain their values during power down mode if you're going to have to reset them anyway? I understand the I/O ports, but the rest of them are lost after the reset. Are the values on the I/O ports lost when the reset occurs?
