Quote Originally Posted by Darrel Taylor View Post

Also, DO NOT enter sleep mode when using USB.
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So what your saying is I can't have the MCU in SLEEP mode and wake it up with an intterrupt when the USB cable is connected? Unfortunately, that is exactly what we wanted to do to save battery power on our application. It is only going to have someone plug a USB cable into it once per month and we wanted to have the MCU sleep except for about 1 minute at midnight each night and also when it then sees a USB cable plug-in once per month. Keeping it awake all the time to accomadate a possible USB connection will not meet our battery life requirements.
Is there any way to save power consumption by the embedded processing application when a USB cable is not plugged in???