Does anyone have any experience with Atmel's AT91SAM9 microcontrollers? I'm working with an eval kit for the AT91SAM9XE512 trying to exercise the processor low power modes but am not having much success. More specifically, there is a mode advertisted in the datasheet's electrical characteristics section called "Ultra low power" that purports to draw only 600uA on VDDCORE supply lines. The best I've been able to get is about 1.1mA, plus it takes several seconds to "wake up" to full power operation after I press a button on the eval board that I have configured as an interrupt source. 1.1mA seems too high and a several second wake time seems excessive when I can just reset and reconfigure the processor in under 1 second.
Does anyone have any experience in this arena or know of any good resources for it? Atmel tech support has been slow to respond although they did provide an example project for AT91SAM9261 processors which I ported to the 9XE to no avail.
Thanks in advance!