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Forum Post: MSP430F5529: USB fails to enumerate when exiting LPM2

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Part Number: MSP430F5529 Hi, I have a battery powered product here that goes into LPM2 sleep mode and wakes up once a minute then goes back to sleep. The device is fitted with a USB connector and I have a VUSB_On interrupt into my software stack. Upon connection of the USB the interrupt is triggered, device wakes up and exits Low Lower Mode. The problem exists that the USB will fail to enumerate until you 'get lucky' after the 3rd or so USB connection attempt. Does anyone have any suggestions on the best approach for exiting LPM on a USB connection?. I figure the MSP430 will take some time to startup again and get the clocks going, which possibly violates the USB requirement for enumeration. Thanks Stomp!

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