Hi Dietmar, I roughly measured wakeup time from LPM0/1 and 4 with/without full-performance mode. The code is attached. MSP430F5438A . (Please visit the site to view this file) Ch1: toggled in ISR Ch2: external interrupt (falling edge) LPM0 with fast wakeup LPM0 with slow wakeup LPM1 with slow wakeup LPM1 with fast wakeup LPM4 with slow wakeup LPM4 with fast wakeup As you can see below waveform, wakeup from LPM0 is ~15usec regardless of PMM configuration. Wakeup form LPM1 also independent from PMM configuration, but it is a bit longer (~60usec). Wakeup form LPM4 depends on PMM configuration and ~60usec with fast wakeup, ~200usec with slow wakeup. I will investigate it further. Thanks and regards, KoT
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