IIS3DWB has two physical interrupt pins INT1 and INT2, which can be programmed to give physical interrupts to STM32 MCU. You can define threshold of acceleration and you can get interrupt if you are above. You can get interrupt every time new data are present in the output sensor registers. You can also use FIFO related interrupts to have information if FIFO is empty, full or there is certain amount of samples for example for your RMS speed calculation algorithm.
