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Rotary and Linear Motion Detection Using the MSP430 Scan Interface and Optical Sensors Application Report The MSP430FW42x Scan Interface module provides an innovative way of detecting rotation and movement without the need for CPU intervention. While the interface was designed with LC and GMR sensors in mind, it is also possible to use the Scan Interface with optical sensors. Complete measurement sequence and the processing of the measurement results are performed by the peripheral module with no CPU intervention.