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[* black] The M7 is a NXP LPC18A1. The LPC1800 series are high-performing ARM Cortex-M3 based microcontrollers.
[* icon_note] This [guide|13682|isn't the first time|stepid=46008] we've seen a Cortex-M3 used for motion tracking.
[* black] The M7's job is to combine and process data from the accelerometer, gyroscope, and magnetometer, to produce an absolute orientation of the phone relative to the world. This data is then passed to the A7 in a neat package, probably in the form of 3 headings (roll, pitch, and yaw).
[* black] Offloading this processing task means less work for the A7, which means better battery life, while maintaining constant monitoring of the iPhone's motion.

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