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Migrating from 8/16-bit MCUs to 32-bit ARMs Slide 17
As just mentioned, the other operating modes provide additional functionality for the ARM core. These additional modes allow for different prioritization of user interfaces or code situations. However, most of the time, the core is in User or System modes. The older 8 or 16 bit processors lack this flexibility.
PTM Published on: 2011-11-02