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Migrating from 8/16-bit MCUs to 32-bit ARMs Slide 28
In addition to the thumb or ARM state, it is important to keep in mind which mode the ARM core is operating in. As can be seen in this slide, in modes other than user and system, the higher registers are used for special purposes. So in the cases of certain interrupts it’s important to be aware of the limited availability to these higher registers.
PTM Published on: 2011-11-02