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to an alias word will set or clear the corresponding bit in the bit-band region. This allows every individual bit in the bit-band region to be directly accessible from a word-aligned address. In particular, individual bits can be set, cleared, or toggled from C/C++ without performing a read-modify-write sequence of instructions. Though the bit-band is optional, it is less common to find a Cortex-M3 and Cortex-M4 microcontroller without it. Some Cortex-M0 and Cortex-M0+ microcontrollers have bit-band.
* Memory Protection Unit (MPU): Provides

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