![]() ![]() Memory Protection Unit (MPU): Provides support for protecting regions of memory through enforcing privilege and access rules.Some Cortex-M0 and Cortex-M0+ microcontrollers have bit-band. ![]() Though the bit-band is optional, it is less common to find a Cortex-M3 and Cortex-M4 microcontroller without it. In particular, individual bits can be set, cleared, or toggled from C/C++ without performing a read-modify-write sequence of instructions. This allows every individual bit in the bit-band region to be directly accessible from a word-aligned address. For example, writing to an alias word will set or clear the corresponding bit in the bit-band region. Bit-Band: Maps a complete word of memory onto a single bit in the bit-band region.If a Cortex-M33 microcontroller has the Security Extension option, then it has two SysTicks, one Secure and one Non-secure. Though the SysTick timer is optional, it is very rare to find a Cortex-M microcontroller without it. When present, it also provides an additional configurable priority SysTick interrupt. SysTick timer: A 24-bit system timer that extends the functionality of both the processor and the Nested Vectored Interrupt Controller (NVIC).Some of the silicon options for the Cortex-M cores are:
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