3.3.3. Binary compatibility with other Cortex processors

The processor implements a binary compatible subset of the instruction set and features provided by other Cortex-M profile processors. You can move software, including system level software, from the Cortex-M3 processor to other Cortex-M profile processors.

To ensure a smooth transition, ARM recommends that code designed to operate on other Cortex-M profile processor architectures obey the following rules and configure the Configuration Control Register (CCR) appropriately:

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