|ARM Technical Support Knowledge Articles|
Applies to: Cortex-M3
The Cortex-M3 processor supports only the Thumb-2 instruction set. Since traditional Thumb instructions are included as part of the Thumb-2 instruction set, it supports Thumb instructions as well. The ARM instruction set is not supported; hence, code written for earlier cores running in ARM state will not work on the Cortex-M3.
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