32-bit: https://developer.arm.com/products/architecture/cpu-architecture/m-profile/docs/100688/latest/an-introduction-to-the-armv8-m-architecture https://devel

32-bit: https://developer.arm.com/products/architecture/cpu-architecture/m-profile/docs/100688/latest/an-introduction-to-the-armv8-m-architecture https://developer.arm.com/products/architecture/cpu-architec... >Although the ARMv8-M architecture is 32-bit, it also supports data types of various sizes such as 8-bit and 16-bit. ARMv8-M also supports a limited set of 64-bit operations. It looks like it still uses the 'Thumb' instruction set, which combines 16- and 32-bit instructions in an attempt to balance code size and operation complexity.