> http://www.arm.com/files/pdf/cortex_m23_and_cortex_m33.pdf
>
> tldr: m23 is an m0+ follow-on and m33 is an m3/m4 follow-on with
> configurable dsp and floating point options. Both have TrustZone. The
> m33 gives 20% performance boost to the m3/m4 (wonder what happened to
> the m7) while the m23 adds TrustZone to the m0+.
http://www.arm.com/files/pdf/cortex_m23_and_cortex_m33.pdf
tldr: m23 is an m0+ follow-on and m33 is an m3/m4 follow-on with
configurable dsp and floating point options. Both have TrustZone. The
m33 gives 20% performance boost to the m3/m4 (wonder what happened to
the m7) while the m23 adds TrustZone to the m0+.