Cortex M23 vs M0+

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M23 core is an improvement of M0+ core, for official comparison se here.
Below there is a quick comparison.

Key features of the Arm® Cortex®-M23 core (form ARM web page)

  • Cortex-M23 is an implementation of the ARMv8-M architecture. Full details here.
  • Using the same debug interface as the other Cortex-M processors.
  • Offering the optional micro trace buffer, wake up interrupt controller and fast I/O bus as the Cortex-M0+
  • Using the AHB5 specification for the system and memory interface to extend security to the whole system
  • Using the latest version of the memory protection specification to simply the setup of regions
  • Extends the number of maximum interrupts to 240
  • An optional embedded trace macro cell to expand the trace functionality
  • Updated debug components that enhance debug operations and simplify usage
  • Exclusive memory access instructions to simplify multi-core designs
  • Instructions for divide operations to boost performance
  • Stack limit checking in hardware when security is implemented
  • TrustZone for software and hardware isolation