Cortex-R has programmer and exceptional model is same as Classical Series of ARM where as (Small change in Exception processing, Cortex-R makes use of SRS,CPS,RFE for exception entry and exit)Cortex-M ...

In 2004, ARM announced its newest generation of licensable cores, called the "Cortex" family. Cortex cores span a wide range of performance levels, with Cortex M-series cores at the low end, Cortex ...