What are the different operational modes of Arm Cortex-M0/3/4 Processor ?

The Arm Cortex-M0, M3 and M4 processor has two operational modes.

These modes include Thread mode, Handler mode. In Thread mode which also called as "User Mode", the processor executes application code either with or without access to the processor full resources, which also called as the access level, we are going to talk about the different access levels in a separate article. The handler mode is reserved for handling exceptions and interrupts, ensuring timely response to system events and it executes the ISR (Interrupt Service Routine) with the access to the processor full resources . These operational modes empower developers to optimize performance, security, and resource utilization in embedded systems powered by Cortex-M0, M3, and M4 processors.

Written By: Musaab Taha