Author: Elijah Erickson

The Cortex-M3 is an ARM processor core designed for microcontroller applications. One of its key features is support for multitasking through preemptive context switching. This allows multiple tasks or threads to share the M3 core by rapidly switching between their execution contexts. What is Context Switching? Context switching refers to the saving and restoring of

The Cortex-M3 is a 32-bit RISC processor designed by ARM to provide high performance and low power consumption for embedded applications. It has a 3-stage integer pipeline and a 2-stage memory pipeline to optimize instruction throughput. 3-Stage Integer Pipeline The 3 stages of the Cortex-M3 integer pipeline are: Fetch Stage In the fetch stage, the

The Cortex-M processor implements a scheme called “priority masking” to prevent lower priority interrupts from interrupting higher priority code sequences. This is achieved by setting the BASEPRI register to mask interrupts below a certain priority level. For example, setting BASEPRI to 16 prevents interrupts with priority lower than 16 from triggering. This allows critical sections

An ISB (Instruction Synchronization Barrier) is needed after a WFI (Wait For Interrupt) instruction in Cortex-M based microcontrollers running FreeRTOS to ensure proper synchronization between the FreeRTOS scheduler and interrupt handling. The key reason is that the Cortex-M processor may speculatively fetch instructions ahead of the current instruction stream, which can lead to race conditions

The ARM Cortex-R4 is a 32-bit RISC processor core designed by ARM Holdings. It is part of the Cortex-R series of ARM processor cores intended for real-time embedded applications that require high performance and reliability. Overview The Cortex-R4 core is based on the ARMv7-R architecture which includes features designed specifically for real-time applications like fast

The ARM Cortex M0 is a 32-bit RISC processor core designed for microcontroller applications. It is the smallest and most basic member of the Cortex-M family of cores. The Cortex M0 memory map defines how memory is organized and accessed on Cortex M0 based microcontrollers. Cortex M0 Memory Organization The Cortex M0 has a simple,

The short answer is no, the ARM Cortex-M3 processor does not have cache. The Cortex-M3 is part of ARM’s Cortex-M series which are low-power microcontrollers meant for embedded applications. The M3 and other Cortex-M chips emphasize power efficiency and deterministic real-time behavior over raw performance, so they omit cache and other performance-boosting features common in

The cache in ARM Cortex processors is a small, fast memory that stores copies of frequently used data and instructions from the main memory. The cache improves performance by reducing the number of accesses to the slower main memory. When the processor needs data or instructions, it first checks the cache, and if the required

The STM32F407G is a high-performance microcontroller from STMicroelectronics based on the ARM Cortex-M4 core. It offers a balance of processing power, peripheral set, speed, and power consumption making it suitable for a wide range of embedded applications. Overview The STM32F407G has the following key features: With its Cortex-M4 core, the STM32F407G offers digital signal processing

The STM32F407 is an ARM Cortex-M4 based microcontroller from STMicroelectronics. It has 192 KB of RAM available for code and data storage during runtime operations. Overview of STM32F407 The STM32F407 is part of STMicroelectronics’ F4 series of high-performance microcontrollers based on the ARM Cortex-M4 core. The F4 series combines high computing power with low power