Arm

The Cortex-M4 processor from ARM is a very popular 32-bit microcontroller that is widely used in embedded systems and IoT devices. It has a simplified integer pipeline compared to high-performance application processors, optimized for low-power operation. At the core of the Cortex-M4 is the AMBA 3 AHB-Lite bus interface, nested vectored interrupt controller, and memory…

The xPSR (program status register) is one of the key registers in the ARM Cortex-M processor that contains status information about the processor state. It provides details on the current state of the application program being executed as well as the result of the previously executed instruction. The ‘x’ in xPSR stands for ‘extended’ as…

The Cortex Microcontroller Software Interface Standard (CMSIS) is a vendor-independent hardware abstraction layer for microcontrollers based on Arm Cortex cores. It aims to simplify software re-use across different vendors and microcontroller families. CMSIS provides a common software framework with standardized interfaces and enables easy porting of software between different Arm Cortex-M based microcontrollers. Disadvantages of…

The Common Microcontroller Software Interface Standard (CMSIS) is a vendor-independent hardware abstraction layer for microcontrollers based on Arm Cortex processors. It defines interfaces and design methods that provide a common software framework to all Cortex-M processor vendors. CMSIS enables consistent and simple software interfaces to the processor and the peripherals, simplifying software reuse and reducing…

ARM Cortex-M processors are extremely popular and widely used in embedded systems due to their power efficiency, performance, and cost effectiveness. Here are some of the key reasons why Cortex-M processors are so important for embedded applications: Power Efficiency Power efficiency is a critical requirement in many embedded systems, especially battery-powered devices. Cortex-M processors are…

The ARM Cortex-M4 processor includes features like the Memory Protection Unit (MPU) and write buffer which can improve performance and reliability of embedded systems. However, care must be taken when using the write buffer with MPU enabled to avoid issues. This article provides an overview of the write buffer, MPU, and considerations when using them…

A watchdog timer (WDT) is a hardware timing circuit that is used to detect system anomalies and reset the microcontroller or microprocessor if any occur. It is an essential component of many embedded systems, providing an extra layer of robustness and reliability. The main purpose of a WDT is to reset the system if the…

A watchdog timer (sometimes called a watchdog or just watchdog) is an electronic timer that is used to detect and recover from computer malfunctions in programmable logic controllers (PLCs). The watchdog timer resets itself periodically and triggers a system reset if it is not reset before the time interval lapses. This helps improve the reliability…

A watchdog timer (WDT) is a hardware circuit that is used to detect anomalies and reset the microcontroller if it stops functioning correctly. It is an essential component for building robust and reliable embedded systems. Why use a watchdog? Microcontrollers are susceptible to lockups and crashes due to software bugs, electrical noises, power glitches, etc….

Watchdog software refers to programs that monitor the status of key system components and take action when issues are detected. The term ‘watchdog’ comes from the idea that these programs keep a watchful eye to identify problems. Watchdog software serves an important role in maintaining system stability, preventing data loss, and reducing downtime. Monitoring System…