Arm

The Memory Protection Unit (MPU) in ARM Cortex processors provides memory access control to ensure that software accesses only the memory regions it is permitted to. The MPU defines regions of memory and assigns access permissions to each region to control which software can access that region for read, write, or execute operations. Overview of…

The ARM Cortex-M3 is a 32-bit processor core that is widely used in embedded systems and IoT devices. Its memory layout is optimized for high performance and low power consumption. The Cortex-M3 has a Von Neumann architecture with a unified address space for both code and data. This article provides an overview of the different…

A memory map refers to the layout and organization of memory in a computing system. In ARM processors, the memory map defines different memory regions and what they are used for. Understanding the ARM memory map is important for programmers to properly utilize memory and avoid conflicts. Overview of ARM Memory Map The ARM memory…

The Arm Cortex-M4 is a popular 32-bit processor designed for embedded applications. It is based on the Armv7-M architecture and features a 3-stage pipeline, Memory Protection Unit, Floating Point Unit, and optional DSP instructions. Like any complex processor, the Cortex-M4 is susceptible to lockups under certain conditions. This article will examine the potential causes and…

LR stands for “Link Register” and is a special register used by ARM processors for function calls and returns. The LR register contains the return address when a function call is made. When a function finishes executing, the LR is used to return to the instruction after the function was called. Function Calls in ARM…

Core lockup refers to a situation where a CPU core enters an unrecoverable stuck state and stops functioning correctly. This can happen due to bugs in the CPU design or firmware, unanticipated hardware conditions, or software errors. A core lockup causes the affected core to stop responding to interrupts and executing instructions, rendering it unusable…

ARM processors utilize load and store instructions to move data between the processor and memory. The two main instructions for this are LDR and STR. LDR – Load Register The LDR instruction loads a word or byte from memory into a register. Its general syntax is: LDR Rd, [Rn, #offset] Where: For example: LDR R1,…

LDR is an ARM assembly language instruction that stands for “LoaD Register”. It is used to load a value from memory into a register. The LDR instruction copies the contents located at a specified memory address into a destination register. ARM Registers ARM processors contain general purpose registers that are used to store data and…

When it comes to low power consumption, ARM processors are among the leaders in the industry. The ARM architecture is designed to provide high performance and efficiency, making ARM chips ideal for battery-powered and embedded devices where energy usage needs to be minimized. Over the years, ARM and its partners have continued to push the…

The ARM Cortex-M4 processor offers various low power modes to reduce power consumption during periods of inactivity. By leveraging these low power modes, Cortex-M4 based microcontrollers can operate for extended periods on battery power. The main low power modes available in Cortex-M4 are Sleep, Deep Sleep, and Stop modes. Sleep Mode Sleep mode is the…