Author: Ryan Ryan

When an ARM-based microcontroller powers on or resets, the processor begins executing instructions from a specific memory address. The code located at this address is known as the startup code or boot code. The primary job of the startup code is to initialize the processor, memory, and any peripherals so that the main application code

When the reset is executed on an ARM Cortex-M based microcontroller, the processor will restart and reload the program counter to the start of the code memory. This resets the entire state of the microcontroller including all registers, peripherals, and program flow. The reset reinitializes the device to its power-on state. Detailed Reset Sequence Here

The Cortex-M4 processor from ARM has support for up to 256 different priority levels for interrupts and exception handling. This allows for very flexible and customizable prioritization of different events and exceptions in the system. Having many priority levels allows software developers to carefully organize and structure their interrupt service routines (ISRs) based on the

A non-maskable interrupt (NMI) in ARM is a hardware interrupt that cannot be ignored or disabled by software. It is typically used to signal critical system errors that require immediate attention from the processor. NMIs have the highest priority among all interrupts in ARM systems. Overview of Interrupts in ARM Interrupts allow external events to

The quick answer is that you can disable interrupt nesting in ARM Cortex M0+ by setting the PRIGROUP field in the Application Interrupt and Reset Control Register (AIRCR) to 111b. This will make all interrupts have the same priority level, preventing any nested interrupts. Introduction to Interrupt Nesting Interrupt nesting refers to the ability of

The MMU, or Memory Management Unit, is a component in computer systems that manages memory accesses and translates virtual memory addresses to physical memory addresses. Its main purpose is to provide memory protection, virtual memory support, and page swapping capabilities to allow for efficient and safe memory management. Memory Protection One of the key functions

The MMU, which stands for Memory Management Unit, is a component in CPUs that handles memory access and management. Its main functions are to translate virtual addresses to physical addresses through paging and segmentation, allocate memory dynamically to programs, and protect memory spaces from unauthorized access. Address Translation One of the primary functions of the

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 size of a register in ARM depends on the specific ARM architecture being used. ARM has evolved over the years with different versions and implementations that utilize registers of different bit widths. In general, the size of a register in ARM can be 8-bit, 16-bit, 32-bit, or 64-bit depending on the architecture variant. The