Arm

The Cortex-M4 is a 32-bit ARM processor core designed for embedded and IoT applications. It is part of ARM’s Cortex-M series of processor cores, which are optimized for low power consumption and high performance in microcontroller and other resource-constrained devices. The amount of memory available on a Cortex-M4 based microcontroller can vary significantly depending on…

The Cortex-M4 processor includes a single precision floating point unit (FPU) that can significantly improve performance for applications using floating point math. However, the FPU is disabled by default and must be explicitly enabled before it can be used. This article provides a step-by-step guide on how to enable the FPU in Cortex-M4 based microcontrollers….

The FPU (Floating Point Unit) in Cortex-M4 is a hardware unit that provides support for floating point arithmetic operations. It allows the Cortex-M4 processor to efficiently perform mathematical calculations involving floating point numbers. Overview of Floating Point Numbers Floating point numbers are used to represent real numbers in computing. They allow a wide range of…

The short answer is yes, the Arm Cortex-M4 processor core does contain an FPU (Floating Point Unit). The Cortex-M4 FPU represents a major upgrade over previous Cortex-M cores, allowing much higher performance on floating point arithmetic operations. Overview of Arm Cortex-M4 The Arm Cortex-M4 is a 32-bit processor core designed for microcontroller applications. It is…

The Arm Cortex-M4 processor is a popular 32-bit microcontroller core used in a wide range of embedded systems. As with any complex processor design, the Cortex-M4 has had some issues discovered after release, documented in official errata notices from Arm. While most of these are minor bugs, some can cause problems in certain applications, so…

The stack pointer in the ARM Cortex-M4 is a register that points to the top of the stack memory. It indicates where the next push or pop operation will take place. The stack grows downwards in memory, so the stack pointer holds the address of the last stacked item. It is decremented when pushing to…

The Cortex-M4 processor handles exceptions and interrupts using vector numbers. A vector number is assigned to each type of exception and allows the processor to quickly branch to the specific exception handler when an exception occurs. The vector numbers are useful for configuring the processor’s Nested Vectored Interrupt Controller (NVIC) and for writing exception handler…

The ARM Cortex exception stack frame is the region of memory used by the processor to store context information when an exception occurs. The stack frame allows the processor to save the current state of execution, handle the exception, and then return to where it left off after the exception has been resolved. Overview of…

Exceptions are events that disrupt the normal flow of instruction execution in a processor. They can be triggered by various conditions like illegal instructions, division by zero, memory access violations, interrupts etc. Handling exceptions properly is critical for robust and secure system operation. The ARM processors have a well-defined exception model to handle such events…

The ARM Cortex Microcontroller has an advanced interrupt controller called the Nested Vectored Interrupt Controller (NVIC) that provides low latency interrupt processing and efficient prioritized interrupts. The NVIC handles all the interrupts for the processor and allows for efficient management of multiple simultaneous interrupt requests. Overview of NVIC The NVIC replaces the traditional single level…