Author: Mike Johnston

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

Microcontrollers are integrated circuits that contain a processor core, memory, and programmable input/output peripherals. They are used in a wide variety of embedded systems and Internet of Things (IoT) devices. One important consideration when designing products with microcontrollers is power consumption, especially for battery-powered devices. Microcontrollers have various low power modes that allow the device

ARM processors have a large number of registers compared to many other processor architectures. The main reasons for this design choice are to enable more efficient execution of compiled code and to provide flexibility for a wide range of use cases. Compiled Code Efficiency Having more registers available allows compiled code to keep more values

The link register and stack are two important concepts in ARM assembly programming that play different but complementary roles. Understanding the differences between the two is key to effectively utilizing registers and memory in ARM programs. Link Register The link register, also known as LR or R14, is one of the general purpose registers in

The link register in ARM processors is a special register that stores the return address when a function call is made. It enables linking between different parts of a program when jumping between functions and returning back. Understanding the link register is key to low-level programming on ARM devices. Function Calls and the Link Register

The link register in the ARM Cortex-M3 processor is a special register that contains the return address when a function call is made. It allows the processor to return to the instruction after the function call once the function has completed execution. The link register plays a crucial role in handling subroutines and function calls

The ARM Cortex-M and Kirin A1 are two very different processors designed for different use cases. The Cortex-M is designed for embedded and IoT applications while the Kirin A1 is designed for wearables and edge AI. Here is an overview comparison of the key differences between these two ARM-based processors. Intended Use Cases The Cortex-M

The interrupt vector table is a key component in ARM Cortex microcontrollers and processors that allows them to respond quickly and efficiently to events. It provides the processor with the memory addresses of handler or interrupt service routines for different interrupts. When an interrupt occurs, the processor can immediately fetch the corresponding handler address from

The number of available interrupts in ARM Cortex-M3 and Cortex-M4 microcontrollers depends on the specific chip implementation. However, the Cortex-M3 and Cortex-M4 architectures themselves allow for a substantial number of flexible interrupts to support a wide range of applications. In general, the Cortex-M3 and Cortex-M4 microcontrollers have several interrupt sources available to them, including: The

The interrupt vector table in ARM processors is located at the start of memory, beginning at address 0x00000000. This table contains the address of each exception and interrupt handling routine. When an exception or interrupt occurs, the processor jumps to the corresponding address in the vector table to run the appropriate handler. Overview of Interrupts