#3 ARM Cortex M3 : Language assembleur - instructions LDR, STR, ADD, SUB, MUL avec State

   • #1 ARM Cortex M3 : Introduction et explica...      • #2 ARM Cortex M3 : Language assembleur - i...      • #3 ARM Cortex M3 : Language assembleur - i...      • #4 ARM Cortex M3 : Language assembleur - I...      • #5 ARM Cortex M3 : Language assembleur - I...   The ARM Cortex-M3 is a 32-bit processor belonging to the ARM Cortex-M family of microcontrollers. Designed for use in embedded systems, the Cortex-M3 is widely used in a variety of applications, ranging from medical devices to household appliances and industrial controllers. Here is a detailed description of the ARM Cortex-M3 architecture in assembly language: Registers: The Cortex-M3 has several types of registers, including general-purpose registers (R0-R12), special registers (SP - Stack Pointer, LR - Link Register, PC - Program Counter), and status registers (APSR - Application Program Status Register). Execution Modes: The Cortex-M3 supports two main execution modes: Thread mode (for executing user code) and Handler mode (for handling interrupts and exceptions). Instruction Set: The Cortex-M3 instruction set is called the Thumb-2 instruction set. It is a combination of the older Thumb instruction set and the ARM instruction set. Thumb-2 instructions are coded in 16 or 32 bits, offering better code density compared to the classic ARM instruction set. Memory Access: The Cortex-M3 uses a two-level memory access model with memory addresses ranging from 0x00000000 to 0xFFFFFFFF. It supports memory access using instructions such as LDR (Load Register), STR (Store Register), LDM (Load Multiple), and STM (Store Multiple). Interrupt Handling: The Cortex-M3 uses an interrupt and exception handling mechanism. It has interrupt vectors, where each vector points to a specific handling routine. When an interrupt occurs, the processor automatically switches to the corresponding handling routine. Power Saving Modes: The Cortex-M3 supports various power saving modes to minimize power consumption when a system is not actively used. These modes include Sleep mode and Deep Sleep mode. Keil µVision 4 is a widely used integrated development environment (IDE) for programming microcontrollers. However, it is not available in French as a primary language. The user interfaces of most development tools, including Keil µVision, are generally available in English.