🤔 Why Is RAM Access Slower Than CPU Registers in ARM Microcontrollers?
CPU registers are located inside the processor core . RAM is located outside the CPU core . So accessing RAM requires: address generation bus access memory read/write cycles But registers can be accessed almost instantly by the CPU. That is why CPUs first load data into registers before processing. 👉 Faster register access = better execution speed. This is also why: repeated memory access slows firmware efficient register usage improves performance compilers try to keep frequently used variables in registers Understanding this helps in: firmware optimization driver development assembly understanding performance tuning Small low-level concept. Huge embedded impact. #TheWhySeries #EmbeddedSystems #Firmware #ARM #Microcontrollers #EmbeddedC