MCU Startup Code: What Happens Before main() Runs (ARM Cortex-M Example)
MCU startup code is the low-level code that executes during the early stages of MCU initialization after a reset. On a Cortex-M device, the processor begins the reset sequence by loading the initial Main Stack Pointer (MSP) and the reset handler address from the vector table. Depending on the MCU’s boot architecture, a boot ROM or
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