hard20 pts · first answer countsmicrocontrollersclocks

External crystal fails in the field

A product runs from an external crystal through the PLL. If the crystal stops working, the MCU halts. Which STM32 feature lets it keep running safely?

A.The brown-out reset, which restarts the chip on the HSE againB.The clock security system: it switches to HSI and fires an NMIC.The window watchdog, which keeps the PLL running by itselfD.Flash read protection, which locks the current clock settings

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External crystal fails in the field

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