hard20 pts · first answer countsmicrocontrollerscortex-minterrupts

Stack frame with FPU context

On a Cortex-M4F, an interrupt arrives while the interrupted code was using the FPU. How big is the hardware-stacked frame?

A.26 words: 8 core registers, S0–S15, FPSCR and a reserved wordB.8 words, exactly the same as a frame without the FPUC.16 words: only the FPU registers S0–S15 are stackedD.50 words: every core register and every FPU register

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Stack frame with FPU context

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