Discussion
A framing error reported by a UART means that
Answer: D
Correct answer: the stop bit was not found where it was expected
The receiver samples where the stop bit should be and expects to find the line idle. Finding it low instead means the framing assumption has broken - almost always a baud rate mismatch, so that the receiver’s bit clock has drifted out of alignment across the character, but sometimes noise or a break condition. A parity error and an overrun are separate flags reporting separate faults.
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