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Which of the following signals are active low in the 8250 UART?

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Which of the following signals are active low in the 8250 UART?

(a) BAUDOUT

(b) DDIS

(c) INTR

(d) MR

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I would like to ask this question from UART in section Basic Peripherals of Embedded Systems

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Correct option is (a) BAUDOUT

Easy explanation: The BAUDOUT signal is active low whereas DDIS, INTR and MR are active high in the 8250 UART. BAUDOUT is the clock signal from the transmitter part of the UART. DDIS signal goes low when the CPU is reading data from the UART. INTR is the interrupt pin. MR is the master reset pin.

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