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Which of the following is a general purpose I/O pin?

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Which of the following is a general purpose I/O pin?

(a) OUT1

(b) RD

(c) ADS

(d) MR

I have been asked this question in exam.

The query is from UART-2 topic in chapter Basic Peripherals of Embedded Systems

1 Answer

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Best answer
Right answer is (a) OUT1

Easy explanation: There are two general purposes I/O pin OUT1 and OUT2. OUT1 is set by the programming bit 2 of the MCR to a ‘1’ whereas OUT2 is set by the programming bit 3 of the MCR to ‘1’. These are active low pins in 8250.

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