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Which of the following is a general purpose I/O pin?(a) OUT1(b) RD(c) ADS(d) MRI have been asked this question in exam.The query is from UART-2 topic in chapter Basic Peripherals of Embedded Systems

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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