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In DS12887, which out of the following is correct about the SQW pin?

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In DS12887, which out of the following is correct about the SQW pin?

(a) it is an output pin

(b) it can provide up to 15 different square waves

(c) the frequency of the square wave is set by the register A

(d) all of the mentioned are correct

The question was posed to me in an internship interview.

Enquiry is from Interfacing with RTC topic in portion 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
The correct answer is (d) all of the mentioned are correct

For explanation I would say: In DS12887, SQW pin stands for SQuare Wave. It is an output pin that can provide us with 15 different square waves. The frequency of the square wave is selected by programming register A.

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