Q. What are optoisolators?

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Q. Why are solid relays advantageous over electromagnetic relays?

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Q. Why do we need a ULN2803 in driving a relay?

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Q. What are DPDT relays?

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Q. What is the principle on which electromagnetic relays operate?

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Q. What is the supply that a DS12887 consumes even when the power is switched off?

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Q. Name the read only registers are present in the DS12887?

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Q. Are the RAM locations of the DS12887 non volatile?

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Q. What is the byte address where time, calendar, alarm address locations etc are kept?

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Q. What is correct about the UIP pin of the register A?

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Q. Which out of the following is correct about the SQW pin?

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Q. Which bits of the Register A are used for turning on the oscillator?

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Q. How many bytes of the ROM are there for the general purpose applications?

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Q. What is the RAM space that a DS12887 have?

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Q. DS12887 is a

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Q. How many pins of the 8255 can be used as the I/O ports?

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Q. What is correct about the BSR mode from below?

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Q. Why MOVX instruction is being used to access the ports of the 8255?

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Q. What is the value of the control register when RESET button is set to zero?

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Q. Which pins are used to select the ports and the control register?

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