Q. Find the control word for PA= out, PB= in, PCL=out, PCH=out (Mode0)?

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. DS12887 is a

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. What are DPDT relays?

View solution

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

View solution

Q. Why are solid relays advantageous over electromagnetic relays?

View solution