Quiz 4

In AVR, which registers are there for the I/O programming of ports?

• PORT

• PIN

• DDR

• All of the mentioned

The data will not go from the port registers to the pin unless:

• DDR register of that port is set to 0

• PORT register of that port is set to 1

• DDR register of that port is set to 1

• PORT register of that port is set to 0

On reset DDR registers of all ports are set to:

• 0

• 1

• 0 and 1

• None of the mentioned

Which of the following statements are correct?

• PIN register of a port is used to bring data into CPU from pins

• PORT register is used to send data out to pins

• DDR register is used to control the direction of a port

• All of the mentioned

In the AVR family, all I/O ports have 8 pins?

• true

• false

• none of the mentioned

• can’t be determined

CP instruction alters the value of the register?

• true

• false

• none of the mentioned

• can’t be said

Which of the following is correct about the MUL instruction?

• (a) it is a byte-by-byte multiplication instruction

• (b) the product is stored in two registers R1 and R0

• (c) both (a) and (b)

• none of the mentioned

What steps are involved when we subtract two numbers present at two different locations?

• (a) take the two’s complement of the subtrahend

• (b) add it to the minuend

• (c) invert the carry

• (d) Both a and b

• (e) a, b and c

To make Port C an output port, we must place ___ in register ___

• 0 in DDRC

• 1 in Port C

• 1 in DDRC

• 0 in Port C

LXI R16, $FF

OUT DDRB

OUT DDRD

LXI R16,0

OUT DDRC

IN R20, PINC

OUT PORTD, R20

What is the program doing?

• Reading data from Port C and sending to Port D

• Reading data from Port D and sending to Port C

• Reading data from Port C and sending to Port B

• Reading data from Port B and sending to Port C