Arithmetic an Logic Instruction

In multiplication of two bytes in the 8051, we must place one byte in register ________ and the other in register __________.

• A, B

• R0, R1

• CY, P

• C, R6

In unsigned byte-by-byte multiplication, the product will be placed in register(s) __________.

• A

• B

• C

• R0

In byte/byte division, the numerator must be placed in register_________ and the denominator in register_________.

• R0, R1

• R1, R0

• A, B

• B, A

In unsigned byte/byte division, the quotient will be placed in register_________ and the remainder in register________.

• R0, R1

• R1, R0

• A, B

• B, A

The instruction “ADD A, source” places the sum in __________.

• R0

• A

• R1

• B

If CY = 1, A = 95H, and B = 4FH prior to the execution of “SUBB A,B”, what will be the contents of A after the subtraction?

• 46

• B9

• -70

• 45

Find the contents of register A after the following code in each case:

MOV A,#37H

ANL A,#0CAH

• 12H

• 02H

• 04H

• 14H

XRLing an operand with itself results in _______.

• 00H

• FFH

What is the value of register A after each of the following instructions?

MOV A,#25H

RR A

RR A

RR A

RR A

• 22H

• 25H

• 52H

• 55H

For the following decimal numbers, give the packed BCD representations

15

• 15H

• 0FH

• F0H

• 01H 05H