CAES Lab Viva 1 Batch 1

What is the results of the following DIV AB; A=77H;B=34H 

• A=02H;B=15H

• A=02H;B=00H 

• A=02H;B=FFH

• A=02H;B=0FH 

In “JZ NEXT”, which registers content is checked to see if it is zero? 

• PROGRAM COUNTER

• CARRY

• REGISTER A 

• AUXILIARY CARRY 

The mnemonic JNZ stands for _____________ 

• Jump while Not zero 

• Jump on zero

• Jump is Non-zero

• Jump if Not zero

Every 8051 family member wakes up at address when it is powered up. 

• 1000H

• 0000H

• 30H

• 9000H

8051 is a ..........bit microcontroller. 

• 12

• 16

• 8

• 4

How many pins are available in 8051 IC 

• 20

• 50

• 30

• 40

MOV R0,#30H

MOV A,@R0

MOV B,A

JZ L1

MUL AB

INC R0

MOV @R0,A

SJMP L2

L1:INC R0

MOV A,#0FFH

MOV @R0,A

L2:NOP

L3:SJMP L3

What is the hexcode of L2, if the starting address is 9000H?

• 04h

• 05h

• FEh

• 03h

Which register is used for accessing external memory? 

• STACK POINTER

• R0-R7 

• DATA POINTER 

• ACCUMULATOR

Find the CY and AC flags for the below instruction. MOV A, #99H 

ADD A, #68H 

• A=0101H

• CY=1, AC=0 

• CY=1, AC=1 

• CY=0, AC=1 

 Registers A and B are......... bits wide. 

• 4

• 16

• 12

• 8