CAES Viva 1 Batch 2

Like Assembly language, Machine language is a.............level language.

• HIGH

   

• MEDIUM

• LOW

• HYBRID

Which register is used for accessing external memory? 

• R0-R7

• ACCUMULATOR

• STACK POINTER  

• DATA POINTER 

3. In multiplication of two bytes in the 8051, we must place one byte in register ___________ 

and the other one in register ______________ 

• ACCUMULATOR AND REGISTER A

   

• REGISTER A AND REGISTER B 

• REGISTER B AND REGISTER R0

• REGISTER A AND REGISTER R0 

Which is the correct instruction ?

• MUL A,R1

• MUL A, B 

• MUL AB

• MUL A,R0

5. Find the CY and AC flags for the below instruction.

6. MOV A, #3FH 

ADD A, #45H 

• A=84H

• CY=0, AC=1 

• CY=0, AC=0

• CY=1,AC=1 

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

• 16

• 20

• 4

• 8

Which of the following instructions are illegal in 8051? 

• MOV A, #50H

• MOV R9, #50H

• MOV A, #FFH

   

• MOV R3, #500H 

11. MOV A, #00H 

MOV R2, #0AH

L2: ADD A, #03H

DJNZ R2, L2

MOV R5, A 

L1: SJMP L1 

Find the Hex code address of the 5th instruction. The starting address is 9000H. 

• 9008H

• 9006H

• 9007H

• 9005H

Which company manufacture microcontrollers that we use in lab?

• ATMEGA

• KEIL

• MICROCHIP

• ATMEL

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

• 4

• 16

• 8

• 32