8051 Microcontroller Mcqs

1.
8051 series of micro controllers are made by which of the following companies?

A. Atmel

B. Philips

C. None of the mentioned

D. Both of the mentioned

Answer Discus (0)

2.
AT89C2051 has RAM of:

A. 128 bytes

B. 256 bytes

C. 64 bytes

D. 512 bytes

Answer Discus (0)

3.
8051 series has how many 16 bit registers?

A. 2

B. 3

C. 1

D. 0

Answer Discus (0)

4.
When 8051 wakes up then 0x00 is loaded to which register?

A. DPTR

B. SP

C. PC

D. PSW

Answer Discus (0)

5.
When the micro controller executes some arithmetic operations, then the flag bits of which register are affected?

A. PSW

B. SP

C. DPTR

D. PC

Answer Discus (0)

6.
How is the status of the carry, auxiliary carry and parity flag affected if write instructionMOV A,#9CADD A,#64H

A. CY=0,AC=0,P=0

B. CY=1,AC=1,P=0

C. CY=0,AC=1,P=0

D. CY=1,AC=1,P=1

Answer Discus (0)

7.
How are the bits of the register PSW affected if we select Bank2 of 8051?

A. PSW.5=0 and PSW.4=1

B. PSW.2=0 and PSW.3=1

C. PSW.3=1 and PSW.4=1

D. PSW.3=0 and PSW.4=1

Answer Discus (0)

8.
If we push data onto the stack then the stack pointer

A. Increases with every push

B. Decreases with every push

C. None of the mentioned

D. Both of the mentioned

Answer Discus (0)

9.
On power up, the 8051 uses which RAM locations for register R0- R7

A. 00-2F

B. 00-07

C. 00-7F

D. 00-0F

Answer Discus (0)

10.
How many bytes of bit addressable memory is present in 8051 based micro controllers?

A. 8 bytes

B. 32 bytes

C. 16 bytes

D. 128 bytes

Answer Discus (0)

11.
DJNZ R0,label is how many bit instruction?

A. 2

B. 3

C. 1

D. Cant be determined

Answer Discus (0)

12.
JZ, JNZ, DJNZ, JC, JNC instructions monitor the bits of which register ?

A. DPTR

B. B

C. A

D. PSW

Answer Discus (0)

13.
Calculate the jump code for again and here if code starts at 0000HMOV R1,#0MOV A,#0MOV R0,#25HAGAIN:ADD A,#0ECHJNC HEREHERE: INC R1DJNZ R0,AGAIN MOV R0,AEND

A. F3,02

B. F9,01

C. E9,01

D. E3,02

Answer Discus (0)

14.
When the call instruction is executed the top most element of stack comes out to be

A. The address where stack pointer starts

B. The address next to the call instruction

C. Address of the call instruction

D. Next address of the stack pointer

Answer Discus (0)

15.
LCALL instruction takes

A. 2 bytes

B. 4 bytes

C. 3 bytes

D. 1 byte

Answer Discus (0)

1 2 3 … 9 Next »

General Subjects

Business

8051 Microcontroller Mcqs

Computer MCQS

Sciences MCQS

1. 8051 series of micro controllers are made by which of the following companies?

Answer & Solution

2. AT89C2051 has RAM of:

Answer & Solution

3. 8051 series has how many 16 bit registers?

Answer & Solution

4. When 8051 wakes up then 0x00 is loaded to which register?

Answer & Solution

5. When the micro controller executes some arithmetic operations, then the flag bits of which register are affected?

Answer & Solution

6. How is the status of the carry, auxiliary carry and parity flag affected if write instructionMOV A,#9CADD A,#64H

Answer & Solution

7. How are the bits of the register PSW affected if we select Bank2 of 8051?

Answer & Solution

8. If we push data onto the stack then the stack pointer

Answer & Solution

9. On power up, the 8051 uses which RAM locations for register R0- R7

Answer & Solution

10. How many bytes of bit addressable memory is present in 8051 based micro controllers?

Answer & Solution

11. DJNZ R0,label is how many bit instruction?

Answer & Solution

12. JZ, JNZ, DJNZ, JC, JNC instructions monitor the bits of which register ?

Answer & Solution

13. Calculate the jump code for again and here if code starts at 0000HMOV R1,#0MOV A,#0MOV R0,#25HAGAIN:ADD A,#0ECHJNC HEREHERE: INC R1DJNZ R0,AGAIN MOV R0,AEND

Answer & Solution

14. When the call instruction is executed the top most element of stack comes out to be

Answer & Solution

15. LCALL instruction takes

Answer & Solution

Engineering MCQS

General Subjects MCQS

1.
8051 series of micro controllers are made by which of the following companies?

2.
AT89C2051 has RAM of:

3.
8051 series has how many 16 bit registers?

4.
When 8051 wakes up then 0x00 is loaded to which register?

5.
When the micro controller executes some arithmetic operations, then the flag bits of which register are affected?

6.
How is the status of the carry, auxiliary carry and parity flag affected if write instructionMOV A,#9CADD A,#64H

7.
How are the bits of the register PSW affected if we select Bank2 of 8051?

8.
If we push data onto the stack then the stack pointer

9.
On power up, the 8051 uses which RAM locations for register R0- R7

10.
How many bytes of bit addressable memory is present in 8051 based micro controllers?

11.
DJNZ R0,label is how many bit instruction?

12.
JZ, JNZ, DJNZ, JC, JNC instructions monitor the bits of which register ?

13.
Calculate the jump code for again and here if code starts at 0000HMOV R1,#0MOV A,#0MOV R0,#25HAGAIN:ADD A,#0ECHJNC HEREHERE: INC R1DJNZ R0,AGAIN MOV R0,AEND

14.
When the call instruction is executed the top most element of stack comes out to be

15.
LCALL instruction takes