| 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 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (d).Both of the mentioned
|
| 2. | AT89C2051 has RAM of: |
| a. | 128 bytes |
| b. | 256 bytes |
| c. | 64 bytes |
| d. | 512 bytes |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (b).256 bytes
|
| 3. | 8051 series has how many 16 bit registers? |
| a. | 2 |
| b. | 3 |
| c. | 1 |
| d. | 0 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (a).2
|
| 4. | When 8051 wakes up then 0x00 is loaded to which register? |
| a. | DPTR |
| b. | SP |
| c. | PC |
| d. | PSW |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (c).PC
|
| 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 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (a).PSW
|
| 6. | How is the status of the carry, auxiliary carry and parity flag affected if write instruction MOV A,#9C ADD 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 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (b).CY=1,AC=1,P=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 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (d).PSW.3=0 and PSW.4=1
|
| 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 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (a).increases with every push
|
| 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 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (b).00-07
|
| 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 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (c).16 bytes
|
