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 |
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Answer: (d).Both of the mentioned
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2. | AT89C2051 has RAM of: |
a. | 128 bytes |
b. | 256 bytes |
c. | 64 bytes |
d. | 512 bytes |
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Answer: (b).256 bytes
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3. | 8051 series has how many 16 bit registers? |
a. | 2 |
b. | 3 |
c. | 1 |
d. | 0 |
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Answer: (a).2
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4. | When 8051 wakes up then 0x00 is loaded to which register? |
a. | DPTR |
b. | SP |
c. | PC |
d. | PSW |
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Answer: (c).PC
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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 |
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Answer: (a).PSW
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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 |
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Answer: (b).CY=1,AC=1,P=0
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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 |
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Answer: (d).PSW.3=0 and PSW.4=1
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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 |
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Answer: (a).increases with every push
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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 |
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Answer: (b).00-07
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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 |
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Answer: (c).16 bytes
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