| 1. | 8051 series of micro controllers are made by which of the following companies? |
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Answer: (d).Both of the mentioned
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| 2. | AT89C2051 has RAM of: |
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Answer: (b).256 bytes
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| 3. | 8051 series has how many 16 bit registers? |
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Answer: (a).2
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| 4. | When 8051 wakes up then 0x00 is loaded to which register? |
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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? |
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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 |
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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? |
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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 |
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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 |
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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? |
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Answer: (c).16 bytes
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