MCA Quiz 1

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Which of the following companies manufactures 8051 microcontrollers?

• Atmel
• Philips
• Intel
• All of the mentioned

8051 is a ______________ bit microcontroller

• 8
• 16
• 13
• 4

If an interrupt is generated from hardware, then it is an

• internal interrupt
• external interrupt
• interrupt
• none of the mentioned

If the interrupt is generated by the execution of an interrupt instruction then it is

• internal interrupt
• external interrupt
• interrupt-in-interrupt
• none of the mentioned

RAM holds __________ bytes of storage in 8051.

• 28KB
• 128 KB
• 4 KB
• 12 KB

How are the status of the carry, auxiliary carry and parity flag affected if the write instruction MOV A,#9C ADD A,#64H

• CY=0, AC=0, P=0
• CY=1, AC=1, P=0
• CY=0, AC=1, P=0
• CY=1, AC=1, P=1

If we push data onto the stack then the stack pointer

• increases with every push
• decreases with every push
• increases & decreases with every push
• none of the mentioned

The type of the interrupt may be passed to the interrupt structure of CPU from

• interrupt service routine
• stack
• interrupt controller
• none of the mentioned