8051 Architecture & Instruction Set

What are the four register banks in the 8051 architecture?

• Bank B

• Bank C

• Bank 0, Bank 1, Bank 2, Bank 3

• Bank A

Explain the SFRs (Special Function Registers) in the 8051 microcontroller.

• SFRs in the 8051 microcontroller are related to audio processing

• SFRs in the 8051 microcontroller are responsible for memory allocation

• SFRs in the 8051 microcontroller are used for temperature control

• SFRs in the 8051 microcontroller are memory-mapped registers that control various functions like I/O operations, timer/counters, serial communication, and interrupt control.

How is the memory organized in the 8051 microcontroller?

• Memory in the 8051 microcontroller is organized into 3 banks, with Bank 0 containing the lower 128 bytes of RAM and SFRs, while Banks 1 and 2 hold the upper 128 bytes of RAM.

• Memory in the 8051 microcontroller is organized into 4 banks, with Bank 0 containing the lower 128 bytes of RAM and SFRs, while Banks 1, 2, and 3 hold the upper 128 bytes of RAM.

• Memory in the 8051 microcontroller is organized into 2 banks, with Bank 0 containing the upper 128 bytes of RAM and SFRs, while Bank 1 holds the lower 128 bytes of RAM.

• Memory in the 8051 microcontroller is organized into 4 banks, with Bank 0 containing the upper 128 bytes of RAM and SFRs, while Banks 1, 2, and 3 hold the lower 128 bytes of RAM.

What is the size of the internal RAM in the 8051 microcontroller?

• 64 bytes

• 256 bytes

• 128 bytes

• 512 bytes

Describe the instruction set of the 8051 microcontroller.

• XCH

• INC

• DIV

• MUL

• The instruction set of the 8051 microcontroller includes operations like MOV, ADD, SUBB, CJNE, JUMP, etc.

What are the different addressing modes supported by the 8051 microcontroller?

• Immediate, Register, Direct, Indirect, Indexed, Register Indirect

• Register Immediate

• Direct Indexed

• Immediate Indirect

How does the 8051 microcontroller handle interrupts?

• The 8051 microcontroller handles interrupts by using interrupt vectors and pushing the program counter onto the stack.

• The 8051 microcontroller handles interrupts by shutting down the system.

• The 8051 microcontroller handles interrupts by executing a random instruction.

• The 8051 microcontroller handles interrupts by ignoring them completely.

Explain the concept of priority levels in interrupt handling for the 8051 microcontroller.

• Priority levels in interrupt handling for the 8051 microcontroller are randomly assigned

• The 8051 microcontroller has only 2 interrupt priority levels

• Priority levels in interrupt handling for the 8051 microcontroller determine the order in which interrupts are serviced. The 8051 has 5 interrupt priority levels, where level 0 is the highest priority and level 4 is the lowest. When multiple interrupts occur simultaneously, the interrupt with the highest priority level will be serviced first.

• Interrupts with lower priority levels are serviced first in the 8051 microcontroller

What are the I/O ports available in the 8051 microcontroller?

• P4, P5, P6, P7

• P0, P1, P2, P3

• A0, A1, A2, A3

• S0, S1, S2, S3

How many I/O ports does the 8051 microcontroller have?

• 4

• 8

• 2

• 6