The 8051 Microcontroller Questions and Answers
The 8051 Microcontroller questions with answers provide a comprehensive overview of microcontroller architecture, instruction sets, and I/O programming. These programming questions and answers are key for embedded systems interviews and ECE placements in companies like TCS, DRDO, and Intel. Each question explores the working principles of timers, interrupts, and serial communication in 8051. Practicing these MCQs enhances your embedded system knowledge and coding efficiency in assembly and C languages.
The 8051 Microcontroller
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59 questions
41. Which of the following commands will copy the contents of location 4H to the accumulator?
- MOV A, 04H
- MOV A, L4
- MOV L4, A
- MOV 04H, A
42. The microcontroller is useful in systems that have nonvariable programs for dedicated applications.
- TRUE
- FALSE
43. The total amount of external code memory that can be interfaced to the 8051 is:
- 32K
- 64K
- 128K
- 256K
46. An alternate function of port pin P3.1 in the 8051 is:
- serial port input
- serial port output
- memory write strobe
- memory read strobe
47. Which of the following instructions will move the contents of the accumulator to register 6?
- MOV 6R, A
- MOV R6, A
- MOV A, 6R
- MOV A, R6
48. The following command will rotate the 8 bits of the accumulator one position to the left: RL A
- TRUE
- FALSE
49. An alternate function of port pin P3.0 (RXD) in the 8051 is:
- serial port input
- serial port output
- memory write strobe
- memory read strobe
50. Analog output current must be converted into a usable voltage. To perform this current-to-voltage conversion a 700 op amp may be used.
- TRUE
- FALSE