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
12. Device pins XTAL1 and XTAL2 for the 8051 are used for connections to an external oscillator or crystal.
- TRUE
- FALSE
13. An alternate function of port pin P3.4 in the 8051 is:
- Timer 0
- Timer 1
- interrupt 0
- interrupt 1
15. The I/O ports that are used as address and data for external memory are:
- ports 1 and 2
- ports 1 and 3
- ports 0 and 2
- ports 0 and 3
16. The last 96 locations in the internal data memory are reserved for general-purpose data storage and stack.
- TRUE
- FALSE
18. The total external data memory that can be interfaced to the 8051 is:
- 32K
- 64K
- 128K
- 256K
19. Which of the following instructions will load the value 35H into the high byte of timer 0?
- MOV TH0, #35H
- MOV TH0, 35H
- MOV T0, #35H
- MOV T0, 35H
20. Bit-addressable memory locations are:
- 10H through 1FH
- 20H through 2FH
- 30H through 3FH
- 40H through 4FH