A. Microcontrollers are normally less expensive than microprocessors. B. The 8051 microcontroller has three on-chip timers. C. Mode 2 of 8051 timer is used to set the baud rate. D. For the LCD to recognize information at the data pins as data, the register select (RS) pin must be set to low. E. A driver must be placed between the micrcontroller and the stepper motor. Choose the correct answer from the options given below:
This solution analyzes each statement to determine the correct combination for the multiple-choice question.
Analyzing Microcontroller vs. Microprocessor Cost
Statement A: Microcontrollers integrate CPU, memory, and I/O peripherals on a single chip, whereas microprocessors typically require external components. This integration generally makes microcontrollers less expensive for specific applications compared to microprocessors.
Result: Statement A is True.
Evaluating 8051 On-Chip Timers
Statement B: The standard 8051 microcontroller architecture includes two on-chip timers/counters (Timer 0 and Timer 1). Some derivatives may have more, but the original 8051 specification has two.
Result: Statement B is False.
Understanding 8051 Timer Mode 2 for Baud Rate
Statement C: Timer Mode 2 in the 8051 is the 8-bit auto-reload mode. This mode is frequently used to generate the precise timing required for setting the baud rate in serial communication, as it automatically reloads a value upon overflow.
Result: Statement C is True.
Interpreting LCD RS Pin Functionality
Statement D: The Register Select (RS) pin on standard character LCDs controls whether the input is interpreted as a command or data. Setting RS to high signifies data, enabling the display of characters. Setting RS to low selects instructions or commands.
Result: Statement D is False.
Assessing Stepper Motor Driver Requirements
Statement E: Stepper motors require specific current levels and controlled switching sequences that standard microcontroller I/O pins cannot directly provide. A dedicated driver circuit (e.g., an H-bridge or specialized IC) is necessary to interface a microcontroller with a stepper motor safely and effectively.
Result: Statement E is True.
Conclusion on Correct Statements
Based on the analysis:
- Statement A is True.
- Statement B is False.
- Statement C is True.
- Statement D is False.
- Statement E is True.
The correct combination includes statements A, C, and E.
Important Questions from Microprocessors and Microcontrollers
Data and address bus width of 8085 microprocessor respectively are
The number of interrupts handled by 8051 microcontroller (other than Reset) is _____.
How many bits are used in the data bus of 8051 ?
16-bit registers consist of:
- The 8051 microcontroller has __________ on-chip RAM and __________ on-chip ROM.
