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VTU Electronics and Communication Engineering (Semester 4)
Microcontroller for Embedded Systems
June 2012
Microcontroller for Embedded Systems
June 2012
1 (a)
Explain briefly the Harvard and Von-Neumann CPU architecture.
6 M
1 (b)
Sketch the internal block schematic of 8051, list its salient features and briefly explain its register set.
10 M
1 (c)
Briefly explain the dual functions of port-3 pins of 8051.
4 M
2 (a)
Briefly explain any four addressing modes of data of 8051 with an example for each.
6 M
2 (b)
Explain the operations of the 8051 instructions:
i) RLC A
ii) DA A
iii) MUL AB and
AJMP addr
i) RLC A
ii) DA A
iii) MUL AB and
AJMP addr
8 M
2 (c)
Write an ALP (assembly language program) in 8051 to count the number of positive and negative numbers present in the internal memory block starting with the address 20H, containing N byte, Store the counts after the last data byte in the memory block.
6 M
3 (a)
Briefly explain the different assembler directives used in an assembly language program.
4 M
3 (b)
Write an 8051 ALP to find the value of NI/RI using a subroutine that calculates the the factorial of a given number. Assume the values of N and R are stored in locations 10H and 11H. Store the value of NI/RI in 12H. Assume NI?RI and NI/RI are all maximum 8 bit values.
10 M
3 (c)
Write an 8051 software time delay subroutine to generate a time delay of 100 μsec when called. Assume crystal frequency as 12 MHz. Show delay calculations. Do not use timers.
6 M
4 (a)
Interface an LCD display unit to 8051 and write an ALP to display the message 'DONE'.
10 M
4 (b)
Interface a stepper motor to 8051and rotate it by checking the statue of a simple toggle switch connected to pin P2.0 as follows:
i) If switch is open rotate motor in clock wise direction.
ii) If switch is closed rotate motor in counter clockwise direction.
i) If switch is open rotate motor in clock wise direction.
ii) If switch is closed rotate motor in counter clockwise direction.
10 M
5 (a)
With regard to the interrupt of 8051.
i) Give the vector address of the interrupts.
ii) Briefly explain the procedure of enabling / disabling the entire interrupt system and enabling / disabling of individual interrupts.
iii) Indicate the default priority on reset and procedure to alter this default priority.
i) Give the vector address of the interrupts.
ii) Briefly explain the procedure of enabling / disabling the entire interrupt system and enabling / disabling of individual interrupts.
iii) Indicate the default priority on reset and procedure to alter this default priority.
6 M
5 (b)
With regard to timer of 8051,
i) Explain briefly the difference between the timer and counter operation modes.
ii) Indicate how to start / stop the timer if GATE control is also used.
iii) Explain mode -2 operation.
i) Explain briefly the difference between the timer and counter operation modes.
ii) Indicate how to start / stop the timer if GATE control is also used.
iii) Explain mode -2 operation.
6 M
5 (c)
Write an ALP in 8051 to generate a square wave of frequency 5 kHz on pin P2.7 using Timer-I in interrupt mode. Assume crystal frequency as 11.0592 MHz.
8 M
6 (a)
i) Explain briefly the asynchronous serial communication format.
ii) Indicate steps of programming 8051 to transmit a character and receive a character serially.
ii) Indicate steps of programming 8051 to transmit a character and receive a character serially.
9 M
6 (b)
Write a 8051 C program to transmit the character '*' continuously serially in the 8 bit, I start bit, 1 stop bit, 2400 baud rate format. Assume the crystal frequency as 11.0592 MHz.
8 M
6 (c)
What is the advantages of using the chip 8255 with 8051? Indicate the functions of the pins A0 and A1 of 8255.
3 M
7 (a)
Explain the architecture of MSP430 with its internal block schematic
10 M
7 (b)
Give the details of memory map of MSP430.
6 M
7 (c)
Write a note on block system of MSP430.
4 M
8 (a)
Write an assembly program to generate a waveform with ON time of 7msec and OFF time of 21 msec on P0.5. Assume XTAL of 11.0592 MHz. Use timer 0.
12 M
8 (b)
Explain the bits of SOON register.
8 M
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