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GTU Electronics and Communication Engineering (Semester 5)
Microcontroller And Interfacing
June 2014
Microcontroller And Interfacing
June 2014
1 (a)
Explain the 8051 architecture with block diagram.
7 M
1 (b)
Explain following instructions of 51 family microcontroller
(1) CJNE reg,#data
(2) DEC A
(3) RRC A
(4) DEC @R0
(5) ADDC A,R7
(6) SETB C
(7) ANL C,bit.
(1) CJNE reg,#data
(2) DEC A
(3) RRC A
(4) DEC @R0
(5) ADDC A,R7
(6) SETB C
(7) ANL C,bit.
7 M
2 (a)
Explain Serial data transmission modes in detail.
7 M
2 (b)
Explain functions of following pins in 51 family microcontroller
(1) PSEN (2) EA(3) ALE (4) RST (5) TxD (6) TI (7) WR
(1) PSEN (2) EA(3) ALE (4) RST (5) TxD (6) TI (7) WR
7 M
2 (c)
What are the interrupts available in the 8051 microcontroller? Explain interrupt enable
(IE) SFR and Interrupt priority (IP) SFR.
7 M
3 (a)
Explain various modes of timers in 8051 and explain with assembly language
programming auto reload mode.
7 M
3 (b)
Write an assembly program to find frequency of signal connected at P3.4.
Assume XTAL = 12MHz. Use Timer 0 as a counter, and Timer 1 as time base of 1 sec.
7 M
3 (c)
Write a C program using interrupts to do the following:
(i) Generate a 2000 Hz frequency on P2.1 using T0 8 bit auto reload,
(ii) The pulse train is connected to P3.5. Use timer 1 as an event counter to count up a 1- Hz pulse and display it on P0.
Assume that XTAL=12 MHz.
(i) Generate a 2000 Hz frequency on P2.1 using T0 8 bit auto reload,
(ii) The pulse train is connected to P3.5. Use timer 1 as an event counter to count up a 1- Hz pulse and display it on P0.
Assume that XTAL=12 MHz.
7 M
3 (d)
Write an 8051 C program to calculate the checksum bye for given data. Six bytes of
hexadecimal data: AAh, 72h, 3Ah, and 1Fh,45h,Cdh.
7 M
4 (a)
With interfacing diagram explain seven segment interfacing with 8051 and write a
program to display 0 to 9 with appropriate delay between the display of the subsequent
Digits.
7 M
4 (b)
Write an assembly as well as C program to transfer the message "ELECTION" serially at
2400 buad, 8-bit data, 1 stop bit. Perform this program for 25 times.
7 M
4 (c)
Explain with necessary sketch, interfacing the LCD with 8051 and write a C program to
Display "WELCOME" in the first line and in centre of the 16×2 line display.
7 M
4 (d)
Explain interfacing of RTC with 8051 microcontroller. Write program to get values of
hour, minute and second from RTC to RAM locations 60h, 61h and 62h respectively.
7 M
5 (a)
Explain interfacing of External 16K EPROM and 16K RAM with 8051. Draw circuit
Diagram
7 M
5 (b)
Write a program to interface a unipolar stepper motor, by 64° in clockwise direction.
Assume the motor has a step angle of 2°. Use the 4-step sequence.
7 M
5 (c)
Write a program for speed control of DC motor using PWM.
7 M
5 (d)
Explain 8051 interfacing with ADC 0804 in self clocking mode.
7 M
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