Microcontroller and Embedded Systems

Q.1. (a) Write the basic characteristics for a CPU to be classified as a micro-controller. [4]

(b) Explain the following SFR's: (i) PSW (ii) IE. [6]

(c) Explain RAM structure of 8051 micro-controller. [6]

Q.1. (a) Explain the pin diagram of 8051 micro-controller. [8]

(b) Explain the bit format of TMOD and TCON registers of 8051 microcontroller. [8]

Q.2. (a) Why are the PUSH and POP important instructions when servicing the number of interrupt sources by their interrupt service routines? [8]

(b) Differentiate between the following: (i) LCALL & ACALL (ii) SJMP & LJMP. [4]

(c) Find the time delay for the following subroutine, assuming a crystal frequency of 11.0592 MHz - DELAY: MOV R3,#250 ; HERE: NOP ; NOP ; NOP ; NOP ; DJNZ R3,HERE ; RET. [4]

Q.2. (a) What are the addressing modes of 8051 micro-controller? Explain all addressing modes with an example. [8]

(b) Explain how will 8051 micro-controller communicate the data on the common TXD and RXD lines in the inter-processor communication mode. [8]

Q.3. (a) Explain interrupt structure of 8051 micro-controller in detail. [8]

(b) Calculate the largest possible time delay for a timer in mode 1 if a 6 megahertz crystal is used. [4]

(c) Describe the concepts of interrupt intervals and interrupt density. [4]

Q.3. (a) Assuming that XTAL = 11.0592 MHz, write a program to generate a square wave of 2 kHz frequency on pin P1.5. [6]

(b) How many interrupts are there in 8051? What is the default priority of the interrupts? [6]

(c) Write the function of the individual bits of the IE register. [4]

Q.4. (a) Compare serial I/O interface and parallel I/O interface with suitable example. [10]

(b) Draw the circuit of LED interface with 8051 micro-controller. [6]

Q.4. (a) Explain digital and analog interfacing methods in detail and compare them. [12]

(b) What is the difference between Synchronous and Asynchronous serial communication? [4]

Q.5. (a) What do you mean by multi-tasking system? Explain with suitable example. [8]

(b) What is Scheduling? Explain Round Robin Scheduling. [8]

Q.5. (a) What is Real Time Operating System? Explain the basic features of commercial RTOS. [8]

(b) Explain the architecture and requirements for development process of embedded system. [8]