Microcontrollers and PLC — Winter 2024

Explain difference between microprocessor and microcontroller.

Explain EQU & DB assembler directives of 8051 microcontroller.

Write operation of the following instructions 1] SWAP A [2] MOVX A,@DPTR [3] DIV AB [4] RR A [5] XCHD A,R1 [6] MOVC A,@A+DPTR 7) MOV A,30H

List the factors to be considered for selection of microcontroller for application.

Differentiate between Control and Conditional flag. Explain flag register of 8051 microcontroller.

List different addressing modes of programing instruction of 8051 microprocessor. Also explain them with a suitable example.

Draw and explain internal memory organization of 8051 microcontroller.

Describe the functions of following 8051 pins. (i) XTAL1 (ii) ALE (iii) RxD

Discuss PUSH and POP Instruction.

Explain PC and DPTR with their significance. Write program to interchange contents of PC and DPTR.

Describe each bit of 8051 microcontroller PSW (flag) register.

Write difference between ACALL and LCALL instruction with example.

Write a program to transfer block of 10 data from internal memory locations to External memory locations for 8051 controller.

Describe TMOD Special Function registers.

List out 8051 interrupts with their ROM location.

Interface a seven segment common cathode display with microcontroller 8051. Write an ALP to display numbers from 0 to 9 at every second.

Develop a ladder diagram for AND & EX -OR Logic gates.

Draw the block diagram of PLC.

Draw SFC and ladder diagram for traffic light sequence operation.

Describe the Input Module block diagram.

Explain the various programming languages in PLC.

Write a PLC ladder logic equivalent for NAND and NOR as universal gates.

Explain the ON-Delay timer.

Develop ladder diagram for 4 to 1 Multiplexer.

Describe the various types of Jump instructions.