BCA Semester 2 – Microprocessor and Comp. Architecture – Unit 4: Microprogrammed Control (10Hrs)

Question 1

Explain the organization of Microprogrammed Control Unit.

Marks: 5

Year: 2019 Final TU FOHSS

1. Introduction A Microprogrammed Control Unit generates control signals using a set of microinstructions stored in a special memory called Control Memory. Instead of hardwired circuits, it uses sof

Question 2

Define control word. Explain the procedure for generating control word for specific operation.

Marks: 5

Year: 2019 Final TU FOHSS

1. Definition of Control Word A control word is a binary code (a set of control bits) that specifies all the micro-operations to be performed in one clock cycle of the CPU. - It activates different pa

Question 3

Explain the design and control logic of Accumulator.

Marks: 10

Year: 2019 Final TU FOHSS

1. Introduction The Accumulator (A-register) is the most important register in the 8085 and most microprocessors. It is an 8-bit register used to store one of the operands and hold the final result

Question 4

Explain the organization of Microprogrammed Control Unit.

Marks: 5

Year: 2020 Final TU FOHSS

A Microprogrammed Control Unit generates control signals using a set of microinstructions stored in a special memory called Control Memory (CM). Instead of hardwired circuits, it uses microprograms

Question 5

Define micro-program? Describe symbolic micro-program for instruction FETCH routine. Explain the organization of micro-program sequencer for control memory with suitable diagram.

Marks: 10

Year: 2020 Final TU FOHSS

1. Definition of Microprogram A microprogram is a sequence of microinstructions stored in the control memory that defines the control signals for executing each machine-level instruction in a CPU. K

Question 6

What do you mean by instruction mapping? Explain how to convert an instruction code to a microinstruction address.

Marks: 5

Year: 2021 Final TU FOHSS

1. Definition of Instruction Mapping Instruction Mapping is the process of associating each machine-level instruction (opcode) with a corresponding sequence of microinstructions stored in the control

Question 7

What is microprogram sequencer? Differentiate between hardwired control unit and microprogrammed control unit.

Marks: 5

Year: 2022 Final TU FOHSS

1. Microprogram Sequencer Definition: A Microprogram Sequencer is a part of a microprogrammed control unit that generates the addresses of microinstructions stored in the control memory. It sequen

Question 8

Define symbolic microprogram. You have a list of data stored at memory location starting at 8050H. The end of the data array is indicated by data byte 00H. Write a program to add the set of readings.

Marks: 10

Year: 2022 Final TU FOHSS

1. Definition of Symbolic Microprogram Symbolic Microprogram: - A sequence of microinstructions written in symbolic form (mnemonics) to control CPU operations. - Each microinstruction corresponds

Question 9

Explain Symbolic Microinstruction and microinstruction format.

Marks: 5

Year: 2023 Final TU FOHSS

1. Symbolic Microinstruction Definition: A symbolic microinstruction is a human-readable representation of microinstructions that control CPU operations at the hardware level. Key Points: - Each

Question 10

Explain the steps of Address Sequencing in detail. Draw and explain selection of address for control memory.

Marks: 10

Year: 2023 Final TU FOHSS

1. Address Sequencing Definition: - Address sequencing is the process of selecting the next microinstruction address in a microprogrammed control unit. - Ensures correct execution sequence of micr