Page 156 - DCAP210_INTRODUCTION__TO_MICROPROCESSORS

Introduction to Microprocessors

Notes In the early 1980s, HCI was a small and focused specialty area. It was a cabal trying to establish
what was then a heretical view of computing. Today, largely due to the success of that endeavor,
HCI is a vast and multifaceted community, loosely bound by the evolving concept of usability,
and the integrating commitment to value human concerns as the primary consideration in
creating interactive systems.

Questions
1. Describe brief about Human-computer interaction (HCI).
2. What are the concepts of usability of Human-computer interaction (HCI)?

10.5 Summary

• A loop is the procedure which asks the microprocessor to change the sequence of execution
and perform the task repeatedly.
• Counting is technique allows programmer to count how many times the instruction/set of
instructions are executed.
• The unconditional jump instruction creates a continuous loop which can be stopped only
by the resetting of the system.
• ADD and SUB instructions implicitly assume that one of the operand is register.

10.6 Keywords

Counting: Counting is technique allows programmer to count how many times the instruction/
set of instructions are executed.
Looping: Looping is the programming technique used to instruct the microprocessor to repeat
tasks.
Machine code: Machine code or machine language is a system of instructions and data executed
directly by a computer's central processing unit.

Registers: A register, among other definitions, is a record in writing. As a verb it is to record or to
be recorded in an official list.
Rotate instructions: Rotate instructions rotate the Accumulator bits. This group includes four
instructions.

1. Explain the machine code with example.
2. Give the code for looping instruction. Explain.

10.7 Self-Assessment Questions

1. Simple arithmetic operations describes the operations between number or contents of the
microprocessor ………
(a) instruction (b) repeater

(c) register (d) None of these
2. The rotate instruction is related to rotating the bits ………
(a) accumulator (b) register
(c) instruction (d) None of these

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