Lecture3：Principles of general-purpose computer 曹振飞 2015050539

Lecture3：Principles of general-purpose computer

曹振飞 2015050539

1. 
   Why should we learn this course?
   

Also,we learn what is instruction in computer as well as a program in C language.In all,what our teacher mainly want to tell us is the functions of the genera-purpose computer.

2. 
   Binary System
   

• 
  Evey two-state physical system can represent 0,1.
  
• 
  How to compute in binary.
  

1 means True.0 means False.And,Or,Not can be used in the Binary System.

~Two Examples:

• 
  1 bit multiplication:Just AND gate
  
• 
  1 bit summation(without carry),or Xor.
  
• 
  All computation can be realized using AND,Or,Not.
  

3. 
   What is Program?
   

• 
  Program is a sequence of instruction
  
• 
  One program to cope with all possible inputs
  

(2) address of date:date is stored in that address(Adress:Like variable in algebra.E.g.f(n)=n!)

Example: Motivating example:314*72 we learn last week.

Example： A B C

* D E

F G H

L M N O

2.B*E=G

4.D*C=K

6.D*A=I

8.G+K→N

10.I→L

4. 
   Instruction
   

• 
  OP Code
  
• 
  Operand
  
• 
  Instruction is represented by Binary System
  

- An instruction set is a collection of preprogrammed activities a microprocessor is hardwired to perform

- Addition,Multiplication table

- Store the memory.

- The ALU uses registers (a kind of memory) to hold data that is being processed

- The microprocessor’s control unit fetches each instruction.

- The term instruction cycle refers to the process in which a computer executes a single instruction.