CHAPTER 4

Question 1

Address Bus

Answer 1

• Address data to be written to the device is carried in address bus

Question 2

Data bus

Answer 2

• All data to be written to the device is carried in data bus

Question 3

Buffer

Answer 3

• Temporary hold data until its ready to transmitted to the device

Question 4

Instruction Group

Answer 4

• INPUT AND OUTPUT
• ARITHMETIC OPERATIONS
• UNCONDITIONAL AND CONDITIONAL INSTRUCTION
• COMPARE INSTRUCTION

Question 5

Handle interrupt

Answer 5

• Raise interrupted flag
• At the end of FE Cycle
• Check priority
• If True , current store at stack
• The interrupt input will be process by ISR
• The content in stack is restored

Question 6

What is an assembler ?

Answer 6

• Translate assembly language into machine language

Question 7

Why use assembly language ?

Answer 7

• Far easier
• Safer ( Careless )
• Reduce time consuming

Question 8

Assembler can be done ?

Answer 8

• Manually
• Automatic by computer programs

Question 9

Basic Assembler

Answer 9

• Take source file , Generate object
• Find and report errors
• Construct a symbol table

Question 10

Addressing mode ?

Answer 10

• Immediate (Operand is the data )
• Direct ( Operand hole memory )
• Indirect ( Operand held memory that store the address of data )
• Indexed

Question 11

First pass

Answer 11

• Read one line at a time
• Ignore comment
• Check opcode
• Generate symbol table

Question 12

Second pass

Answer 12

• Read one line at a time
• Generate object code including opcode , operand from pass 1
• Save or execute the program

Question 13

Control bus signal contain ?

Answer 13

• Interrupt
• Timing
• Read
• Write

Question 14

How to speed up laptop ?

Answer 14

• Logical core - More instruction simultaneously
• Ram - Run many at a time
• Cache - Frequently used
• Clock speed - FE cycle
• Bus width - More data

Question 15

How data transmitted via USB port ?

Answer 15

• 1 byte transferred at a time
• Can be synchronous or not