1.1

What are the main CPU components?

• Arithmetic logic unit

• Control unit

• Registers

  • Program counter

  • Accumulator

  • Memory address register

  • Memory data register

  • Current instruction register

What does the ALU do?

Performs logical operations and bitewise calculations

What does the control unit do?

Decodes instructions and controls how data is moved around the CPU

What does the program counter do?

Stores the address in memory of the next instructions

What does the accumulator do?

Stores temporary values after calculation or inputs

What does the MAR do?

Stores the address of the location that data is being sent/fetched

What does the MDR do?

Stores the current instruction/data

What does the CIR do?

Splits instructions into opcode and operand after it fetched from memory

What makes up the ALU?

• Arithmetic circuit

• Logic circuit

• Registers

• Status flags

• Buses

What are the three buses?

• Data bus

• Address bus

• Control bus