SLR1-1.1: Structure and function of the processor

• Input devices • Output devices • CPU • Main memory (RAM)

1) Mouse 2) Keyboard

1) Screen 2) Speakers

*Decodes instructions * Sends control signals to coordinate the movement of data through the processor * Sends control signals to execute them * Coordinates buses

• Holds the address of the next instruction • Sends it to MAR • Then increments (or jumps to new address from CIR)

• Holds the address from the Program Counter (PC) or Current Instruction Register (CIR) • Sends it to memory to access data/instructions

*Temporarily stores fetched data/instructions * Acts as a buffer * Sends the instruction to the Current Instruction Register (CIR)

*Holds the current instruction being executed *The contents of the MDR are copied to the CIR if it is an instruction * Contains the opcode and operand of the current instruction

• Performs arithmetic and logical operations and calculations on the data

• Temporarily stores results of calculations • General purpose register of the CPU • Data or control information is stored here

• Data bus • Address Bus • Control Bus

• Carries data between processor components • Allows movement of values within the system

• Carries addresses of data/instructions • Specifies where to read from or write to in memory

• Sends control signals from the Control Unit (CU) to other parts of the processor

It is a language that has one-to-one relationships with the processor architecture

Assembly code