1.1.1 Structure and function of the processor

1.1.1 Structure and function of the processor

1. 1.1.1a

   • Register - Small piece of memory located within the processor.
   • The Arithmetic and Logic Unit (ALU) - Carries out calculations and logical instructions
   • Control Unit (CU) – Decodes instructions and sends out control signals
   • Program Counter (PC) - stores the address of the next instruction
   • Accumulator (ACC) - Temporary storage for data being processed
   • Memory Address Register (MAR) - Contents of the PC are copied here in order for the processor to access the next instruction
   • Memory Data Register (MDR) - Contains the instruction or data which has been accessed from memory
   • Current Instruction Register (CIR) - Contains the address of the instruction or data to be accessed in memory