Lesson Instructions

Watch and follow the YouTube video, the lesson contains three parts:

  1. Key Information and content - all you need to do here is watch and listen

  2. Learning activity - this activity is a labelling and explaining the different CPU components and registers

  3. Consolidation - these are past exam question and are for deliberate practice to check your understanding.

Task - Label the CPU

Task - Exam Questions - Deliberate Practice

Exam Questions - CPU

Mark Scheme

Question 1

Any one point:

  • To carry out the processing on the computer

  • To fetch and execute instructions

"control" the computer is too vague

Question 2

1 mark per bullet to max 2 per register

  • MAR / Memory Address Register

  • Stores the address / location where data will be read/written/accessed/fetched

  • MDR / Memory Data Register

  • Stores the data/instruction that is fetched/read from memory

  • Program Counter

  • Stores the address/location of the next instruction to be run

  • Accumulator

  • Stores the result of manipulation / process / calculation

  • CIR / Current Instruction Register

  • Stores the instruction currently being processed

Question 3

1 mark for each

  • An instruction is fetched from memory

  • The instruction is then decoded

  • The decoded instruction is then executed so that the CPU performs continuously

  • The process is repeated

  • The program counter is incremented

  • The instruction is transferred to the MDR

  • The address of the instruction to be fetched is placed in the MAR