AQA GCSE Computer Science My Revision Notes 2e by Steve Cushing

Author:Steve Cushing [Cushing, Steve]
Language: eng
Format: azw3
ISBN: 9781471886607
Publisher: Hodder Education
Published: 2017-03-27T04:00:00+00:00

2 Decode

• The pattern of the opcode is interpreted by the control unit and the appropriate actions are taken by the electronic circuitry of the CPU.

• These actions may include the fetching of operands for the instruction from memory or from the general purpose registers.

Exam tip

Always review your answers. Proofread your answers as much as you can to correct any spelling mistakes and add any extra comments you think are worth mentioning.

3 Increment

• The program counter is incremented.

• The size of the increment will depend upon the length of the instruction in the instruction register. For example, for a 3-byte instruction the PC would be incremented by 3.

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