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GCSE Computer Science · key term
A register that holds the memory address of the next instruction to be fetched.
Used by OCR
Paper 1
Revise: CPU Components and FunctionsSimilarly, the PC holds the address of the next instruction, not the instruction itself. The ACC holds a calculation result, not the address of where that result might later be stored.
The CPU register that holds the memory address of the next instruction to be fetched.
For a register question, state both its purpose and what it stores. PC and MAR store addresses; MDR and ACC store contents rather than addresses.
Distinguish an address from its contents: the MAR and PC hold addresses; the MDR holds transferred data or instructions.
Describe the PC as holding the address of the next instruction, not the instruction itself.
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