The arithmetic logic unit; ALU, Control Unit and Registers (Program Counter; PC, Accumulator; ACC,
Memory Address Register; MAR, Memory Data Register; MDR, Current Instruction Register; CIR).
Structure and function of the processor
1. Pair these acronyms with their names and descriptions. Use a line connector shape to join them together.
2. Colour-code them: red – fetch, green – decode, blue – execute.
PC
MAR
MDR
CIR
ACC
Memory Address
Register
Current Instruction
Register
Program Counter
Accumulator
Memory Data Register
Stores data read from or being written to RAM
Stores the instruction currently being executed
Stores the result of calculations from the ALU
Stores the address of the instruction or data to be
fetched
Stores the address of the next instruction to be
fetched
