CPU registers Flashcards
1
Q
PC
A
(program counter) Holds the address of the next instruction to be executed
2
Q
MAR
A
(memory address register) Holds the address of the memory location to be read from/written to
3
Q
MDR
A
(memory data register) holds the data that has been fetched from memory or about to be written to memory
4
Q
CIR
A
(current instruction register) Holds the current instruction that is being executed
5
Q
ACC
A
(accumulator) Holds the result of the calculation from the ALU