出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/05/23 03:00 UTC 版)
The program counter, or PC (also called the instruction pointer to a seminal Intel instruction set, such as the 8080 or 4004, or instruction address register, or just part of the instruction sequencer in some computers) is a processor register that indicates where the computer is in its instruction sequence. Depending on the details of the particular computer, the PC holds either the address of the instruction being executed, or the address of the next instruction to be executed.