A part of a processor which executes some instructions and generates operand addresses and instruction requests. It also controls the sequencing of instructions through the machine and is usually controlled by microcode.; 處理器的一部分,它執(zhí)行某些指令并生成操作數(shù)地址和指令請求,它還控制通過機(jī)器的 指令順序。通常由微碼來控制。