The instructions include arithmetic, logical, data handling, and program control instructions. A memory address is specified as part of a memory reference instruction. The contents of this memory address are used by the processor in executing the instruction.; 包括算术指令、逻辑指令、数据处理指令和程序控制指令等一类与存储器有关的指 令。存储器地址作为存储器访问指令的一部分,在执行此指令时,处理机要用该存储器地址的 内容。