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在上一讲中我们曾设想了一个简化了的计算机模型用来说明微型机系统的基本原理。在指令执行的时候常常需要数据。这数据通常可以在某个存储单元内找到,或者,它立即跟在指令码之后。在计算机中,一条指令通常包括二部分:第一部分是操作码或称指令码,它指
In the previous lecture, we have envisaged a simplified computer model to illustrate the basic principles of the microcomputer system. Often need data when the instruction is executed. This data can usually be found in a memory location, or it can be immediately followed by the instruction code. In a computer, an instruction usually consists of two parts: The first part is the operation code or instruction code, which means