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(1) 指令类别: Z-80CPU共有158条指令,按功能可分为8类,现分类介绍如下。 A.取数和交换取数指令用于在CPU内部寄存器之间或CPU寄存器和存储器之间传送数据。指令规定取出数据的源地址和存放数据的目标地址,取数指令不改变源存储单元的内容。交换指令可以交换或成组交换寄存器内容。 B.数组传送和检索这是Z-80独特的一组指令。它用一条指令就能把任意个字节的一组数据从存储器的一
(1) Instruction categories: Z-80CPU a total of 158 instructions, according to the function can be divided into 8 categories, are classified as follows. A. Fetch and Swap Fetch instructions are used to transfer data between CPU internal registers or between CPU registers and memory. The instruction specifies the source address of the data to be fetched and the destination address where the data is to be stored. The fetch instruction does not change the contents of the source memory location. Swap instructions exchange or group register contents. B. Array Transfer and Retrieval This is a unique set of instructions for the Z-80. It uses a single instruction to store an arbitrary number of bytes of data from memory