基于VRP的I/O端口地址分析方法

The Analysis about the Formation of I/O Port Address Based on VRP

分析了I/O端口地址在微机和MCU应用系统中的作用以及接口芯片的片选信号如何界定,给端口地址的形成方法—线选法和译码法下了定义。针对目前微机或MCU系统中I/O端口地址的形成并没有形成理论体系的现状,以AT89C51微控制器为例详细阐述了线选法和译码法形成I/O端口地址的过程,分析了8086微机应用系统中8位端口地址与16位端口地址形成与编程的区别,并运用汇编语言结合VRP(Virtual Reality Platform)对其形成的过程进行了仿真。仿真结果表明,在分析范围内的I/O端口地址能得到正确的结果,而不在分析范围内的I/O端口地址则达不到所要求结果。

The role of I/O port address in MCU application system and how to define the chip - select signal are analyzed. The formation methods that the line selection and decoding methods of the port address are de-fined. According to the phenomenon that the I/O port address in microcomputer and M C U systems did not form theory system, the line selection and decoding methods about the formation process of I/O port address are described in detail with AT89C51 MCU. The difference between the 8 - bit port address and the 16 - bit port address in the 8086 micro computer application system is analyzed, and its formation process was simula-ted by using the assembly language and VRP （Virtual Reality Platform） . The simulation results show that the I/O port address in the analysis range could get the correct result and the I/O port address that is not within the scope of the analysis is not up to the required result.