论文部分内容阅读
为了解决MCS-51单片机应用系统设计需要对单片机P0口进行适当的扩展的问题,文中给出了一种使用输出带锁存的74HC377芯片来进行输出口扩展,并使用具有三态缓冲的74HC244芯片进行输入口扩展的并行扩展方法。同时给出了具体的电路连接和部分汇编代码。
In order to solve the MCS-51 single-chip microcomputer application system design needs of the microcontroller port P0 appropriate expansion of the problem, the paper gives a use of the output latch 74HC377 chip for output expansion, and the use of a tri-state buffer 74HC244 chip Parallel expansion of input port expansion method. Also gives the specific circuit connection and part of the assembly code.