利用单片机内部资源实现多通道计数器的两种方法

Two methods of realizing multi-channel counter using internal resources of single chip microcomputer

充分利用MCS-51系列单片机内部的已有资源,给出了利用中断系统和并行口扩展多通道计数器的两种方法,能够对较低频率的计数脉冲进行多路检测,成本低,实现简便,解决了单片机内部计数器数目有限的问题。

In the paper, the existing internal resources of serial MCS-51 microcomputer is adopted fully, and two counter methods were presented by introducing the interrupt system and the multi-channel expanded from parallel port. These methods carry out the multiplex detection of low-frequency count pulse, with the low cost and the easy implementation, which solve the problem of the limited number of single chip microcomputer internal counter.